Print Page | Close Window

Do you know this Project from Beyma ?

Printed From: Speakerplans.com
Category: Plans
Forum Name: Other plans
Forum Description: Discussion / Questions about all the other plans
URL: https://forum.speakerplans.com/forum_posts.asp?TID=28315
Printed Date: 28 March 2024 at 5:05pm
Software Version: Web Wiz Forums 12.06 - https://www.webwizforums.com


Topic: Do you know this Project from Beyma ?
Posted By: KenTech
Subject: Do you know this Project from Beyma ?
Date Posted: 30 June 2009 at 9:47pm
Hi everyone.
I;ve discovered a project from Beyma. SB15-1
http://www.prescomaudio.com/webadmin/documents/15p80nd_subbass.pdf
But, i don't know this data...

I want to build 2 cabs. Those missing data are stoping me to do that. Can u help me ? anybody...



Replies:
Posted By: Ibex
Date Posted: 30 June 2009 at 10:01pm
Maybe this could help you...

Beyma SB-15

Do you have an equipment to measure the cabs when you have finished them? Would be interesting to me!
THX!
greez


Posted By: KenTech
Date Posted: 30 June 2009 at 11:02pm
thanx a lot mate !! to measure what ? Frecvency response ? weight ? dimensions ? what ?


Posted By: space-face
Date Posted: 01 July 2009 at 2:28am
Looks good not really seen anything like it before. Would be interested in hearing a few. It's like a tapped horn but with a compression chamber... I guess that would make it act more like a scoop but the driver is way down the horn mouth. hmmm


Posted By: Ibex
Date Posted: 01 July 2009 at 6:56am
Originally posted by space-face space-face wrote:

Looks good not really seen anything like it before. Would be interested in hearing a few. It's like a tapped horn but with a compression chamber... I guess that would make it act more like a scoop but the driver is way down the horn mouth. hmmm
 
By now there exist a lot of thess design. Most name it bass-hybrid, some also say ARLS (advanced reflex tuned sub)... the design works more like a reflex cab, because of the relativ big chamber, but it also bears resemblance to a tapped horn, which can be recognized with its two peaks in the frequency response, cause the driver is mounted inside the hornloaded reflex port. this design has a better effiency than a conventional reflex loaded one.
 
Beyma SB15-1 vs. SB18-1 - SPL
black = Beyma SB18-1 - 18P1200Nd
grey = Beyma SB15-1 - 15P1200Nd


Posted By: Ibex
Date Posted: 01 July 2009 at 6:59am
Originally posted by KenTech KenTech wrote:

thanx a lot mate !! to measure what ? Frecvency response ? weight ? dimensions ? what ?
 
chum, the frequency response! wich driver will you use in this cab?
greez


Posted By: KenTech
Date Posted: 01 July 2009 at 8:13am
i'm thinking of Paudio's SD15 if i have the money i need. If i don't, maybe i will try SM115K from beyma, or Selenium 15PW6.
does anyone have the database for Horn resp  for this Enclosure ?
10x


Posted By: Ibex
Date Posted: 01 July 2009 at 8:20am
Originally posted by KenTech KenTech wrote:

i'm thinking of Paudio's SD15 if i have the money i need. If i don't, maybe i will try SM115K from beyma, or Selenium 15PW6.
does anyone have the database for Horn resp  for this Enclosure ?
10x
 
This is the HR input for 1 Beyma SB15 cab loaded with Beyma 15P1200Nd in half space...
Beyma SB15-1 - Hornresponse Input Data
cheers


Posted By: KenTech
Date Posted: 01 July 2009 at 8:23am
thanx a lot !!!


Posted By: KenTech
Date Posted: 01 July 2009 at 8:48am
here. I;ve simulated Beyma SM115K and Paudio SD15
Blak: SD15
Grey: Sm115K
This doesn't look like the simulation above, where is simulated a SB15-1 Cab and a SB18-1 Cab....
Why ?



Posted By: bitzo
Date Posted: 01 July 2009 at 8:49am
this design don't have any braces but it's also so compact. Someone have ever heard/built this cab?
 Should be suitable for kick section over scoops? Before someone says go for hd15/hd18, I hate access port Angry.


-------------
http://www.unitedroots.it - United Roots SoundSystem site


Posted By: KenTech
Date Posted: 01 July 2009 at 8:49am
Originally posted by Ibex Ibex wrote:

Originally posted by space-face space-face wrote:

 
Beyma SB15-1 vs. SB18-1 - SPL
black = Beyma SB18-1 - 18P1200Nd
grey = Beyma SB15-1 - 15P1200Nd

here. I;ve simulated Beyma SM115K and Paudio SD15
Blak: SD15
Grey: Sm115K
This doesn't look like the simulation above, where is simulated a SB15-1 Cab and a SB18-1 Cab....
Why ?



Posted By: Ibex
Date Posted: 01 July 2009 at 9:16am
Originally posted by KenTech KenTech wrote:

This doesn't look like the simulation above, where is simulated a SB15-1 Cab and a SB18-1 Cab....
Why ?
 
Note that you have to set the driver arangement to tapped (Tools - Driver Arangement - Tapped Horn)
I made the simulation with:
-  Ang 2,0 x Pi (half space)
- Eg 2,83 (volts)
Wink


Posted By: Ibex
Date Posted: 01 July 2009 at 9:32am
Originally posted by bitzo bitzo wrote:

this design don't have any braces but it's also so compact. Someone have ever heard/built this cab?
 Should be suitable for kick section over scoops? Before someone says go for hd15/hd18, I hate access port Angry.
 
no braces but a double sized top and bottom panel... Wink atherwise you would have resonating wall problems:
http://www.speakerplans.com/forum/forum_posts.asp?TID=26592&PID=281689&title=beyma-sb18-driver#281689 - http://www.speakerplans.com/forum/forum_posts.asp?TID=26592&PID=281689&title=beyma-sb18-driver#281689


Posted By: _djk_
Date Posted: 01 July 2009 at 11:12am
This post is about the 18" version, but applies to the 15" version as well:
 
The 'specifications' on that box are pure fiction.

It will only be 101dB above 100hz, and it will be at least 10dB down at 33hz.

It's similar to this EV cabinet, but can't work as well as it's smaller.

http://archives.telex.com/archives/EV/Speakers/EDS/SH-1810L-ER%20EDS.pdf - http://archives.telex.com/archives/...0L-ER%20EDS.pdf

But on the other hand, many people are satisified with the EV, so you may be satisfied with yours.

Keep in mind:

A 2 cu ft 2nd order sealed box with an F3 of 30hz can only be 0.18% efficient (84.55dB).
A 2 cu ft 4th order vented box with an F3 of 30hz can only be 0.36% efficient (87.56dB).
A 2 cu ft 6th order vented box with an F3 of 30hz can only be 0.90% efficient (91.54dB).

The 'horn' on the EV/Beyma is too short to work below 100hz, and the rear volume acts as a vented box below 100hz (and it is tiny).

Note: the correction factor between 2.83V/1M and 4V/10' is +6.67dB

The Beyma is only 2/3 the total size of the EV, so it must be almost 2dB less efficient below 50hz.


http://archives.telex.com/archives/EV/Speakers/EDS/SH-1810L-ER%20EDS.pdf -


-------------
djk


Posted By: bitzo
Date Posted: 01 July 2009 at 11:19am
I see.  Good solution, better than adding braces and an access port on the bottom Thumbs Up
Regarding your sim, this cab drop so low, too low for my purpose, 80hz is enough to me. In your opinion, what is the mod to loose low end and encrease spl and kick?


-------------
http://www.unitedroots.it - United Roots SoundSystem site


Posted By: Ibex
Date Posted: 01 July 2009 at 1:37pm
Originally posted by bitzo bitzo wrote:

I see.  Good solution, better than adding braces and an access port on the bottom Thumbs Up
Regarding your sim, this cab drop so low, too low for my purpose, 80hz is enough to me. In your opinion, what is the mod to loose low end and encrease spl and kick?
 
Why don't you like braces? Ermm
I think you have to take another design to achieve your requirements...


Posted By: bitzo
Date Posted: 01 July 2009 at 1:55pm
I love braces but I hate access port because can ruin all the built.
Now I have an mt115 and 2 reduced version of sl36 to load 15" and sit behind  the mt115, I'm pretty satisfied of them. But if I find a design for kick that don't have access port and not a simple reflex and can sit over superscooper....I'll return to eat sawdust Wink


-------------
http://www.unitedroots.it - United Roots SoundSystem site


Posted By: Ibex
Date Posted: 01 July 2009 at 2:24pm
Originally posted by bitzo bitzo wrote:

I love braces but I hate access port because can ruin all the built.
Now I have an mt115 and 2 reduced version of sl36 to load 15" and sit behind  the mt115, I'm pretty satisfied of them. But if I find a design for kick that don't have access port and not a simple reflex and can sit over superscooper....I'll return to eat sawdust Wink
 
Sorry bitzo, I can't follow you... What do you mean with access port?
Do you want a new cab instead of the MT115? Should the new design have almost identical frequency response as the MT115 with a peak around 100Hz?


Posted By: bitzo
Date Posted: 01 July 2009 at 2:33pm
ehmm... Access port...how can I say...in Italian portello di accesso....I'll show you, here's a pic from some insomnia built




the freq range would be 80hz 200hz, peak at 100hz shoud be so nice.



-------------
http://www.unitedroots.it - United Roots SoundSystem site


Posted By: Ibex
Date Posted: 01 July 2009 at 4:17pm
Originally posted by bitzo bitzo wrote:

ehmm... Access port...how can I say...in Italian portello di accesso....I'll show you, here's a pic from some insomnia built


Aaah! Now I understand! I am with you... Approve
You mean the access panel! Why does such a access panel ruin all the built???
What kind of enclosures are those on the pic? They look very tidy!
Does the new kickbass cab have to be a 15" design?


Posted By: bitzo
Date Posted: 01 July 2009 at 5:05pm
These cabs are omnitop 15 billfitz maurice design.
yes will be a 15" driver loaded, PD156 because I already have 3 of these woofers.


-------------
http://www.unitedroots.it - United Roots SoundSystem site


Posted By: Ibex
Date Posted: 01 July 2009 at 9:25pm
Originally posted by bitzo bitzo wrote:

These cabs are omnitop 15 billfitz maurice design.
yes will be a 15" driver loaded, PD156 because I already have 3 of these woofers.


Sorry bitzo, but I think the only design that will meet your requirements is a bph as for example the hd15, these designs will have the peak around your desired frequency range.
All the hybrid constructions peak around 160-220Hz and give you a response down to ~50Hz...
Maybe the RCF Bassbin is a solution, which is able to satisfy you?
http://www.speakerplans.com/forum/forum_posts.asp?TID=26592&PID=281769&title=beyma-sb18-driver#281769

I'll go into the matter...


Posted By: Ibex
Date Posted: 02 July 2009 at 3:45pm
Hi bitzo,
here is a simulation of one RCF Bassbin driven by your PD156....

RCF Bassbin - PD156 - SPL
RCF Bassbin - PD156

I think that the upper cut-off frequency of this design will be too low for you...?

greez


Posted By: bitzo
Date Posted: 02 July 2009 at 4:09pm
thanks for your sim. This is a good and compact sub but go too low for my purpose....
I have some play with hr around rlh concept and ported wbin design...
http://img20.imageshack.us/i/rlhsim.jpg/">

3 of them sit perfectly on 4 supers.

cheers, bitzo



-------------
http://www.unitedroots.it - United Roots SoundSystem site


Posted By: Ibex
Date Posted: 02 July 2009 at 4:34pm
Looks nice, bitzo!
So your concept is a vented frontloaded horn?
I also thought about such a design like the C4 Sub... (original C4 also goes too low)
What outer dimensions will your cab have?
greez


Posted By: bitzo
Date Posted: 02 July 2009 at 4:43pm

It's a vented rear loaded horn.
check out. I named it Tie Fighter, external dimension about 80x60x50




-------------
http://www.unitedroots.it - United Roots SoundSystem site


Posted By: Ibex
Date Posted: 02 July 2009 at 5:49pm
Interesting design!
Looks like an compound horn: Small RLH with a planar waveguide in the front of the driver...



Posted By: bitzo
Date Posted: 02 July 2009 at 6:44pm
I simmed it like a vented horn not like a compound....more stuff to play with hr ;)


-------------
http://www.unitedroots.it - United Roots SoundSystem site


Posted By: Ibex
Date Posted: 02 July 2009 at 7:04pm
Originally posted by bitzo bitzo wrote:

I simmed it like a vented horn not like a compound....more stuff to play with hr ;)


Would be interesting, if you will get the same results...


Posted By: KenTech
Date Posted: 04 July 2009 at 3:45am
will 2 x SB15-1 subs go as low as a BPH Loaded with C18ELf from Paudio ? Will this bins, both of them, have higher SPL  ? Maybe higher SPL on Kick zone ?
it's 2 x SB15-1 loaded with SN15LF, or SD15 from Paudio versus 1 x Es18 BPH Loaded With C18ELf from Paudio. What do you think ?


Posted By: KenTech
Date Posted: 04 July 2009 at 4:06am
What about 1 x SB18-1 Loaded With Paudio C18ELf Versus Es18BPH Loaded with the same driver, C18ELf from Paudio.
wich one goes lower? wich one has higher SPL ? Where it has higher SPL ?
Thanx


Posted By: Ibex
Date Posted: 04 July 2009 at 9:46am
Originally posted by KenTech KenTech wrote:

What about 1 x SB18-1 Loaded With Paudio C18ELf Versus Es18BPH Loaded with the same driver, C18ELf from Paudio.
wich one goes lower? wich one has higher SPL ? Where it has higher SPL ?
Thanx

Hi KenTech!
Do you mean the Paudio C18-650 EL?
cheers


Posted By: KenTech
Date Posted: 04 July 2009 at 1:42pm
Paudio C18ELF . It's from the new series. It's a lit bit, if not the same as C18-65o EL. The difference between this 2 drivers is not big.
So, what do you think ?

http://www.paudiothailand.com


Posted By: Ibex
Date Posted: 04 July 2009 at 3:56pm


Beyma SB18 vs. ES18-BPH - C-18ELF - SPL
black = SB18 - PAudio C-18ELF - 231 litre
grey = ES18-BPH - PAudio C-18ELF - 302 litre

Beyma SB15 2x - SN-15LF vs. ES18-BPH - C-18ELF - SPL
black = Beyma SB15 x2 - PAudio SN-15LF - 314 litre
grey = ES18-BPH - PAudio C-18ELF - 302 litre

Well, the RLBPH offer a marginal lower cut-off frequency, I think the big advantage would be in the kick-bass range. I would prefer the 2x SB15 cabs, better effiency and almost the same size as one ES18-BPH... no fear, the dip around 110Hz will not be as deep and the peaks will rise and fall snoother Wink
Although I would advise to make a prototype and compare both by listening! Till now I got no auditory impressions of these RLBPH designs. I only heard the father of RLBPH, the EV MTL-1X, before, and they realy rock your body, but unfortunately no direct comparison to other cabs or different designs.
cheers


Posted By: Ibex
Date Posted: 04 July 2009 at 4:11pm
Handed in later, the comparison of the both RLBPH designs with the original Beyma drivers to the PAudio ones...

Beyma SB15 - SN-15LF vs. 15P1200Nd - SPL
black = Beyma SB15 - PAudio SN-15LF
grey - Beyma SB15 - Beyma 15P1200Nd

Beyma SB18 - 18P1200Nd vs. C-18ELF - SPL
black = Beyma SB18 - PAudio C-18ELF
grey = Beyma SB18 - Beyma 18P1200Nd


Posted By: KenTech
Date Posted: 05 July 2009 at 4:56am
Ibex, thanx a lot !! until i sell my BPH Loaded with C18, i will make a SB18 Cab, as soon as posibile. It's smaller, more compact and i'm curious too of the comparason result.
Can u post as well the Plot for  DIAPHRAGM DISPLACEMENT, at 600W/piece or 1200W/2 bins, for SN15LF.
10q, again !


Posted By: Ibex
Date Posted: 05 July 2009 at 2:32pm
Originally posted by KenTech KenTech wrote:

Ibex, thanx a lot !! until i sell my BPH Loaded with C18, i will make a SB18 Cab, as soon as posibile. It's smaller, more compact and i'm curious too of the comparason result.
Can u post as well the Plot for  DIAPHRAGM DISPLACEMENT, at 600W/piece or 1200W/2 bins, for SN15LF.
10q, again !


Beyma SB15 - SN-15LF - Excursion 69,28V
Beyma SB15 - PAudio SN-15LF - Excursion 69,28V

KenTech,
I'm sorry, I made a little mistake with the simulation between 2xSB15 vs. ES-18BPH, now the plot above should be correct!

Yesterday I hab the chance to get an auditory impression of an stack of 4 ES-18BPH loaded with Eminence Omega Pro-18A. They played not too deep, but a clear punchy sound with the right kick. The 4 cabs were driven by 2 bridged QSC 2450, so more than enough power. Their unprocessed response was very flat and they did easily 145dB! They did a better job than a stack of 4 HK RL118!

ES-18BPH x4 - Omega Pro-18A - SPL 113,13V
ES-18BPH x4 - Eminence Omega Pro-18A - SPL 113,13V

greez



Posted By: KenTech
Date Posted: 05 July 2009 at 3:06pm
thanx again Ibex.
Maybe i'm asking too much.. but can u post the plot of comparison between 2 x SB15-1 Loaded with Beyma SM115K and ES18BPH loaded with C18ELF, a plot of comparison between 2 x SB15-1 loaded with SD15 ( Paudio ) (http://www.p-audio.co.uk/products/db_product_1_13_sd-15.htm ) and Es18BPH loaded with C18ELF....
i'm trying to make a point of view... does it worth to change the ES18BPH with 2 x SB15-1 ? if yes, wich one driver mentionated by me ( SN15LF, SD15, SM115K ).
have a great day.


Posted By: Ibex
Date Posted: 05 July 2009 at 3:26pm
Beyma SB15 - SN-15LF vs. SM115K - SPL
black = Beyma SB15 - SM115K
grey = Beyma SB15 - SN-15LF

Beyma SB15 - SN-15LF vs. SD15 - SPL
black = Beyma SB15 - SD15
grey = Beyma SB15 - SN-15LF

Beyma SB15 - SN-15LF vs. FL-15LF - SPL
black = Beyma SB15 - FL-15LF
grey = Beyma SB15 - SN-15LF

Beyma SB15 - SN-15LF vs. C-15LF - SPL
black = Beyma SB15 - C-15LF
grey = Beyma SB15 - SN-15LF


Posted By: KenTech
Date Posted: 05 July 2009 at 3:30pm
thanx againSmile
one more thing Ibex..
i;ve founded a very very cheap driver. at about 35 Euros.
i'm curious of his plot's in SB15-1 cab. Here are the T/S parameter
FS - 40 hz
Re - 5.5 ohm
Qes - 0.35
Qms - 2.63
Qts - 0.31
Vas - 190 L
Sd - 839 cm2
Xmax - 5 mm
Mms - 80 gr
Bl - 19.2
Le - 1.76
Cms - 0.19 (mm/N)
Rms - 7.96 (kg/s)
Nominal Power - 500 W
Program Power - 1000 W
SPL 1w/1m - 98 db
Frec. response - 40-3000 hz

Voice coil diameter - 75.5 mm
Voice coil material - CU
Former meterial - Al


Posted By: Ibex
Date Posted: 05 July 2009 at 3:32pm
Originally posted by KenTech KenTech wrote:

thanx again Ibex.
Maybe i'm asking too much.. but can u post the plot of comparison between 2 x SB15-1 Loaded with Beyma SM115K and ES18BPH loaded with C18ELF, a plot of comparison between 2 x SB15-1 loaded with SD15 ( Paudio ) (http://www.p-audio.co.uk/products/db_product_1_13_sd-15.htm ) and Es18BPH loaded with C18ELF....
i'm trying to make a point of view... does it worth to change the ES18BPH with 2 x SB15-1 ? if yes, wich one driver mentionated by me ( SN15LF, SD15, SM115K ).
have a great day.


Beyma SB15 2x - SM115K vs. ES18-BPH - C-18ELF - SPL
black = Beyma SB15 2x - SM115K
grey = ES18-BPH - C-18ELF

Beyma SB15 2x - SD15 vs. ES18-BPH - C-18ELF - SPL
black = Beyma SB15 2x - SD15
grey = ES18-BPH - C-18ELF


Posted By: KenTech
Date Posted: 05 July 2009 at 3:37pm
Originally posted by KenTech KenTech wrote:

thanx againSmile
one more thing Ibex..
i;ve founded a very very cheap driver. at about 35 Euros.
i'm curious of its plot's in SB15-1 cab. Here are the T/S parameter
FS - 40 hz
Re - 5.5 ohm
Qes - 0.35
Qms - 2.63
Qts - 0.31
Vas - 190 L
Sd - 839 cm2
Xmax - 5 mm
Mms - 80 gr
Bl - 19.2
Le - 1.76
Cms - 0.19 (mm/N)
Rms - 7.96 (kg/s)
Nominal Power - 500 W
Program Power - 1000 W
SPL 1w/1m - 98 db
Frec. response - 40-3000 hz

Voice coil diameter - 75.5 mm
Voice coil material - CU
Former meterial - Al


Posted By: Ibex
Date Posted: 05 July 2009 at 3:50pm
Originally posted by KenTech KenTech wrote:

thanx againSmile
one more thing Ibex..
i;ve founded a very very cheap driver. at about 35 Euros.
i'm curious of his plot's in SB15-1 cab. Here are the T/S parameter
FS - 40 hz
Re - 5.5 ohm
Qes - 0.35
Qms - 2.63
Qts - 0.31
Vas - 190 L
Sd - 839 cm2
Xmax - 5 mm
Mms - 80 gr
Bl - 19.2
Le - 1.76
Cms - 0.19 (mm/N)
Rms - 7.96 (kg/s)
Nominal Power - 500 W
Program Power - 1000 W
SPL 1w/1m - 98 db
Frec. response - 40-3000 hz

Voice coil diameter - 75.5 mm
Voice coil material - CU
Former meterial - Al


Beyma SB15 2x - KenTech vs. ES18-BPH - C-18ELF - SPL
black = Beyma SB15 2x - KenTech
grey = ES18-BPH - C-18ELF

looks quiet good to me too!
which driver are we talking about?
cheers


Posted By: KenTech
Date Posted: 05 July 2009 at 3:58pm
it's one from Bluetech... called LW1503.
at 35E it's SH, but new is about 58-60E/piece.
Please, tell me. The plot's are 1w for C18ELF and 1W for both SB15 ( 0,5W for each one ) , or 1w for each SB15 ( meaning 2w in total ). And, it's in 2 Pi ?
thanx


Posted By: Ibex
Date Posted: 05 July 2009 at 4:07pm
Originally posted by KenTech KenTech wrote:

it's one from Bluetech... called LW1503.
at 35E it's SH, but new is about 58-60E/piece.
Please, tell me. The plot's are 1w for C18ELF and 1W for both SB15 ( 0,5W for each one ) , or 1w for each SB15 ( meaning 2w in total ). And, it's in 2 Pi ?
thanx

HR input data:
- SB15: 1xPi (-> 2 cabs); 2,83V (-> 1W)
- ES-18BPH: 2xPi (-> 1 cab); 2,83V (-> 1W)



Posted By: KenTech
Date Posted: 05 July 2009 at 4:10pm
1w in 2 cabs, right ?


Posted By: Ibex
Date Posted: 05 July 2009 at 4:21pm
Originally posted by KenTech KenTech wrote:

1w in 2 cabs, right ?


I have to disapoint you, it's unfortunately...

2W/2cabs = 2x 1W/1cab

I think that was my fault Embarrassed


Posted By: KenTech
Date Posted: 14 July 2009 at 10:04pm
so, actualy is 3 db less, right ?


Posted By: Ibex
Date Posted: 15 July 2009 at 9:31am
exactly, 3dB less!
 
Have you already built a SB18 test cab to compare with the ES-18BPH?


Posted By: Pooley
Date Posted: 15 July 2009 at 12:27pm
 
I should be building (well glueing together) the beyma cab in the next couple of weeks, going to load it with a void v-18 1200.
 
I'll post measurements when i'm done but I can't measure absolute SPLs


Posted By: Ibex
Date Posted: 15 July 2009 at 1:07pm
Great! Also relative SPL would be fine...
Have fun building this cab!
cheers


Posted By: KenTech
Date Posted: 15 July 2009 at 1:10pm
Ibex, so can u post a plot with correct input data for 2 x sb15 loaded with SN15LF and a BPH with C18ELF ? i want to se if it's worth it to build 2 x sb15 instead of 1 x BPH ( wich i already have ).


Posted By: Ibex
Date Posted: 15 July 2009 at 2:09pm
Originally posted by KenTech KenTech wrote:

Ibex, so can u post a plot with correct input data for 2 x sb15 loaded with SN15LF and a BPH with C18ELF ? i want to se if it's worth it to build 2 x sb15 instead of 1 x BPH ( wich i already have ).
 
Beyma SB15 x2 - SN-15LF vs. ES18-BPH - C-18ELF - SPL
black = 2x SB15 - PAudio SN15LF (2Pi, 1W/2.00V)
grey = ES-18BPH - PAudio C-18ELF (2Pi, 1W/2.83V)


Posted By: bitzo
Date Posted: 15 July 2009 at 2:22pm
could you post the input data for single 18" version and 15" version?


-------------
http://www.unitedroots.it - United Roots SoundSystem site


Posted By: Ibex
Date Posted: 15 July 2009 at 7:42pm
Originally posted by bitzo bitzo wrote:

could you post the input data for single 18" version and 15" version?


Beyma SB15-1 - Hornresponse Input Data
Beyma SB15-1 - Input

Beyma Sb18-1 - Hornresponse Input Data
Beyma SB18-1 - Input


Posted By: bitzo
Date Posted: 16 July 2009 at 9:01am
muy obrigado.
vtc is with or without driver?


-------------
http://www.unitedroots.it - United Roots SoundSystem site


Posted By: KenTech
Date Posted: 16 July 2009 at 9:17am
Ibex, could you give me a link from where to download the Hornresp that u have ? because mine is different, and because of that, i can't simulate any driver in SB15....
10x


Posted By: Ibex
Date Posted: 16 July 2009 at 8:11pm
bitzo, driver displacement is not subtracted from vtc, I expected that the driver is fireing into the chamber and reverse mounted so that the magnet extends into the horn/port...

KenTech,
http://mywebsite.bigpond.com/dmcbean/

cheers


Posted By: KenTech
Date Posted: 20 July 2009 at 8:50am
thanx a lot ibex.
look what i am thinking...
what if... It's a folded horn, isn't it ? what do you think ?



Posted By: bitzo
Date Posted: 20 July 2009 at 9:13am
Originally posted by Ibex Ibex wrote:

bitzo, driver displacement is not subtracted from vtc, I expected that the driver is fireing into the chamber and reverse mounted so that the magnet extends into the horn/port...

KenTech,
http://mywebsite.bigpond.com/dmcbean/

cheers

with this displacement I have to add cone volume to vtc, instead if it's mounted straight I have to substract all the driver displacement.


-------------
http://www.unitedroots.it - United Roots SoundSystem site


Posted By: mrchay
Date Posted: 20 July 2009 at 10:51am
Idiot question:
mounting of the driver in this cab - firing into the chamber (magnet in the 'horn' mouth), or other way round? which is the intended design?


Posted By: KenTech
Date Posted: 20 July 2009 at 11:02am
the magnet downwords, beacause eitherwise, it won;t fit.



Posted By: Ibex
Date Posted: 20 July 2009 at 11:05am
Originally posted by KenTech KenTech wrote:

thanx a lot ibex.
look what i am thinking...
what if... It's a folded horn, isn't it ? what do you think ?
 
Hehe!
KenTech, in that case your old HR version should be able to simulate that cab... Wink
greez


Posted By: Ibex
Date Posted: 20 July 2009 at 11:10am
Originally posted by bitzo bitzo wrote:

Originally posted by Ibex Ibex wrote:

bitzo, driver displacement is not subtracted from vtc, I expected that the driver is fireing into the chamber and reverse mounted so that the magnet extends into the horn/port...

with this displacement I have to add cone volume to vtc, instead if it's mounted straight I have to substract all the driver displacement.
 
bitzo, you are absolutely correct!
Do you think that these volume differences will have a big influence on the frequency response/performance of this cab?
cheers


Posted By: Ibex
Date Posted: 20 July 2009 at 11:14am
Originally posted by KenTech KenTech wrote:

the magnet downwords, beacause eitherwise, it won;t fit.

 
Thx KenTech, I never tried if the driver would fit reverse mounted...
 
bitzo, so you will have to subtract the driver volume from vfc.
 
greez


Posted By: mrchay
Date Posted: 20 July 2009 at 12:21pm
this is what confused me.

incidentally, im interested here because it looks like a good compact sub for a 12v system - if build it as a 12inch-er.

Any recomendation for 12inch driver to get the most bang for my buck - i dont want to make the mistake of inefficient car sub drivers again...




Posted By: KenTech
Date Posted: 20 July 2009 at 12:52pm
ibex, very few drivers aren't deep. I haven't tried, but i've measured with Autocad the distance and it seems like you need a driver no deeper than ~16 cm...
that's realy imposible... :)


Posted By: mrchay
Date Posted: 20 July 2009 at 2:25pm
hold your horses

theres a new fashion for flat subs - they are only a few inches thick..

http://www.google.co.uk/search?q=flat+sub

people with expensive sports cars with nowhere for proper enclosures to go put them behing seats and whatnot..

presumably efficiency is sacraficed... dont really know. they are interesting looking things anyway..


Posted By: KenTech
Date Posted: 16 August 2009 at 11:42am
i Own u some Pics. Here they are:
OSB15mm. Super Reinforced SB15 Design








The box has 17Kg, and the speaker has 15Kg, so total= 32Kg.
The speaker is Paudio strongest speakers, SD15.


Posted By: Glenn
Date Posted: 16 August 2009 at 2:47pm
Have you compared them to the ES18 that you were talking about. How do they sound?


Posted By: bitzo
Date Posted: 16 August 2009 at 5:04pm
so different beasts I think....regarding sims beyma cab drops lower than a bandpass horn but have less kick but more flat under 120 hz. I'm playing around this tapped horn to get more kicky and less subby ;P


-------------
http://www.unitedroots.it - United Roots SoundSystem site


Posted By: KenTech
Date Posted: 16 August 2009 at 6:58pm
it has less SPL than BPH. It sounds flater , goes deeper but doesn't have that bump on Kick zone , like BPH. Overall, i am more satisfied with this cab instead of BPH. My near future plan is to build another SB15 , loaded with the same SD15 driver. Than i will eclipse an BPH, in every aspects. This 2 cabs will be more portable( beeing 2 subs instead of 1 ) and it will have a lower cutoff. Sounds more linear.


Posted By: Ibex
Date Posted: 27 August 2009 at 11:18am
Originally posted by KenTech KenTech wrote:

it has less SPL than BPH. It sounds flater , goes deeper but doesn't have that bump on Kick zone , like BPH. Overall, i am more satisfied with this cab instead of BPH. My near future plan is to build another SB15 , loaded with the same SD15 driver. Than i will eclipse an BPH, in every aspects. This 2 cabs will be more portable( beeing 2 subs instead of 1 ) and it will have a lower cutoff. Sounds more linear.
 
Great that you are satisfied with the beyma design!
Did you already have the chance to measure an campare both together?
greez


Posted By: Teunos
Date Posted: 28 August 2009 at 11:59am
Originally posted by KenTech KenTech wrote:

ibex, very few drivers aren't deep. I haven't tried, but i've measured with Autocad the distance and it seems like you need a driver no deeper than ~16 cm...
that's realy imposible... :)


RCF L15P200AK is only 13.5cm high, and so are enough others. rcf l15s801, lf15g401 is 15.8 as well as L15P400 and MB15H401. And those are only RCF. Btw, the RCF MB15H401 sims very good with this designWink


-------------
Best regards,
Teun.


Posted By: yasint
Date Posted: 01 October 2009 at 10:18am
Hey thanks. all of you did a fantastic job graphically representation is very helpful to understand it. its really helpful for working on it.


-------------
http://www.emanprinting.com/sticker-printing/Sticker-Maker.php - stikcer maker
http://www.emanprinting.com/sticker-printing/Custom-Sticker-Printing.php - custom sticker printing


Posted By: Ibex
Date Posted: 01 October 2009 at 1:02pm
Thx! U're welcome!


Posted By: rizzardo
Date Posted: 13 October 2009 at 6:08pm
hi,

thanks to all had wrote on this very interesting thread!!!

I want to realize a cuple of this sb15 beyma project.

But, finally, what different woofers can work good in this project?

Like RCF, B&C, 18sound, Ciare ecc ecc ecc ...


Thanks!!


-------------
Bass is good when they move our trousers


Posted By: aw-audio84
Date Posted: 22 September 2020 at 11:07am
One Member mentionend the ARLS (Advanced Reflex Loaded System) in the first Thread.
If you like a clean and very well performing Reflex Sub, that matches easy with nearly all kind of Tops from 38 - 150Hz and a very handy shape, then this Version 2 of the ARLS could be interesting.

https://aw-audio.de/boxenbauplaene/PS-Bass%20MK2_.pdf


Posted By: studio45
Date Posted: 22 September 2020 at 1:20pm
Now that is interesting -about 5 years ago, I designed and made a set of 15" bass bins that ended up being almost exactly like that plan. I had internal volume of 87 litres and a tuning frequency of 55Hz not 42Hz, but otherwise the layout was nearly identical, with a big shelf port at the bottom and minimum-width baffle. With Fane Colossus 15XB's in them, they performed extremely well. Undistorted deep bass to 40Hz and good cone control. A pair in a corner, seemed at least equal to a 2x18 bin (although no comparative testing was done). 

Perhaps it is one of those magic formulas that works with lots of different 15" drivers! It's a convenient size for putting in small vans or cars too. 


-------------
Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA



Print Page | Close Window

Forum Software by Web Wiz Forums® version 12.06 - https://www.webwizforums.com
Copyright ©2001-2023 Web Wiz Ltd. - https://www.webwiz.net