Do you know this Project from Beyma ? |
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Ibex
Young Croc Joined: 27 May 2009 Status: Offline Points: 1013 |
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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)
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Ibex
Young Croc Joined: 27 May 2009 Status: Offline Points: 1013 |
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no braces but a double sized top and bottom panel... atherwise you would have resonating wall problems:
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_djk_
Old Croc Joined: 23 November 2004 Location: United States Status: Offline Points: 6002 |
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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/...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. |
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djk
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bitzo
Registered User Joined: 20 November 2007 Location: Italy Status: Offline Points: 977 |
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I see. Good solution, better than adding braces and an access port on the bottom
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? |
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Ibex
Young Croc Joined: 27 May 2009 Status: Offline Points: 1013 |
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Why don't you like braces?
I think you have to take another design to achieve your requirements...
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bitzo
Registered User Joined: 20 November 2007 Location: Italy Status: Offline Points: 977 |
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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 |
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Ibex
Young Croc Joined: 27 May 2009 Status: Offline Points: 1013 |
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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?
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bitzo
Registered User Joined: 20 November 2007 Location: Italy Status: Offline Points: 977 |
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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. Edited by bitzo - 01 July 2009 at 2:41pm |
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Ibex
Young Croc Joined: 27 May 2009 Status: Offline Points: 1013 |
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Aaah! Now I understand! I am with you... 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? |
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bitzo
Registered User Joined: 20 November 2007 Location: Italy Status: Offline Points: 977 |
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These cabs are omnitop 15 billfitz maurice design.
yes will be a 15" driver loaded, PD156 because I already have 3 of these woofers. |
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Ibex
Young Croc Joined: 27 May 2009 Status: Offline Points: 1013 |
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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... |
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Ibex
Young Croc Joined: 27 May 2009 Status: Offline Points: 1013 |
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Hi bitzo,
here is a simulation of one RCF Bassbin driven by your PD156.... RCF Bassbin - PD156 I think that the upper cut-off frequency of this design will be too low for you...? greez |
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