JF Vented Horn (P-audio E18-600a)
Printed From: Speakerplans.com
Category: Plans
Forum Name: New Projects Forum
Forum Description: Forum for new speakerplans projects, in memory of Tony Wilkes, 1953 - 2014
URL: https://forum.speakerplans.com/forum_posts.asp?TID=15928
Printed Date: 26 March 2026 at 7:10pm
Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com
Topic: JF Vented Horn (P-audio E18-600a)
Posted By: Jake_Fielder
Subject: JF Vented Horn (P-audio E18-600a)
Date Posted: 04 April 2008 at 10:14am
|
Ok, im have a final design for a ported horn, im going to prototype it in about a month, if anyone knows of any reason i should re-design this or scrap it let them speak now or forever hold their peace!
The design looks a little like this: But picture the port folded so you can get the driver out of the top, (outer dimentions will be something like 818mm x 636mm x 636mm)
 The mouth is 3600cm2 not 4800 as the diagram states.Input Parameters:
 Sensitivity 1w/1m: (bear in mind the idea is to EQ the tuning freq up (37Hz) as there is V low excursion at this point)
 Driver excursion plot at 700w - probably the most i'll put through these....
 I know the xmax isnt rated at 10mm, but i've been talking about this before and i was thinking of giving it a try anyway....
Heres the little fellas!:
 |
Replies:
Posted By: jethrocker
Date Posted: 04 April 2008 at 10:32am
|
Just wondering when looking at the plots how the eq will work out. The problem is in order to get a flat response down to the port tuning frequency you're going to need to apply boost from just under 37 up to about 55Hz...this is taking you into the area of peak excursion above the tuning frequency, so your excursion might be worse than predicted. It's always said HR excursion plots are exaggerated, but I'm never sure by how much, I'm guessing it's not likely to be worse overall in reality than the 11mm on the plot. You're other option is to eq with a bit of a dip around 55Hz, might give you higher overall safe output, but also a particular sound, which might be what you want.. |
Posted By: Jake_Fielder
Date Posted: 04 April 2008 at 10:34am
|
Yes, i think there will be a dip, i'll just find what i wrote about it before... i also think i drew a pic of what it might look like.....
|
Posted By: Jake_Fielder
Date Posted: 04 April 2008 at 10:40am
This is what i predicted it may look like:
 Obviously when i prototype it i will work out the best EQ to get the plot as flat and low as possible without increacing excursion beyond the highest it is now.
|
Posted By: Jake_Fielder
Date Posted: 04 April 2008 at 10:46am
Thats what i thought originally, and i know its a risky buisness, but if this works and has a reasonable flatish output from 35-180 with a bit of EQ and sound half decent then it'll be a great result for a single cab of that size....
|
ME! wrote:Posted By: darkmatter
Date Posted: 04 April 2008 at 1:19pm
| Will using eq affect the phase around that point, or is that not something you really need to worry about? |
Posted By: Jake_Fielder
Date Posted: 04 April 2008 at 1:32pm
|
I'm not sure, if it did affect the phase what would happen?
i was just going to use delay to match the top frequency ~Hz to what ever mid tops i use, then not worry about what happens bellow the crossover point. I haven't prototyped any of my designs yet so i don't know if I'm doing it right,
I think that the tuning of this cab will be different to whats been predicted, so 'I'll just have to work it out after i build it, i defiantly don't want to eq the wrong bit! IE anywhere thats not the tuning frequency!
 driver!Come to think of it, this design is also a parallel 6th order bandpass with a flared port.
|
Posted By: darkmatter
Date Posted: 04 April 2008 at 3:14pm
no idea i was hoping you could tell me  i guess i was just wondering whether you'd effectively be changing the group delay by having to eq the signal that goes into the cab. but im probably worrying about nothing as the difference would no doubt be imperceptible - people like scoops so... yeah would kind of destroy the point in going for a good value driver if you have to go through 4 just finding the eq point lol  |
Posted By: Jake_Fielder
Date Posted: 04 April 2008 at 3:27pm
| When i build it im going to put a tone from a signal generator through an amp (about 200w) and go up and down until i find the tuning point (where the driver moves least), then EQ the hell out of it at that point!! |
Posted By: Jake_Fielder
Date Posted: 04 April 2008 at 3:30pm
As far as i know, using any EQ or limiter or crossover will shift the phase slightly, depending on what type of filter is used...
Ha, yep, im gonna have to be careful, Hopefully once i have done all the complicated stuff i can draw up a design that anyone can use, as a simple buget speaker, with a good frequency range! (fingers crossed!)
|
Posted By: Disco Stu
Date Posted: 04 April 2008 at 6:11pm
|
Hi Jake I would be tempted to do a couple of things to try and even out the cone loading, as I remember the E18 driver has quite a thin cone.
1) Reverse the driver to aid heat escaping 2) Mount the driver parallel to the back wall of the cab if possible to prevent some uneven stresses caused by one side of the cone being closer to a surface than the other. Stu ------------- All you need to know is: Sensitivity + Power Handling - Power Compression = Max Output My acts: www.myspace.com/thebowiexperience www.myspace.com/scheisseelektronisches |
Posted By: Jake_Fielder
Date Posted: 07 April 2008 at 10:14am
|
The loading will be better than the pic i put up, i have since drawn it out to scale and it looks much better, the chamber in front of the driver is almost symetrical (in 2d) and the port is folded in such a way that the rear chamber isnt too bad. I thought as its ported it would be better that way round? especially at the tuning freq, as all the air is moving through the port, but i would have thought that above the tuning freq the horn side was cooler....? what do you think?
|
Posted By: JaKe
Date Posted: 07 April 2008 at 11:10am
|
I think you would would get a better cooling effect with the magnet in the throat chamber as you would be making use of convection cooling. JaKe |
Posted By: Jake_Fielder
Date Posted: 07 April 2008 at 11:12am
|
I dont understand, how would that work? |
Posted By: ceharden
Date Posted: 07 April 2008 at 11:26am
|
Since both sides of the driver are effectively vented to the outside it doesn't matter which way round you put the driver in terms of heat. Oh and you don't actually need airflow as such, vibrating air can also transfer the heat just as well. One of my mates did a project at uni using speakers playing tones to cool heatsinks rather than fans! |
Posted By: Jake_Fielder
Date Posted: 07 April 2008 at 11:34am
Thats really interesting Chris, cheers.
I wouldnt be too gutted if i destroyed one driver in the prototyping proccess, (as i have 5 recones to do anyway
) so i think i will work out the tuning freq and everything then EQ it to ideal settings and push the cab really hard for a long while to make sure i know its capable of, then i'll post all the results and proper diagrams and EQ setting... |
Posted By: ceharden
Date Posted: 07 April 2008 at 11:50am
|
On the subject of heat, drivers survive being put in small completely sealed chambers. So having any opening to the outside should mean the driver stays at a safe temperature (being driven sensibly of course!!!). You're more likely to have issues with cone loading because the air load will be very different on the two sides of the cone. I'm watching this with interest because I have a very similar design waiting to be prototyped. |
Posted By: Jake_Fielder
Date Posted: 07 April 2008 at 12:05pm
|
Yeah, i cant wait to find out what happens either! It'll be a few weeks yet though because i need to get a proccessor and an amp & ply (str3000 & ultradrive) so i need ~£700 first, unless i can get some friends to go in on an amp with me?
Or:
If anyone has all of the following let me know:
I might put a message in the wanted section nearer the time, or at least when the cab is built. |
Posted By: _djk_
Date Posted: 07 April 2008 at 1:53pm
|
Here is my idea of a ported horn:
The 35hz port added about 7dB from 40hz to 50hz. The system is used with a Q=2 filter at Fb=35hz (you will have to mentally add the EQ).
A Q=2 is 6dB of boost, I wouldn't try more than this on your project.
This is a mod to a commercial very small bass horn (that sounds like it has no bass) with a single 15.
After the mod it justs pounds in the low end!
------------- djk |
Posted By: Disco Stu
Date Posted: 07 April 2008 at 3:00pm
|
That looks like the sort of plot I want.
How big is this box DJK? Any hint of a manufacturer or box model? Stu ------------- All you need to know is: Sensitivity + Power Handling - Power Compression = Max Output My acts: www.myspace.com/thebowiexperience www.myspace.com/scheisseelektronisches |
Posted By: Jake_Fielder
Date Posted: 07 April 2008 at 3:04pm
What are the dimentions roughly? that is a good efficency and lower cutoff for a small box, i just wondered how small?
|
Posted By: JaKe
Date Posted: 07 April 2008 at 3:34pm
|
Back to the heat, if for example you were to lay a HD15 type box on it's side (with the magnet in the throat chamber), as the magnet gets hot the air will rise past it as it warms up and more will be drawn in from below. The warmed air will then travel along the top of the box and a good portion of it will go out of the box, fresh cool air will be drawn in from below. If the magnet is in the rear chamber with a long port then I don't think this effect will be nearly as effective. As far as drivers in sealed chambers are concerned I put some 15XB's in some Martin115's that had previously been in some bandpass boxes and ran them with a smaller amp than had been used with th BP boxes (same model just a lower power version) and burnt out the VC's on the drivers during the first nights use, they had been in the BP's for years (with bangin SP23 techno), also speaking to one of the designers at Fane he said you will not get the advertised power handling by a wide margin if you stick the speakers in small sealed chambers. For the use you have mentioned ie heavily compressed bangin techno all nighters then sealed rear chambers or poorly vented ones are going to start limiting your output due to power compression and reduced long term thermal power handling. JaKe |
Posted By: Jake_Fielder
Date Posted: 07 April 2008 at 3:38pm
|
I assumed that as the front chamber is physically higher than the mouth and most of the horn length, it would be the same either way round, whats your opinion on cehardens post about vibrating air cooling? |
Posted By: JaKe
Date Posted: 07 April 2008 at 3:52pm
|
Vibrating are I would think will aid in cooling but the heat will stay in the box and so the air will just get hotter and become less effective with time. Withe the magnet in the throat chamber you have a much bigger and expanding opening which will allow for the convection cooling more effectively. JaKe |
Posted By: ceharden
Date Posted: 07 April 2008 at 4:03pm
|
Surely in a ported horn, both sides of the driver has a air path to the outside world so it doesn't matter which way round it's mounted? |
Posted By: Jake_Fielder
Date Posted: 07 April 2008 at 4:24pm
|
Perhaps i should tweak the design so the driver can go in either way then meausure the temp over time in either way to see if theres a difference,
also it may just happen that with one way round the drivers is closer to my modle than another way round....? so i can try both. although there may not be enough room for that.....
|
Posted By: Disco Stu
Date Posted: 07 April 2008 at 5:53pm
Bearing in mind kick horns appear to push a lot of air out of the box with every movement of the driver, if the magnet is in the throat chamber one would 'assume' with all that air being pushed out, its also pushing the hot air coming from the rear of the driver away more efficiently If I am getting my BP theory right, the port is only working at very low frequencies below the cutoff of the horn so the heat would only get pushed away efficiently from that chamber if the driver was having to reproduce those low frequencies all the time. Would you concur with that? I don't know for sure, its just an assumption. Stu ------------- All you need to know is: Sensitivity + Power Handling - Power Compression = Max Output My acts: www.myspace.com/thebowiexperience www.myspace.com/scheisseelektronisches |
Posted By: Jake_Fielder
Date Posted: 07 April 2008 at 6:19pm
|
At the tuning frequency the driver will hardly move (i picture it that every movement is being opposed by the delayed pressure change in the rear chamber, but JaKe described what was happening better.) so there is no air movement in the horn mouth, and loads of air rushing through the port.
Any higher than the tuning frequency and the horn mouth will have loads of air movment, and the higher the frequency gets the less the driver will "see" the port.
The higher frequencys on my hornresp plot is the same as if there is no port.
|
Posted By: Disco Stu
Date Posted: 07 April 2008 at 6:48pm
|
Which would back up what I said about there being more benefit in having the magnet in the throat
Stu ------------- All you need to know is: Sensitivity + Power Handling - Power Compression = Max Output My acts: www.myspace.com/thebowiexperience www.myspace.com/scheisseelektronisches |
Posted By: tommysb
Date Posted: 07 April 2008 at 7:38pm
|
Been modelling this in AkAbak.
If you take the chamber behind the driver at 85L, the port as 80cmlong, and with a cross section of 5cmx60cm, you get a resonance at apporx 33Hz ;)
Driver excursion goes a bit nuts about 52Hz with 700W(ish) in, (1.1cm) but then drops right off at the tuning frequency 33Hz, so a bit boost could be applied there, I think that's the idea right?
  |
Posted By: Jake_Fielder
Date Posted: 07 April 2008 at 7:44pm
|
Im just going to post my plot again to compare:
|
Posted By: Jake_Fielder
Date Posted: 07 April 2008 at 7:45pm
|
ARSE now its on a new page....
|
Posted By: Jake_Fielder
Date Posted: 07 April 2008 at 7:52pm
|
Hmmm they not too disimilar... the efficiency looks generally the same, the dip @ 130/140 on hornresp seems to be at 70ish on akabak,
Excursion is worrying!
 |
Posted By: Jake_Fielder
Date Posted: 07 April 2008 at 8:06pm
| It seems like AkAbak recons the tuning is slightly lower than Hornresp. I think once the folded port has been accounted for, the tuning will be even lower. |
Posted By: JaKe
Date Posted: 07 April 2008 at 8:34pm
|
Gotta get my head around the Akabak thing and model my cab's, notice the new addition to the latest release of HornResponse about the port being inside the horn? The excursion looks good to me - making full use of the excursion capabilities of the driver at a reasonable voltage input, should be a good match for a STR3000 with 2 drivers per channel assuming your using something with 14mm + xdam. You need roughly 4 times the power to double the excursion of the driver. JaKe |
Posted By: Jake_Fielder
Date Posted: 07 April 2008 at 8:47pm
|
30mm p-p i think, brilliant,
this seems to be alright!
im redesigning the shape to unfold the port, so the real life prototype is nearer what i have modeled, i'll be back later with plans,
(but first i have to fix my brothers bands active midtop, it fell over in the wind at a festival and is playing at about 20% volume....?)
|
Posted By: Jake_Fielder
Date Posted: 07 April 2008 at 8:48pm
wow i didnt know that! i may take a look later
|
Posted By: JaKe
Date Posted: 07 April 2008 at 8:53pm
|
Don't get to excited, it says don't bother trying it as it won't model it hence Akabak. JaKe |
Posted By: Disco Stu
Date Posted: 07 April 2008 at 11:01pm
|
Why not port the thing around 40Hz rather than 30, that will reduce the extension somewhat but improve the excursion around 50Hz.
Stu ------------- All you need to know is: Sensitivity + Power Handling - Power Compression = Max Output My acts: www.myspace.com/thebowiexperience www.myspace.com/scheisseelektronisches |
Posted By: Jake_Fielder
Date Posted: 07 April 2008 at 11:38pm
|
Im tempted to but i think i'd get more use out of it and prefer it dropping that low, than being able to put 700w into it,
i'll see what it does when i build it, i might EQ it down a bit at 50Hz because theres a hump there anyway, then hopfully i wont play too many 53Hz sine waves @ 700w
 Will i be able to hear the distortion before it reaches xmech?
|
Posted By: Disco Stu
Date Posted: 08 April 2008 at 12:27am
|
Probably not, but if you are reaching Xmech and not getting enough output, you should be using a different driver, design or number of cabs. As always I would use the age old classic of, don't put any more than 500W in - the difference between 500-700W is minimal. I know you might end up testing it to destruction but, for the sake of about 1dB is it worth the risk.
Stu ------------- All you need to know is: Sensitivity + Power Handling - Power Compression = Max Output My acts: www.myspace.com/thebowiexperience www.myspace.com/scheisseelektronisches |
Posted By: _djk_
Date Posted: 08 April 2008 at 2:24am
|
"That looks like the sort of plot I want. How big is this box DJK? Any hint of a manufacturer or box model? " http://forums.klipsch.com/idealbb/files/ls_bass_mod.jpg - http://forums.klipsch.com/idealbb/files/ls_bass_mod.jpg
With external HF components:
http://www.bd-design.nl/contents/media/last_roll_-_1.jpg - http://www.bd-design.nl/contents/media/last_roll_-_1.jpg ------------- djk |
Posted By: Jake_Fielder
Date Posted: 08 April 2008 at 9:58am
|
If i knock 52/53Hz down 2dB then the excursion will drop by a few mm right?
How can i calculate how much it'll drop by? Do i model it with 2dB less watts into it, to see the predicted excursion at 52/53 after EQ?
this is in no way supposed to be a cab that you put a signal into and it works perfectly, its going to need some serious EQ!
Im expecting something like:
+12dB @ ~33Hz
-2dB @ ~52Hz
V steep high pass filter @ 30Hz
|
Posted By: Jake_Fielder
Date Posted: 08 April 2008 at 11:11am
I didnt explain myself very well, i ment that for testing purposes would i hear when i have exceeded xmax? just to know its limits.
I would never purposefully use it beyond xmax, i probably wont put more than 500w in anyway, it just turns to heat!
|
Posted By: Disco Stu
Date Posted: 08 April 2008 at 11:58am
|
With horns you should hear very little but since this is a short horn you might start to hear some complaints from the driver, although it may get masked by the port and the port noise.
Who knows, id just go easy on the power and cut 50Hz by 3dB and boost at the port frequency instead. Stu ------------- All you need to know is: Sensitivity + Power Handling - Power Compression = Max Output My acts: www.myspace.com/thebowiexperience www.myspace.com/scheisseelektronisches |
Posted By: Jake_Fielder
Date Posted: 08 April 2008 at 12:03pm
|
Yep, sounds like a good idea stu, could i assume that cutting by 3dB will roughly half the excursion, or soes it not work like that?
thanks for your help
|
Posted By: JaKe
Date Posted: 08 April 2008 at 12:08pm
|
To double the excursion you need to double the voltage which would equal quadruple the power. JaKe |
Posted By: Disco Stu
Date Posted: 08 April 2008 at 2:02pm
So its just essentially a W bin? Great! ------------- All you need to know is: Sensitivity + Power Handling - Power Compression = Max Output My acts: www.myspace.com/thebowiexperience www.myspace.com/scheisseelektronisches |
Posted By: Jake_Fielder
Date Posted: 08 April 2008 at 2:10pm
| So -6dB will half excursion? |
Posted By: JaKe
Date Posted: 08 April 2008 at 2:16pm
|
-6dB power will half the excursion, not -3dB. JaKe |
Posted By: Jake_Fielder
Date Posted: 09 April 2008 at 9:41am
|
Does anyone know the calculation to find out if a port is big enough? I need to make sure my port (300cm2) is big enough for the air speed to be less than 5% speed of sound. How do i find out the port air velocity? model it in winisd?
|
Posted By: Jake_Fielder
Date Posted: 15 April 2008 at 7:09pm
Been playing on sketchup for a few minutes and got this, the outer dimentions and panels are all correct, but i couldnt be bothered to make the correct angles for the horn mouth. so its just a rough diagram:
 Thats without the port folded, i might make it like that, i havent decided.....
|
Posted By: Disco Stu
Date Posted: 16 April 2008 at 12:39am
|
Id stack them all on their side so that the ports are all in line vertically, duno whether ports together or ports apart would be the best option.
Stu ------------- All you need to know is: Sensitivity + Power Handling - Power Compression = Max Output My acts: www.myspace.com/thebowiexperience www.myspace.com/scheisseelektronisches |
Posted By: Jake_Fielder
Date Posted: 16 April 2008 at 8:21am
| I'd have thought ports apart and horns together would be best, because the ports will be lower frequency and so will couple at a greater distance. Tbh i havent worked out how to spin a cab round to stack it any other way yet! that was my first ever 30mins of sketchup. |
Posted By: jethrocker
Date Posted: 16 April 2008 at 7:02pm
|
Use the rotate tool... make sure you select the whole cab, not missing any parts, if you're done with the sketch it's best to group it as a component, otherwise you end up with modern art. Select it all, click on a corner, then another to choose the plane you'll rotate in, then flip her over. |
Posted By: Jake_Fielder
Date Posted: 17 April 2008 at 6:14pm
Which is best? 
|
Posted By: Jake_Fielder
Date Posted: 17 April 2008 at 6:15pm
|
Or:  I recon its the first one....
|
Posted By: Disco Stu
Date Posted: 17 April 2008 at 6:22pm
|
I dont know but you may find the extra width the ports provide in the 2nd example tricks the cab into believing the mouth area is larger than in the first one. Also coupling the ports like in the 2nd example may do something to their combined output.
Only way is to test and see. You could always try the BFM V-plating method (see his site) for some additional dBs, and maybe some extension. I am surprised other people don't do this with their horn subs, it would work particularly well on boxes like the 1850 for example. Stu ------------- All you need to know is: Sensitivity + Power Handling - Power Compression = Max Output My acts: www.myspace.com/thebowiexperience www.myspace.com/scheisseelektronisches |
Posted By: FarmerWardy
Date Posted: 18 April 2008 at 1:08am
|
what version of sketchup is that, the free one from google? 6 isit? iv begun to get pretty nifty with it,   never gone into serious detail with it. (you can tell with the stasys 3 tops) but i do have quite a large amount of single cabs, so i can mix and match  |
Posted By: Jake_Fielder
Date Posted: 18 April 2008 at 9:17am
The second one looks like things will couple better, even though almost any way they are put they'll couple bacause of the size of wavelengths involved.
With the second one the ports are obviously really close and the horns are ony ~15cm further apart than if they were stacked the first way, so it looks like it'll work better...
But as you say: Only way is to test and see ( / listen)
Yes, i really like that idea, its a good way to get something for nothing! and i would definatly use it if I was doing work for bands and stuff like that, but at partys unfortunatly i think people would prefere a flat stack, if it looks more "hardcore" it obviously sounds better *sarcasm*
Cheers Stu
|
Posted By: Jake_Fielder
Date Posted: 18 April 2008 at 9:22am
| Wardy, thats some mad sketching skills! Yeah, im using the free one. I've only spent about an hour on it so far, but i really want to do the internals of my cab correctly to make a proper diagram of it to post on here. So i'll be spending some more time on it in the future... |
Posted By: ceharden
Date Posted: 18 April 2008 at 9:40pm
| Shame I haven't taken any pics yet but the cab I knocked up today looks rather like those sketches! |
Posted By: tb_mike
Date Posted: 20 April 2008 at 8:42am
| My main concern would be port tuning/termination. Remember that your talking 3.4m - 8m wavelengths in particular. |
Posted By: Jake_Fielder
Date Posted: 20 April 2008 at 9:57pm
Cool, take some pics at some point please!
It seems you beat me to prototyping! i remember you saying you had a ported horn and were interested in the outcome of my design, im too lazy (and poor!)
 |
Posted By: Jake_Fielder
Date Posted: 20 April 2008 at 9:58pm
Sorry (again!) i dont get what you're saying...?
Do you just mean that the tuning could be way off that which i have predicted?
I think im going to need to do some fine ( / rough) tuning once its built anyways....
|
Posted By: Jake_Fielder
Date Posted: 13 August 2008 at 11:41am
|
Hey, i have nearly finished the prototype! i started cutting yesterday. I should have it together by tomorrow (maybe).
I have completly re-designed the port so that its alot easier to build, and it should be eaisier to tune to the right freq.
I'll post details at some point....
I now have 4 working drivers, 1 iffy one, 4 trashed ones (i didnt do it) and 1 recone sitting around.
I need six finished cabs in
 EDIT: actually its exactly one month.
|
Posted By: Jake_Fielder
Date Posted: 19 August 2008 at 10:32pm
Prototype:
  I gave it a quick raz tonight and it seemed pretty good (only 200w into it) im gonna work out the tuning tommorrow and get a mate round with a better amp so i can really try it out.
The port might be too small but the only way to find out is to test it.
|
Posted By: breakdabeat pete
Date Posted: 20 August 2008 at 12:22am
|
thats not the amp i think it is it lovley looking box ------------- ٩(̾●̮̮̃̾•̃̾)۶ |
Posted By: Jake_Fielder
Date Posted: 20 August 2008 at 8:33am
|
unfortunatly so, i purposefully included it in the picture so that people would comment.
Im should have 4/6 ready in a couple of weeks. You can come listen to them!
|
Posted By: Jake_Fielder
Date Posted: 21 August 2008 at 10:07am
|
Meausured impedance plot http://www.freespeakerplans.com/forum/forum_posts.asp?TID=464 - http://www.freespeakerplans.com/forum/forum_posts.asp?TID=464 If anyones interested..... |
Posted By: Mark James
Date Posted: 21 August 2008 at 10:16am
|
aha the impedance peaks and dips might be to do with the small mouth area ie just one cab, maybey it will smooth out in a stack of four or howether many you designed it to be used in. no idea if this is even possible just a thought. Markk. ps did the recone kit and driver go ok????? ------------- insert silly sentence here |
Posted By: Jake_Fielder
Date Posted: 21 August 2008 at 10:51am
| Havent done the recone yet, im scared of it! im building 4 cabs for an event im doing and i have 4 working drivers, so i'll hold off the recon until i start building my another four after the event. I'll be after 4 more recones then aswell so i'll get in contact at some point. cheers |
Posted By: Mark James
Date Posted: 21 August 2008 at 10:56am
|
Oh I wasn't asking with the intention of selling you more, I was just interested in whether you managed to fit it and whether the other driver was ok. hmmmm have you considered doing the same plot with four cabs????? Markk. ------------- insert silly sentence here |
Posted By: Jake_Fielder
Date Posted: 21 August 2008 at 11:23am
|
"Oh I wasn't asking with the intention of selling you more"
yeah i know thatsc cool, i was just telling you my plan!
I will take lots of plots once i have built 4 cabs, but i just needed to do this one so that i could work out the tuning of the rear chamber/port, so i could adjust before i built more. I think that dip is more to do with something im doing wrong, like the way im using the headphone socket out of a lap to to go into my amp.
|
Posted By: breakdabeat pete
Date Posted: 21 August 2008 at 11:33am
|
I hate playing anything off a pc apart from wav files sound so crap:/ ------------- ٩(̾●̮̮̃̾•̃̾)۶ |
Posted By: Jake_Fielder
Date Posted: 02 September 2008 at 12:22am
|
New impedance plot:
http://www.freespeakerplans.com/forum/forum_posts.asp?TID=464&PN=2 - http://www.freespeakerplans.com/forum/forum_posts.asp?TID=464&PN=2
|
Posted By: tv00
Date Posted: 28 May 2014 at 11:09am
|
What happened to this design? last link is dead... |
Posted By: Jake_Fielder
Date Posted: 05 August 2016 at 4:26pm
|
I may as well reply to that last comment 2 years late, as i haven't been on here for years!! The design was really good actually, after this thread the speakers had gone to speaker meets, been listened to by many people, some quite experienced people (possibly just being polite) had only good words to say, they have also done many parties. I sold them a few years ago, but as far as i know they are in working order and are still used sometimes. I keep being tempted to build some more again (6?) and now that my budget isn't so low i could actually load them with some better drivers and certainly build them better 8 years on! but im still fond of the design (i'd maybe tune it 5hz higher also) |
Posted By: Thomas Hosker
Date Posted: 06 August 2016 at 10:48am
|
https://www.facebook.com/photo.php?fbid=10210109039662029&set=a.2470651565173.145518.1218884764&type=3&theater" rel="nofollow - https://www.facebook.com/photo.php?fbid=10210109039662029&set=a.2470651565173.145518.1218884764&type=3&theater ------------- WWW.T8Audio.Com |
Posted By: Jake_Fielder
Date Posted: 08 August 2016 at 12:43pm
|
That's a very nice plot, how big is the cab? Can you post input screen? |
Posted By: Thomas Hosker
Date Posted: 27 August 2016 at 5:06pm
|
Sorry man only just seen this! Cab is 500x750 (700 ish depth) likely to change slightly tho as its tuned. I really like the 500 x 750 sizing. Fits really well in most vehicles and allows alot of set up styles. What size was your cab? Hows it working out? ------------- WWW.T8Audio.Com |