[Previous Message]
[Next Message]
|
| Date: |
August 10, 2003 at 04:45:31 |
| From: |
Adrian Mack, [006.pth0201.pth.iprimus.net.au] |
| Subject: |
Box tuning for Peerless XLS 10 |
|
|
URL: My website, Peerless XLS 12 Dual PR Sub Project, 18LW1400 vented sub, Horns, etc..... |
|
Hi Derek!
> is that 30l or 1.08 volume not including the driver
> and port or is it ?
Yes. Net volume must be 30L, so that means its excluding driver and port.
> what do you think about the dimensions and tuning
> frequency that peerless recommends. which is a 26L
> enclosure and a 70mm port that is 930mm long.
Its OK.
> The enclosure you mentioned that would be tuned to
> 18.9 hz isnt that a little low and if not how long
> is the port too?
Nah - driver resonance is 18.9Hz itself, these XLS ones were made to go real low. In any case, anywhere between 18.9Hz and 22Hz will be best. Essentially, we can use a 30L box and 20Hz tuning and achieve excellant results. Thats the same specifications that I've told many others who have built a Peerless sub designed by me - and I've recieved nothing but excellant feedback from them.
As stated before - this needs EQ. Thats easy to do, and a simple sallen key 2nd order filter can be used for this job. Usually people buy plate amps, and use the EQ circuit in that - but I can give you schematics for what you need to do for a seperate circuit that will work with your Crown amp.
EQ also means is port air velocity increases. The 3" port you wanted is out of the question here - 4" is the minimum that you can use. And when that is so - vent length is 75". As you can see... thats why I reccomended PRs only with this driver. The Peerless website's box ignores EQ - and they've designed for a target of 105db at 25Hz. What they havn't pointed out is that its 7db down at this point, and hence, the EQ is needed. I reccomend 3.5db at 25Hz. In this box, its flat to about 22Hz in-room measured.
How powerful is the crown amplifier into a single bridged channel? Or if it cant be bridged, how much is it in stereo operation? Crown is a prosound amplifier; can it take unbalanced connections as well? Or just balanced? (XLR). This will dictate some of the parts in the EQ circuit.
Adrian
|
|
|
| View the previous message in this thread
Go to the top of this thread
View entire thread |
Posted with TalkShop version
2.74 |
[Previous Message]
[Next Message]
|
|
|
Follow Ups: |
|
|
|
[
The Subwoofer DIY Page - Discussion Forum ] [ FAQ ] |
|
