Build cabinet for Peavey 18" Low Rider Subwoofer - diyAudio
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Old 20th August 2013, 09:39 PM   #1
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Default Build cabinet for Peavey 18" Low Rider Subwoofer

i will purchase 2ea Peavey 18" Low Rider , need help with box size and ports would like to be at least 32" high x 24" wide x 24" deep to stack qsc hpr153i on top each subwoofer . will cross at 100hz or 80hz . would like to have sub go as low as 35hz and still hear it . i have two sp118 now with black widow 1801-8 speakers now only go dow to 40hz as per specs
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Old 22nd August 2013, 01:19 AM   #2
Jsixis is offline Jsixis  United States
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you should use a program and make sure that that speaker will work in that size box.
It should work as my EV S18 subs are about that size set up as a 6th order band pass
(how bose copyrighted 6th order band pass is dumbfounding)

Are you sure you can hear 35hz?
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Old 22nd August 2013, 02:33 AM   #3
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The first table of box designs is from the Peavy Low Rider 18 documentation.


The second SPL plot is from WinISD of a 0.707 ported cabinet, and a sealed cabinet that has an active Linkwitz equalization circuit set to 20Hz with Qts=0.7.
Sealed woofers with digital room equalization are becoming more popular for homes(small room relative to bass wavelengths), and clubs or recording studios where a flat response is important.
Attached Images
File Type: jpg LowRider18 Box.JPG (181.5 KB, 294 views)
File Type: jpg Peavy Port SealedLinkwitz.JPG (193.1 KB, 283 views)

Last edited by LineSource; 22nd August 2013 at 02:46 AM.
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Old 22nd August 2013, 02:58 AM   #4
Jsixis is offline Jsixis  United States
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wow that sealed box is very impressive.
is that at 1 watt?
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Old 22nd August 2013, 05:32 AM   #5
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Quote:
Originally Posted by Jsixis View Post
wow that sealed box is very impressive.
is that at 1 watt?
As the sealed box + Linkwitz Transform simulation illustrates, it takes 1-watt to produce 96db SPL at 50Hz, it takes 10-watts to produce 96db SPL at 30Hz.


A Linkwitz Transform equalization circuit uses large amounts of amplifier power to extend low frequencty bass when the speaker is in a modest volume sealed cabinet. A sealed box has the potential to produce better controlled bass with lower group delay and lower phase variation when compared to ported(bass reflex) cabinet, but it is less efficient. A ported box is more efficient and will deliver higher SPLs at equivalent power.


Sealed bass boxes are becoming popular for home audio for their "tigher" bass, and greater simplicity for digital equalization to cover: personal hearing needs, room eqalization, loudness boost (ISO226 FletcherMunson), complex Xovers.
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File Type: jpg LinkwitzEqual AmplifierPower.JPG (243.3 KB, 266 views)
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Old 22nd August 2013, 11:05 PM   #6
Jsixis is offline Jsixis  United States
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thanks for the explanation. I'll have to research Linkwitz Transform I think I read about it on here a few months back but it didn't sink in.
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Old 23rd August 2013, 03:33 PM   #7
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I not farmiliar with active Linkwitz equalization circuit , what about just cab with electronic crossover .I can high pass amp
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Old 24th August 2013, 01:27 AM   #8
freddi is offline freddi  United States
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if its for PA-DJ work then a Karlson may work - lowrider doesn't have the strongest motor qes-wise - the rectangular indications on the side view of this drawing are pockets for handles.

plan for Cetec-Gauss 5181 K18 Karlson coupler
http://img72.imageshack.us/img72/825/gaussbracing.jpg

one built and loaded with JBL
Click the image to open in full size.

Last edited by freddi; 24th August 2013 at 01:30 AM.
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Old 27th August 2013, 02:43 PM   #9
freddi is offline freddi  United States
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you could plug the parameters into this THAM18 input window in hornresp and see how the Lowrider fares

Martinsson's Blog - THAM18 proposal (DEVELOPMENT RELEASE ONLY!)
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Old 27th August 2013, 05:22 PM   #10
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THAM18 Oh Yeah bigger is always better in a cab , I will try this
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