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rhythmzdj 20th August 2013 09:39 PM

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

Jsixis 22nd August 2013 01:19 AM

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?

LineSource 22nd August 2013 02:33 AM

2 Attachment(s)
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.

Jsixis 22nd August 2013 02:58 AM

wow that sealed box is very impressive.
is that at 1 watt?

LineSource 22nd August 2013 05:32 AM

1 Attachment(s)

Originally Posted by Jsixis (
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.

Jsixis 22nd August 2013 11:05 PM

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.

rhythmzdj 23rd August 2013 03:33 PM

I not farmiliar with active Linkwitz equalization circuit , what about just cab with electronic crossover .I can high pass amp

freddi 24th August 2013 01:27 AM

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

one built and loaded with JBL

freddi 27th August 2013 02:43 PM

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!)

rhythmzdj 27th August 2013 05:22 PM

THAM18 Oh Yeah bigger is always better in a cab , I will try this

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