Build cabinet for Peavey 18" Low Rider Subwoofer

rhythmzdj · 2013-08-20 10:39 pm

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 · 2013-08-22 2:19 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 · 2013-08-22 3:33 am

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 · 2013-08-22 3:58 am

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

LineSource · 2013-08-22 6:32 am

Jsixis said:
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 · 2013-08-23 12:05 am

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 · 2013-08-23 4:33 pm

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

freddi · 2013-08-24 2:27 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
http://img72.imageshack.us/img72/825/gaussbracing.jpg

one built and loaded with JBL

An externally hosted image should be here but it was not working when we last tested it.

freddi · 2013-08-27 3:43 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 · 2013-08-27 6:22 pm

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

freddi · 2013-08-27 9:35 pm

the Karlson may have lower distortion than the little tapped horn - but might have a bit higher cutoff as the rear chamber and system tuning will pretty much dictate the low end

SIDEWINDER 18X · 2013-08-30 9:50 am

rhythmzdj said:
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

Hi,
I had build quite a few boxes in the past for Peavey 18" Low Rider. (Kindly open attached folder to view plan). It performed very well. I had even compared it with original QW118. The results were quite similar.
I had even tried the dual 18 design, QW218. All I can say It was the best sounding Peavey lows that I had ever heard. I mean both the designs, single & dual.

SIDEWINDER 18X · 2013-08-30 1:34 pm

With reference to the attached box dimension for the Peaver 18" low-rider in my previous post #12.
I had drawn a 3-d drawing of the box here again which might be of some help understanding the internal bracings and the port area.

wg_ski · 2013-08-30 8:29 pm

SIDEWINDER 18X said:
I had even tried the dual 18 design, QW218. All I can say It was the best sounding Peavey lows that I had ever heard

Of course. The QW's are on the expensive side for a PV cab.

rhythmzdj · 2013-08-30 9:45 pm

thanks SIDEWINDER that is what i was looking for ,will give it a go

SIDEWINDER 18X · 2013-08-31 4:23 pm

rhythmzdj said:
i will purchase 2ea Peavey 18" Low Rider.

Before you purchase the Low-Rider's, I would like to inform you that there are three generations of Low-Rider 18 produced by Peavey. All of these were marked with the same model no. (1808-8 HPS). All differ on the cones fitted with.
The earlier one had a Progressive m-roll surround / light weight composite fiber-glass smooth cone (American cone).
And the second one had a progressive two roll asymmetrical surround / heavy weight composite kevlar ribbed cone ( European UKM cone) . You can identify this one stamped UKM along with the cone no. at the rear of the cone.
Present generation Low-Rider 18 has a similar kevlar-ribbed / medium weight American cone like the UKM one. Both these ribbed cone sounds and performs better than the earlier smooth one.
As for my opinion the second one, the one with the European kurt-muller (UKM) cone is the best of all.
You can see both of these in the attached pics.

rhythmzdj · 2013-09-05 6:08 pm

awesome info Sidewinder ,when i purchase will ask ,and make sure not getting older generation

LineSource · 2013-10-28 8:28 am

WinISD plots with T/S data:

GREEN: Early Peavey LowRider-18 with 163 gram Mms smooth cone. Note 7.8 ft^3 box.

ORANGE: Latest Peavey LowRider-18 with 198 gram Mms ribbed cone. Note 12.8 ft^3 box.

PURPLE: Beyma 18LX60v1 for comparison. Note 12.6 ft^3 box.

Typical comparison of box volume vs. bass F3 vs. SPL efficiency

SIDEWINDER 18X · 2013-10-28 1:02 pm

LineSource said:
WinISD plots with T/S data:
GREEN: Early Peavey LowRider-18 with 163 gram Mms smooth cone. Note 7.8 ft^3 box.
ORANGE: Latest Peavey LowRider-18 with 198 gram Mms ribbed cone. Note 12.8 ft^3 box.

Do you also have a graph on the ribbed UKM cone low rider, which came just after the early Peavey low rider with the smooth American cone ?.

AlexQS · 2015-04-16 7:30 pm

Correct application?

SIDEWINDER 18X said:
With reference to the attached box dimension for the Peaver 18" low-rider in my previous post #12.
I had drawn a 3-d drawing of the box here again which might be of some help understanding the internal bracings and the port area.

Hi, I'm planning to build a high sensitivity speaker to be used with my moderately low power (40 wpc) amp.

I have the 100 to 20000 range covered.

The peavey 18 low rider offers a high SPL 1m/1w and feels like it may be a good choice to cover ~30 to 100Hz.

How do you think this would work with only 40 watts in a small room?

Also, if my goal is to keep the bass as tight and musical as I can, is a small ported box better than a large ported box? (I know that choosing a different woofer designed for a sealed enclosure would be best, but I'm trying to save the cost of buying additional amps, and LT, etc for now). BTW, music only, no home theater use. Rock, jazz, not much if any hiphop.

Please share your thoughts.

Build cabinet for Peavey 18" Low Rider Subwoofer

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