2 general sub questions, please

Misa A. · 21st March 2004, 02:59 PM

Hello, everybody
One more time I am bothering you with my rookie questions.

I am going to build my first active subwoofer with a Peerless 12” XLS. I want it to be small and suitable for both home theater and music (mostly).
Before I begin with my project, I would like to know opinion of experienced subwoofer builders on the following simple questions:

1. Is it better to isolate a plate amp (which is a well known Parts Express 250 W) in a separate volume, or I can place it in the same volume with the driver? I am not concerned about possible leakage or box rigidity which I can take care of, but safety of electronic components and PCBs under a huge air pressure inside a box.

2. Since I am very much concerned about its dimensions, I am inclined to make my subwoofer a passive radiator box of approx 35 liters volume, following Peerless reference design. The question is: can such a system produce accurate bass, good for music applications, or will it sound too loose?

Thank you in advance for answers,
Misha

av_affected · 21st March 2004, 03:33 PM

Misha
Plate amps are made to mount directly in the main enclosure. There's no reason to make a separate enclosure. The air pressure generated inside the sub will have no affect on the amp. Just make sure you take the volume displaced by the amp into account in your box volume calculations.

Passive radiator subs are quite popular. Yes, their group delay is higher than sealed systems and usually higher than similar ported systems, but they can be quite musical. If you're trying to get deep bass in a fairly small box, a passive radiator system is often the only alternative to a ridiculously-sized port or absurd amounts of EQ in a sealed system.

Guss · 21st March 2004, 03:57 PM

If you decide to mount the plateamp in the main enclosure, make sure you mounted it properly and tightly screwed the plate to the baffle. Some electric component may rattle at certain freq and its very anoying.

Misa A. · 22nd March 2004, 05:54 AM

Thank you very much, gentlemen
You gave me good answers and I will go this way.

Misha

21st March 2004, 02:59 PM	#1
Misa A. diyAudio Member Join Date: Dec 2003 Location: Moscow	2 general sub questions, please Hello, everybody One more time I am bothering you with my rookie questions. I am going to build my first active subwoofer with a Peerless 12” XLS. I want it to be small and suitable for both home theater and music (mostly). Before I begin with my project, I would like to know opinion of experienced subwoofer builders on the following simple questions: 1. Is it better to isolate a plate amp (which is a well known Parts Express 250 W) in a separate volume, or I can place it in the same volume with the driver? I am not concerned about possible leakage or box rigidity which I can take care of, but safety of electronic components and PCBs under a huge air pressure inside a box. 2. Since I am very much concerned about its dimensions, I am inclined to make my subwoofer a passive radiator box of approx 35 liters volume, following Peerless reference design. The question is: can such a system produce accurate bass, good for music applications, or will it sound too loose? Thank you in advance for answers, Misha

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21st March 2004, 03:33 PM	#2
av_affected diyAudio Member Join Date: Apr 2003 Location: Great Southwest	Misha Plate amps are made to mount directly in the main enclosure. There's no reason to make a separate enclosure. The air pressure generated inside the sub will have no affect on the amp. Just make sure you take the volume displaced by the amp into account in your box volume calculations. Passive radiator subs are quite popular. Yes, their group delay is higher than sealed systems and usually higher than similar ported systems, but they can be quite musical. If you're trying to get deep bass in a fairly small box, a passive radiator system is often the only alternative to a ridiculously-sized port or absurd amounts of EQ in a sealed system.

21st March 2004, 03:57 PM	#3
Guss diyAudio Member Join Date: Jun 2003 Location: Montreal	If you decide to mount the plateamp in the main enclosure, make sure you mounted it properly and tightly screwed the plate to the baffle. Some electric component may rattle at certain freq and its very anoying.

22nd March 2004, 05:54 AM	#4
Misa A. diyAudio Member Join Date: Dec 2003 Location: Moscow	Thank you very much, gentlemen You gave me good answers and I will go this way. Misha