Bandpass enclosure

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=52155
Printed Date: May 10, 2025 at 10:29 AM

Topic: Bandpass enclosure

Posted By: oonikfraleyoo
Subject: Bandpass enclosure
Date Posted: March 19, 2005 at 12:12 AM

Ok, I ordered a W7 and FedEx lost it, it's been 3 weeks and today the driver just shows up out of the blue with it. I had written it off as gone and already talked myself into waiting on Adire. Anyway, I slapped a sealed box together quickly (JL's specs) and threw it in the Jeep. Don't get me wrong, it ain't quiet at all, but it just ain't loud enough. If I build a bandpass for it, will it sound like arse? And how much more SPL should I look forward to? And how sensitive is a bandpass when it comes to exact volumes (I wanna make it primarily FG)? I still think I'm just gonna use this to get me by until I can get a set of Brahmas, but that may be a few months.

Is this even the right direction?

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Nik
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Replies:

Posted By: DYohn
Date Posted: March 19, 2005 at 9:44 AM

A bandpass enclosure would be a real waste of a W7 unless you want to compete, and even then there are far better speakers for a BP application. W7 in a proper sized sealed enclosue should sound pretty darn good. If you want more SPL, build a ported enclosure tuned to about 32Hz. How are you powering it?

If you want to build a BP simply because you want to try it out, get a cheap Pioneer or Rockford speaker to play with so if you blow it you won't be out big dollars. And to answer your question, yes a BP enclosure is very sensitive to exact size and proper construction geometry since the whole "box" is just a big port.

Oh, and I don't know what you mean by "I wanna make it primarily FG"? What's FG?

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Posted By: haemphyst
Date Posted: March 19, 2005 at 9:48 AM

Fiberglass? I think...

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

Posted By: oonikfraleyoo
Date Posted: March 19, 2005 at 11:31 AM

Yeah Fiberglass. It's powered by an MRD-M1001 and at 3 ohms I'm guessing it's getting around 750 watts, which is what JL says is optimal. I think I have enough MDF left to build a ported box. I'm gonna go do that right now.

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Nik
Jeeputer Progress
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Posted By: customsuburb
Date Posted: March 19, 2005 at 6:00 PM

Have you messed around with the settings on the amp alot? Alpine's amps seem to be....well...different to set up because of their "all digital" design

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Posted By: oonikfraleyoo
Date Posted: March 19, 2005 at 6:56 PM

Well, about two hours after my last post I had a ported box (also built to JL's specs) and a large grin on my face. The reason I asked about the bandpass was because I just didn't see the ported box making that much of a difference. IT DID. This is by far the loudest single sub system I've ever had and there is little to no SQ difference between the sealed and ported boxes. Now since I have a fear of right angles, I have to transfer this design into a fiberglass box. I'm sure that will be rather challenging, but if wasn't, it just wouldn't be any fun would it?

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Nik
Jeeputer Progress
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