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Old 1st January 2013, 11:53 PM   #21
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Sometimes it's more work do get the job done without cheating. Yes I don't like ported bass.
Any ideas for replacing Advent woofers with something modern?
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Old 4th January 2013, 07:23 PM   #22
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The MB Quart PWH 302 works fine in a sealed B&W 801 (clone) cabinet. Two should pretty much knock my socks off.
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Last edited by audiomagnate; 4th January 2013 at 07:28 PM.
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Old 5th January 2013, 01:36 PM   #23
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It looks like I can get a pair of Infinity Reference 1250W (Yes, the power handling IS the model number) for about $100/pair, new in box. Fs = 25.4, Vas = 3^ft (84 liters), Qts = .47, Xmax = 11.5 mm. Close enough?
The newer model 1260w is $59.99 shipped from amazon....

Amazon.com: Infinity Reference 1260w 12-Inch 1200-watt High-Performance Subwoofer (Single Voice Coil): Car Electronics

Just so you know, people are selling them cheap, because they are cheap. The infinity and JBL car woofers have been discussed on here before as viable budget sub options.
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Old 10th January 2013, 11:10 PM   #24
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Well, one of these isn't going to cut it in its present form. My port would be longer than the cabinet is tall, so I'm looking at passives now. I have to add a huge amount of weight to the Dayton 12" passives, .5 kilos, to make the curve look right. That can't be right can it?
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Old 11th January 2013, 03:28 AM   #25
DeonC is offline DeonC  South Africa
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I have to add a huge amount of weight to the Dayton 12" passives, .5 kilos, to make the curve look right. That can't be right can it?
If that is the case, have a look at the Acoustic Elegance passive radiators. They have a much lower Fs and might be much better suited to your box. Start with modelling the PR15-700, and then look at the heavier boys if necessary.

If you can't fit a 15" PR, have a look at the CSS Adjustable PRs, like the CSS APR12 12" Adjustable Passive Radiator.

OTOH, as far as I know you will have to use a PR larger than 12" if your bass driver is 12". YMMV.

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Last edited by DeonC; 11th January 2013 at 03:35 AM.
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Old 11th January 2013, 04:45 PM   #26
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If that is the case, have a look at the Acoustic Elegance passive radiators. They have a much lower Fs and might be much better suited to your box. Start with modelling the PR15-700, and then look at the heavier boys if necessary.

If you can't fit a 15" PR, have a look at the CSS Adjustable PRs, like the CSS APR12 12" Adjustable Passive Radiator.

OTOH, as far as I know you will have to use a PR larger than 12" if your bass driver is 12". YMMV.

Enjoy,
Deon
Those are massive passives! The 700 gram 15" you recommended works very nicely. But how can the air in a 4 by 24 inch tube weigh 700 grams?

Last edited by audiomagnate; 11th January 2013 at 04:51 PM.
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Old 11th January 2013, 05:41 PM   #27
sreten is offline sreten  United Kingdom
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Those are massive passives! The 700 gram 15" you recommended works
very nicely. But how can the air in a 4 by 24 inch tube weigh 700 grams?
Hi,

It doesn't. The PR mass is equivalent to a 15" diameter port with a
suitably huge length to be the same tuning as a a 4 by 24 inch tube.

That works out to be about 28 feet long.

rgds, sreten.

3" flared should work and should fit, much cheaper than PR's, and
here PR's have no advantage, well designed ports are better,
PR's are only really needed in relatively small cabinets.
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Last edited by sreten; 11th January 2013 at 06:05 PM.
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Old 11th January 2013, 06:11 PM   #28
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Won't it be a chuf monster? I get 80 m/s port velocity at 3 in port diameter.
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Old 11th January 2013, 06:23 PM   #29
sreten is offline sreten  United Kingdom
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Hi,

I doubt it. You don't run a system as maximum volume most of the time,
you don't listen to sinewaves most of the time, and most of the time low
frequency levels are relatively low, as most systems can't handle them.

E.g. for a ported 100W 2-way speaker sizing the port for about 20W
maximum is about right, many amateur designs oversize the port.

rgds, sreten.
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Old 11th January 2013, 09:14 PM   #30
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Thanks sreten, I'll give it a shot.
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