Anyone have cabinet construction info for the model 18? I have two Peerless 10" woofers and a BASH 300W amp I'd like to use to build my own.
Not knowing the reference for the 2x10" peerless drivers, building a reflex cube with 25" sides and 4 rubber feet should be plain vanilla. (Slot is 2" on one side from Stereophile)
The Muse was a slot loaded 6th order design - not doubt current modeling software could come up with a simpler - perhaps sealed? solution.
Whatever enclosure design you settle on, I'd suggest at the bare minimum to partition off a sealed section for the woofer. Ask a repair tech at a hi-fi shop about long term reliability of built-in amps on commercial subs - even name brands like B&W, Paradigm, etc.
Whatever enclosure design you settle on, I'd suggest at the bare minimum to partition off a sealed section for the woofer. Ask a repair tech at a hi-fi shop about long term reliability of built-in amps on commercial subs - even name brands like B&W, Paradigm, etc.
831727
Give me a couple of days and I will work up an optimum 6th order vented design for you.
http://www.parts-express.com/pedocs/specs/297-616-peerless-specifications-44357.pdf
Give me a couple of days and I will work up an optimum 6th order vented design for you.
http://www.parts-express.com/pedocs/specs/297-616-peerless-specifications-44357.pdf
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Hi,
6th order vented involves building a 2 order high pass
into the feedback loop of the subwoofer amplifier.
Its not complicated if you know what you are doing.
(The inverting input can be treated as a unity
gain point for standard unity gain filter design).
Typically 6th order is a vented box tuned much lower
than normal, with a peaking high pass coincident with
the vent tuning frequency to bring up that region.
Many alignments are possible, hard to say which is best,
but IMO maximally flat is not a good idea at all, IMO its
best to aim at a slow roll-off of say 3dB/octave* and let
the relatively predictable room gain do its work.
rgds, sreten.
* Down to the vent tuning frequency. IMO a high pass
with Q of about 2 (+6dB peak gain) is about right.
6th order vented involves building a 2 order high pass
into the feedback loop of the subwoofer amplifier.
Its not complicated if you know what you are doing.
(The inverting input can be treated as a unity
gain point for standard unity gain filter design).
Typically 6th order is a vented box tuned much lower
than normal, with a peaking high pass coincident with
the vent tuning frequency to bring up that region.
Many alignments are possible, hard to say which is best,
but IMO maximally flat is not a good idea at all, IMO its
best to aim at a slow roll-off of say 3dB/octave* and let
the relatively predictable room gain do its work.
rgds, sreten.
* Down to the vent tuning frequency. IMO a high pass
with Q of about 2 (+6dB peak gain) is about right.
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Thanks everyone for the input.
Using Jeff Bagby's sub woofer modeling program I came up with both woofers wired in parallel, in a common cabinet of 140L, using 2-3" x 10" ports tuning the enclosure to 24Hz. I'll be using a PE BASH 300 amp. I am somewhat concerned that the net impedance will be about 3 ohms or so.
Using Jeff Bagby's sub woofer modeling program I came up with both woofers wired in parallel, in a common cabinet of 140L, using 2-3" x 10" ports tuning the enclosure to 24Hz. I'll be using a PE BASH 300 amp. I am somewhat concerned that the net impedance will be about 3 ohms or so.
That's not too bad a design.
The Muse was a bit smaller, and tuned a bit lower.
While the driver does have an aluminum ring in the magnetic circuit, it is only effective at reducing distortion at the higher frequencies.
Since you will have a pair of drivers, I would suggest mounting them push-pull (which Muse did not do), and have the slot face forward (rather than the floor as Muse did).
The below 3Ω at certain frequencies may/may not be an issue, I am not familiar with the amp you have chosen.
The Muse was a bit smaller, and tuned a bit lower.
While the driver does have an aluminum ring in the magnetic circuit, it is only effective at reducing distortion at the higher frequencies.
Since you will have a pair of drivers, I would suggest mounting them push-pull (which Muse did not do), and have the slot face forward (rather than the floor as Muse did).
The below 3Ω at certain frequencies may/may not be an issue, I am not familiar with the amp you have chosen.
Thank you for your help Dennis.
So if my design looks OK to you, then I'm just going to go with it. It's simple and relatively compact so it should work well.
So if my design looks OK to you, then I'm just going to go with it. It's simple and relatively compact so it should work well.
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