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orrino 17th August 2012 07:33 PM

Suitable Driver advice for use in a small volume box ??
I want to build a pair of full range speakers but the box has to be quite compact it cannot exceed about 7 to 8L volume: smaller is a plus.
The driver must be capable of working well using little power as they will be run using a TA2020 D Class amp, so maybe 12W
They will be used in a 9 X 8 boat cabin.
Ready plans would be a plus for the box design but not necessary.
Most of what I listen to is Relaxed Jazz and Female Vocalist and a bit of Piano.
Most of my music is in FLAC files.
My maximum budget for drivers is about 200-250 at a stretch.
I have loads of plywood and mdf around the house.

Melo theory 17th August 2012 07:50 PM

Madisound Speaker Store

Sealed, 8lt -3db 70Hz.
Qtc .75

I figure you want something water and moisture resistant.
Hence the sealed enclosure and non paper cone with no phase plug.

orrino 17th August 2012 08:02 PM

I like and am happy to use paper drivers, but moisture resistance would be good as a precaution!

sayrum 17th August 2012 08:06 PM


Originally Posted by orrino (
I like and am happy to use paper drivers, but moisture resistance would be good as a precaution!


the alp10 in the above link have a metal membran, nada paper!

Melo theory 17th August 2012 08:07 PM

What are you looking for?
Does it need to go low?
Do you want sealed or vented?
Is off axis important?

orrino 17th August 2012 08:22 PM

I can't imagine getting anything small to go really low.
I would like hear some bass but it doesn't have to be really low.
I think ported would probably be better.
Off axis would make the speakers more useful in the boat situation.
I love detail and mid range.

Melo theory 17th August 2012 08:31 PM

Well, personally, I wouldn't port a speaker any higher than 30-40 Hz. Or else you will here the port ringing through the midbase.
I would get the alpair 10 and do an aperiodic enclosure. You could make it 6lt box and still have a butterworth alignment. With a -3 at 70 Hz. With cabin gain, I'm guessing -3 at 40 Hz.
If you want better off axis response, you will need a smaller driver, but then you give up sensitivity and or extension.

zman01 17th August 2012 08:53 PM

Maybe Alpair 7 (4") or Alpair 6 Metal (3") - you can find quite a few plans here:

Frugal-phile | Box Library / Mark Audio

orrino 17th August 2012 09:28 PM

Jason, thank you for your help, I am a little green in the area of speaker building, I have only ever built one pair of speakers and they are Audio Nirvana 15" cast drivers in the 5.6 ported box.
Dose the butterworth alignment mean additional electronics?

Melo theory 17th August 2012 09:45 PM

No, not in this case.
We are talking about the box alignment.
Basically, its a flat response with a 2nd order slope. (12db per octave)
Q of. 707
I personally prefer a critically damped alignment, but that requires a large box.
You will get a little bump in midbase with butterworth, but not to much with a corner frequency this high.

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