Suitable Driver advice for use in a small volume box ?? - diyAudio
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Old 17th August 2012, 07:33 PM   #1
orrino is offline orrino  Ireland
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Default 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.

Last edited by orrino; 17th August 2012 at 07:39 PM. Reason: Ommition
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Old 17th August 2012, 07:50 PM   #2
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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.
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Last edited by Melo theory; 17th August 2012 at 07:53 PM.
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Old 17th August 2012, 08:02 PM   #3
orrino is offline orrino  Ireland
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I like and am happy to use paper drivers, but moisture resistance would be good as a precaution!
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Old 17th August 2012, 08:06 PM   #4
sayrum is offline sayrum  Germany
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Quote:
Originally Posted by orrino View Post
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!
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Old 17th August 2012, 08:07 PM   #5
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What are you looking for?
Does it need to go low?
Do you want sealed or vented?
Is off axis important?
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Old 17th August 2012, 08:22 PM   #6
orrino is offline orrino  Ireland
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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.
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Old 17th August 2012, 08:31 PM   #7
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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.
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Last edited by Melo theory; 17th August 2012 at 08:38 PM.
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Old 17th August 2012, 08:53 PM   #8
zman01 is offline zman01  Bangladesh
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Maybe Alpair 7 (4") or Alpair 6 Metal (3") - you can find quite a few plans here:

Frugal-phile | Box Library / Mark Audio
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Old 17th August 2012, 09:28 PM   #9
orrino is offline orrino  Ireland
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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?
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Old 17th August 2012, 09:45 PM   #10
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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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