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Old 26th May 2015, 10:05 PM   #1
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Default How to design a cabinet for (very) small speakers?

I have some 57mm mylar speakers, would like to use them in a portable speaker I can use with my guitar. I will build a simple amplifier inside - power handling of these: 1W. I don't have too much info about them so don't know where to start. I do know the resonance freq. is 400 Hz. SPL graph is attached. I currently have 2 of these but perhaps I could use 4 in a single cabinet. The material for the cabinet will be 3 or 4 mm plywood.
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Old 27th May 2015, 12:07 AM   #2
sreten is online now sreten  United Kingdom
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Hi,

Whilst I find the SPL level hard to believe there is no
real complication to boxes for small drivers, they
are generally oversized due to high driver Q.
Sealed and stuffed 2L to 3L for 4 should be fine.

rgds, sreten.
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Old 27th May 2015, 06:11 AM   #3
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Quote:
Originally Posted by sreten View Post
Hi,

Whilst I find the SPL level hard to believe there is no
real complication to boxes for small drivers, they
are generally oversized due to high driver Q.
Sealed and stuffed 2L to 3L for 4 should be fine.

rgds, sreten.
I wish they would give some info so it would be possible to design a proper box. Q is not given, how do you know to assume it is rather high?
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Old 27th May 2015, 06:31 AM   #4
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Quote:
Originally Posted by space-cake View Post
I wish they would give some info so it would be possible to design a proper box. Q is not given, how do you know to assume it is rather high?
you might consider the 400 Hz resonance freq. point ( WL=86 cm )
400 can be considered also a mass/damping ratio, eg. the speaker is designed
to resonate at that frequency
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Old 27th May 2015, 06:39 AM   #5
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So if I just stick the speakers in a box, they won't have an output peak at that freq?
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Old 27th May 2015, 09:49 AM   #6
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That's just the freq. at where ( when ) the speaker settles ( or just -set ), it's also the point where the speaker absorbs less energy, i.e. it finds its way...!!
Co-incidentally, the Fs is where also the Z peak is centered ( bell shape), so it's a matter of electrical and mechanical Q's.
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Old 27th May 2015, 06:02 PM   #7
Sonce is offline Sonce  Macedonia
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Quote:
Originally Posted by space-cake View Post
Q is not given, how do you know to assume it is rather high?
Almost all small loudspeakers have very high Qts. Peak at 400 Hz (reson. freq) also is indicative of that.
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