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Old 12th September 2008, 07:52 AM   #1
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Question Big sound from little speakers?

I need suggestions on how to get BIG sound from little speakers. When I say "big sound" I mean a nice overall flat response with some decent bottom end (decent for a small speaker anyway). I'm not talking about getting high SPL from small speakers, just good sound.

I plan to build a small "boombox" that will mostly be used indoors in a small quiet environment, so I don't mind sacrificing SPL for larger sound.

Also, when I say small I mean small. I would like to keep the driver to 4" max with as small an enclosure as I can get away with.

What are my options? Tiny passive radiators? A small sealed box with active LT?

Driver choices (probably a TB driver)?

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Old 12th September 2008, 10:01 AM   #2
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With such constraint I would be looking at a sealed design, measure it then equalise using lowpass shelving.

Perhaps a fullranger like fostex or CSS fr125s.

Problem is the ears cannot be fooled, it wants to hear big soundstage from big speakers
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Old 12th September 2008, 10:32 AM   #3
tinitus is offline tinitus  Europe
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big sound depends on good driver integration with clean and smooth dynamic, airy and "liquid" midrange...did I forget something
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Old 12th September 2008, 10:35 AM   #4
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> a fullranger like fostex or CSS fr125s

Yes, or for more budget, the Jordan JX92 (if that’s still current)
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Old 12th September 2008, 11:31 AM   #5
poynton is offline poynton  United Kingdom
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I have had a pair of these small speakers (actually badged AKAI) for many years - 25 or so.

http://cgi.ebay.co.uk/VINTAGE-PAIR-R...em220278438304

They have an excellent soundstage and surprisingly good bass for such a small cabinet. and they do go loud.

Don't confuse with the later version with the chipboard cabinet.



Andy
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Old 12th September 2008, 12:04 PM   #6
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Have you considered using a bipole config?

http://diyaudioprojects.com/Speakers.../FE127E_SB.htm

It may be beneficial ... stronger bass w/ some enclosure size tradeoff, AFAIK.
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Old 12th September 2008, 12:46 PM   #7
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Quote:
Originally posted by gainphile
Problem is the ears cannot be fooled, it wants to hear big soundstage from big speakers.
They can be fooled, sort of. I was thinking about using MaxxBass, but the only available consumer MaxxBass hardware I can find is a little too big.

http://www.sonicelectronix.com/cat_i...rocessors.html

Maybe the circuit out of one of those cheap portable speaker systems can be used. Something like this........

http://cgi.ebay.com/Altec-Lansing-in...QQcmdZViewItem

Quote:
Originally posted by poynton
I have had a pair of these small speakers (actually badged AKAI) for many years - 25 or so.

http://cgi.ebay.co.uk/VINTAGE-PAIR-R...em220278438304

They have an excellent soundstage and surprisingly good bass for such a small cabinet. and they do go loud.

Don't confuse with the later version with the chipboard cabinet.



Andy
Those are a little bigger than what I had in mind.

Quote:
Originally posted by kristleifur
Have you considered using a bipole config?

http://diyaudioprojects.com/Speakers.../FE127E_SB.htm

It may be beneficial ... stronger bass w/ some enclosure size tradeoff, AFAIK.
That FE127E sealed bipole is huge!
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Old 12th September 2008, 12:49 PM   #8
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Quote:
Originally posted by theAnonymous1
That FE127E sealed bipole is huge!
That particular bipole is huge - I only meant to introduce the concept.
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Old 12th September 2008, 01:00 PM   #9
DRNB is offline DRNB  South Africa
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I'd go for bass reflex with full 6db BSC.
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Old 12th September 2008, 01:10 PM   #10
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Quote:
Originally posted by kristleifur
I only meant to introduce the concept.
Yes, thank you. This seems like it might be a good choice. The additional driver would take care of baffle step and I could use a LT circuit to compensate for the small enclosure.

I would like to use a TB driver from parts-express, I just don't know which one to pick....

W4-1052SD
W4-657SH
W4-616S
W4-656SC

I'm sure these two are nice, but four of them would cost a bit much....

W4-1320SC
W4-1337SA

The amplifier is going to be class-d, so I can tweak the output filter to adjust for the high frequency roll-off of any of the above drivers.
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