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-   -   trick behind the boom box (http://www.diyaudio.com/forums/subwoofers/135406-trick-behind-boom-box.html)

ravslanka 25th December 2008 05:33 PM

trick behind the boom box
 
hi guys.

i want to know all from you expert guys what is the trick behind

those boom box produced by sony.philips.panasonic etc. i mean to

those midrange got so high fs and instead of that they produce so

much bass.i measured 3-4 woofers salvaged from those boombox.

whose resonant frequecy ranging from 60hz to 81 hz. yet they

produce such kind of bass.i want to know because i want to make

one from one of those drivers.

http://i44.tinypic.com/2ag7n1e.jpg

regards

aznboi3644 25th December 2008 05:55 PM

actually those don't get down very low at all

ravslanka 25th December 2008 07:10 PM

Quote:

Originally posted by aznboi3644
actually those don't get down very low at all

but they do give the feel of heavy bass

regards

ravslanka 26th December 2008 07:55 AM

no replies

breez 26th December 2008 10:26 AM

Punchy and heavy bass is around 100 Hz. No trickery needed other than an equalizer circuit to boost 80-160 Hz band or perhaps a high Q reflex tuning around 100 Hz.

Ron E 26th December 2008 04:11 PM

Quote:

Originally posted by ravslanka
but they do give the feel of heavy bass
Distortion and boosted midbass.

Poindexter 27th December 2008 04:00 AM

Whut these guyz sed.

This is a sort of 'conspiracy' between the makers of boomboxes and the producers of the music.  A little plastic box like that can realistically produce freeks down to about 80Hz, with a little internal equalization.  The pop music producers thus put their lowest frequency content about there (this fortunately is right in the band of kick drum), and roll off below, to minimize blowout and abuse of the system.

Your only misconception is in calling this content 'bass'.  I can see from your question that you are a real guy, looking for real sound, and so you will eventually experience actual bass.  It's this whole other thing from 80Hz thump, a bottom that will show you the size of the world.

I spent decades dissing actual deep bass as the least necessary of the frequency components of true fidelity. In the greater picture, maybe so, marginally, but I have now heard what real bass can do, and once you hear it you will no longer call what boomboxes produce as 'bass'.

Aloha,

Poinz

chris661 31st December 2008 04:22 PM

These "boomboxes" aren't actual subwoofers at all - they are stupid-small boxes with a big, long throw driver in, usually found in cars.

However, I think you mean the ones that come with the surround packages (they use a 6" driver) which go stupid low, but there is so much equilisation involved that it is a good idea to leave well alone, as a subwoofer that sounds good with no equilisation will sound awful with the equilisation that happens in a home-cinema set-up

chris661 31st December 2008 04:56 PM

About those speakers.....

Each of those drivers are 5" (from a local shop)

And 4x that would mean the equivalent cone area of a 10" speaker, so mess around with those for a while instead - you will have more fun with bigger speakers

myhrrhleine 31st December 2008 05:52 PM

at the recording studio, they often use small speakers too so they can mix the sound for boom boxes too.


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