2-Way Hi-Fi System Diagram.

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paranoid06

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Joined 2010
#1
Hi all,

I'm working on a hi-fi system for my home listening.
I have an old SONY MHC Series Sound System.
Uses an STK4191.

I hate the sound of that system.
The sound starts booming when i increase the volume.
Before it was my mistake that I had kept the system very close to the wall. Around 1" away from the wall.
Now it as around 8"-9" away from the wall....and it still boom...aargh!

I'm using the Speakers and Tweeters from the SONY System to make my new pair of speakers.
It has
2 x 6" SONY Woofers [6 Ohm each]
2 x 4" SONY Tweeters [4 Ohm each]

BOTH MADE IN MALAYSIA.

My new sound system will have.

24 dB/Octave 2-Way Linkwitz-Riley Electronic Crossover
2 x LM3886 [For Hi frequencies]
2 x P3A [For Low Frequencies]

Now comes the part of the Box-Design.
Added the blueprint of my design idea. Please comment.
This is my first build, so I have NO IDEA whether I'm on the right path or not.

Please guide me further.... 🙂

Thanks and Regards
 

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#2
Hi,

It is true you have no real idea of what you are doing and
the whole exercise will not turn out the way you expect.

Your plans are so misguided its impossible to know where
to start. The amplifier is unlikely to be the problem. Try
bigger boxes with lowered port tunings for boomy drivers.

rgds, sreten.

undefinition (see if nothing else, the excellent FAQs)
The Speaker Building Bible - Techtalk Speaker Building, Audio, Video, and Electronics Customer Discussion Forum From Parts-Express.com
Zaph|Audio
Zaph|Audio - ZA5 Speaker Designs with ZA14W08 woofer and Vifa DQ25SC16-04 tweeter
FRD Consortium tools guide
http://web.archive.org/web/20090902124715/http://geocities.com/woove99/Spkrbldg/DesigningXO.htm
RJB Audio Projects
http://web.archive.org/web/20090902202231/http://geocities.com/woove99/Spkrbldg/
Speaker Design Works
HTGuide Forum - A Guide to HTguide.com Completed Speaker Designs.
A Speaker project
DIY Loudspeaker Projects Troels Gravesen
Humble Homemade Hifi
Quarter Wavelength Loudspeaker Design
The Frugal-Horns Site -- High Performance, Low Cost DIY Horn Designs
Linkwitz Lab - Loudspeaker Design
Music and Design

Great free SPICE Emulator : SPICE-Based Analog Simulation Program - TINA-TI - TI Tool Folder
 
#3
sreten is quite right that you need a bigger box for those bass units to avoid the boom. Maybe some damping material too. You could even plug tennis balls or something in the ports and see if it helps. Typical Sony MHC are speakers with big ports and small boxes by the look of them. You might call them BOOM boxes! 😀

4 and 6 ohms and unknown qualities makes it hard to know where to go. But for sure, if you use a bigger sealed box, that reduces the overall bass peak.

Morgan Jones explains bass resonance very well in his Arpeggio speaker design:
http://www.diyaudio.com/forums/diyaudio-com-articles/158899-arpeggio-loudspeaker.html

See if you can figure out the crossover wiring, which I'd suspect is just a capacitor to the tweeter unit, and whether it is putting the speakers in series or parallel. Also whether the tweeter has its own enclosure. Might be easier to suggest something then. Good luck with this. You can often get quite a good and lively sound with cheapish drive units.
 
#6
24 dB/Octave 2-Way Linkwitz-Riley Electronic Crossover
2 x LM3886 [For Hi frequencies]
2 x P3A [For Low Frequencies]
Click to expand...

So let's see

You've got perfectly flat drivers that extend from 0 to infinity without their own transfer functions, with the same acoustic center and identical sensitivities??????
The above speakers are made in malaysia sony speakers.
You've got an infinite baffle on which to mount these speakers.
You've got different amps with different input sensitivities and gain structures.

Um... maybe you should reconsider.
 
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