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Multi-Way Conventional loudspeakers with crossovers

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Old 12th September 2008, 01:27 PM   #11
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I just thought I'd toss in with my experience.

I've been working on a smallish ported boombox (16.5"w x 7.5"h x 9"d) powered by an Amp 32. I started out with the W4-1320SC bamboo Tand Bands, but after getting the thing built, I ran across a pair of the CSS fr125s on eBay and swapped them out. Night and day, at least with my configuration. Much more and easier bass. Sound improved even more by the addition of a pair of 1/2" mylar dome Audax tweeters--just gives more top end sparkle.

Of course, I've got some equalization built in, an anjustable low-pass filter on the input made from a .33uf cap and a pot, so I can tune it to the space (needs a lot more bass outside), and a coil, resistor and cap on output to knock down the "shoutiness" a little. Your idea of tweaking the output filter is a good idea, and more elegant than my clumsy methods.

It's been a fun project that has allowed me to get my feet wet in the DIY electronics world and show it off everywhere I go.

--Buckapound
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Old 12th September 2008, 01:35 PM   #12
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Quote:
Originally posted by theAnonymous1

The amplifier is going to be class-d
That's another potential cool feature of bipole - if the amp is 4-Ohm friendly like most Tripaths, you'll "gain" 3dB of sound if you make 4Ohms from two 8Ohm speakers in parallel.
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Old 12th September 2008, 01:54 PM   #13
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Quote:
Originally posted by kristleifur


That's another potential cool feature of bipole - if the amp is 4-Ohm friendly like most Tripaths, you'll "gain" 3dB of sound if you make 4Ohms from two 8Ohm speakers in parallel.
Yes, normally that would be an advantage, but with the amp I am going to use I will actually get less power at 4 ohm due to thermal limitations of the IC.

THD+N = 7%, f = 1 kHz, VCC = 24 V, RL = 8 ohm, 32W
THD+N = 7%, f = 1 kHz, VCC = 24 V, RL = 4 ohm, 25W

Still plenty of power for my needs though.
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Old 12th September 2008, 01:55 PM   #14
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May I ask what amp you're using?
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Old 12th September 2008, 01:55 PM   #15
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Quote:
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-...tem220278438304

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.
Me too I have a pair of these badged Audiojap: I agree, they are really amazing. Very good japanese drivers with huge magnet.
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Old 12th September 2008, 01:59 PM   #16
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Quote:
Originally posted by kristleifur
May I ask what amp you're using?
Texas Instruments TPA3106D1
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Old 12th September 2008, 03:42 PM   #17
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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
I agree, IMHO only way to fool our ears into thinking a small driver is big is to horn load it.

Whoops, we just made a big speaker.
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Old 12th September 2008, 04:04 PM   #18
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Okay, I'll risk saying a four letter word. Bose.

Have you guys checked out the new Bose computer speakers.
Not sure there exact name, but they are like 4x5x6inches, weigh about ... 10lbs each, internal amp powered by 17V@2Amps.

They are quite amazing to me, although the demo I heard only had classical music, but they really were amazing. No sub either.
Big stage for the desk they were on. Great musical Bass too... not just sub woofer tones. (maybe because they had no sub!)

Can't tell much about what the driver is except it can't be big.

Its got two passive radiators too, and I see Bose has patents for apposing PR's to reduce vibration... like they thought of that.

Dr. Bose is really good at compressors, and I think that's likely how they get the big sound.

Yeah, I love to hate Bose too, but I really did respect that engineering effort. They sell for ~$400.

Portlandmike
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Old 12th September 2008, 04:55 PM   #19
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Yes, BOSE is the King of signal processing (not saying that is a good thing). If I ate food as processed as the BOSE sound I would have a coronary in a week.

I'm sure they are using something similar to the MaxxBass technology as well.
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Old 12th September 2008, 05:03 PM   #20
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Quote:
Originally posted by theAnonymous1
Yes, BOSE is the King of signal processing (not saying that is a good thing). If I ate food as processed as the BOSE sound I would have a coronary in a week.

I'm sure they are using something similar to the MaxxBass technology as well.

Actually, I've done serious inquiry into compressors, and Bose's method is really nice in that it does nothing to the signal until its getting near clipping.

they also do a fancy loudness processor though, but its actually quite elegant in that it processes the music that is in a narrow, low frequency band, thus everything from say 120Hz up is clean.

No DSP either, very analog.

If it were food, it would be a process to prevent burning!

m
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