Is the Bose Acoustimass xover as delicate as they say it is? - diyAudio
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Old 28th October 2003, 03:49 AM   #1
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Default Is the Bose Acoustimass xover as delicate as they say it is?

I have a customer that has a set of 5 Bose double cubes (the original size, not the smaller ones), but no Bose sub to use for the internal crossovers. Can I set the receiver's high pass at like 100 or 120hz and be safe, or is there more to it than that? I have talked to Bose "techs" who say that the crossover is some super special thing and if you don't use it you WILL blow the drivers...

(Of course I would prefer that he use the cubes as door stops, but sometimes it isn't that easy....)

What's the TRUE doctrine?
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Old 28th October 2003, 03:59 AM   #2
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make computer speakers out of 'em, usng the JBL 12-watt amplifier on ApexJR. Only needs a 12v transformer, it has its volume and tone knobs on the board.
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Old 28th October 2003, 04:23 PM   #3
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That's not quite the answer I was looking for. Basically I need to know if it is safe to cross them over using the built-in x-over in a receiver, and if so, what frequency?
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Old 28th October 2003, 04:59 PM   #4
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are you operating the speakers near maximum rated power?

it'd be more informative if you had more info on why the crossove is so super-special.
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Old 28th October 2003, 05:03 PM   #5
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i know from experience that if you unplug the cubes, you can hear voices through the bass module. so the cubes are crossed over pretty high. might not be able to just use the cubes.
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Old 28th October 2003, 06:15 PM   #6
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Yes, I have also noticed the voices out of the bass module, and I wasn't sure if that's because it's crossed over so high, or because the module is only on a 6db/octave slope or something.

They are going to be in the guy's home theater, so I am sure they will be running at pretty high volume levels.
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Old 28th October 2003, 07:34 PM   #7
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I know this is short of specifics but I read that the crossover is high but with a very steep slope: 180Hz or 200Hz and 6th order (36dB/oct) seems to ring a bell. The cubes produce very little bass so the XO needs to be high and the sharp slope is to mitigate localisation of the sub.

I wouldn't run the cubes at more than 10W or so if you only had a 80Hz XO on them. Try it - carefully - and see when distortion becomes evident.

Nice one,
David.
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Old 28th October 2003, 08:19 PM   #8
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Default Don't expect any miracles

Yeah, I don't think your friend will have any luck with the cubes. He might as well hang some cone tweeters from some coathangers for that matter.
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Old 28th October 2003, 09:06 PM   #9
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The XO is somewhere up around 250 Hz. You'll probably blow the cubes with a conventional sub XO. As well, the stock XO probably contains some EQ to get the cubes to play that low so they would sound even worse than normal without it (if that's possible.)

http://www.intellexual.net/bose.html

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Old 29th October 2003, 06:45 AM   #10
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Now THAT'S the stuff I needed to hear! Yeah, I am not a fan of Bose, at least not anything made in the last decade or so. Looks like I'll have to help this guy let go of the cubes and move on to something better (and probably much cheaper).

Thanks for the insights!
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