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Old 3rd August 2013, 03:33 AM   #1
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Default B&W Acoustitune

My thrift store trolling buddy just found a passive sub that indicates on the back that it had four options for vent length. Did they sell these with all four vents, which twist on? This one has the shortest. Nice looking 7" cast basket rubber surround drivers, double chamber bandpass, probably isobaric. Thanks
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Old 12th August 2013, 05:13 PM   #2
troystg is offline troystg  United States
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They did have different ports for various room placements. VERY nice find.
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Last edited by troystg; 12th August 2013 at 05:13 PM. Reason: spelling
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Old 13th August 2013, 05:07 PM   #3
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Indeed! https://www.google.com/url?sa=t&rct=...50500085,d.b2I

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Old 14th August 2013, 02:11 AM   #4
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Thanks GM. Now to fashion the other three vent lengths and check it out!
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Old 17th November 2013, 07:43 PM   #5
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Any life left in the thread?
I'm in process of maybe getting this sub for PC audio enhancement.
Currently use sony ta-fe 910r amp and a pair of b&w dm 601 s2 speakers.

Is this sub a plug and play unit, so it could occupy the secondary output pair on the amp, while the primary would still power the 601's.
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Old 17th November 2013, 09:01 PM   #6
sreten is online now sreten  United Kingdom
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Hi,

Passive subs are hardly ever plug and play and are hard to
integrate with any decent speakers, all you get its lots of
bass where they overlap with the decent speakers.

Don't get me wrong, it may work well with B&W's
smaller lifestyle speakers, but not so well with 601's.

rgds, sreten.
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Old 3rd December 2013, 02:55 AM   #7
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Quote:
Originally Posted by sreten View Post
Hi,

Passive subs are hardly ever plug and play and are hard to
integrate with any decent speakers, all you get its lots of
bass where they overlap with the decent speakers.
That's not quite how these subwoofers work. They are plug and play. apparently the integrate very well with speakers like the B&W DM601 and LS3/5A.

You connect them to the main output from your amplifier and they have an internal crossover which splits the bass and higher frequencies. You connect your normal speakers to output terminals on the subwoofer and there is a crossover between subwoofer and main speakers avoiding the overlap you describe. The corssover frequency appears to be around 110Hz.

The different length tubes allow you to match the output of the sub to the sensitivity of the main stereo speakers.

I have two of these subwoofers but haven't unpacked them yet (recent purchases).

I intend to use them a bit differently as a stereo pair driven by a separate amplifier with an electronic crossover splitting the signal between the main speakers (B&W DM7) at 80Hz and the subwoofers.

One of the subwoofers requires a bit of TLC before I can do this so things are on hold for a couple of weeks.

When I have had time to sort things out I shall report back.

Sarah
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Old 3rd December 2013, 04:56 PM   #8
troystg is offline troystg  United States
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Quote:
Originally Posted by AudioWomble View Post
......
I intend to use them a bit differently as a stereo pair driven by a separate amplifier with an electronic crossover splitting the signal between the main speakers (B&W DM7) at 80Hz and the subwoofers.......

Sarah
Are you planning to bypass the passive xo?
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Old 3rd December 2013, 06:35 PM   #9
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Not to start with. I'll see how it sounds first.

The internal crossover is set to a far higher cutoff than the signal will be restricted to by the external crossover so it shouldn't cause too many problems.

Sarah
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Old 4th December 2013, 11:17 PM   #10
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Thanks for reminding me about this one...I have too many speakers obviously. I did note upon looking inside that the drivers are much nicer alloy basket pieces than is typical for bandpass subs.
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