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Old 2nd June 2013, 05:26 PM   #1
Colin is offline Colin  United Kingdom
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Default Bass unit for shallow enclosure

I'm looking for a bass driver for use in a shallow enclosure. It will form the woofer/s for a pair of satellite speakers which are being run as bedroom system.

The satellites run to 150Hz or so and the woofer enclosure will take over from there. The whole system is wall-mounted. I appreciate that 150Hz is a little high for a sub system but that won't be critical for the intended use.

The woofer enclosure will hang on the wall between the two satellites so I'd like them to match in terms of depth. Here is a brief spec of what I'm looking for:

Extension - down to 50Hz

Sensitivity - not critical as the unit will have it's own amplifier

Size - diameter not critical as the system will be run at relatively low level. Average listening levels in room, 2-meteres from the satellites is around 65-70 dB, peaks at 80dB.

Enclosure - I'm thinking closed box. There is 20-30 litres available.

Depth of drive unit - the tricky bit - 2 inches (50mm) from front of chassis to back of magnet.

I would be happy to use a number of smaller drivers to get there if a single driver is not available. Given the output and extension, the diameter of a single unit doesn't have to be too great - around 5 to 8" would be ideal.


I've had a look around but not found anything so far, so I'm opening it up here to see if anyone has found something similar. My next step will be to have a look at some of the available car drivers but I don't require the extreme xmax some of those go in for.

Thanks for any input.
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Old 2nd June 2013, 05:56 PM   #2
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The Mivoc 16 Ω drivers at Strassacker: Lautsprecher - Boxen - Selbstbau are very interesting
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Old 2nd June 2013, 05:58 PM   #3
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Quote:
Originally Posted by Colin View Post
Depth of drive unit - the tricky bit - 2 inches (50mm) from front of chassis to back of magnet.
Thanks for any input.
There seem to be plenty of options at 2.25"-2.5", but at 2" the players thin out to few, if any that fit the rest of your needs.

Standard 2 x 4" construction leaves 3.5" depth, why a 2" limit?
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Old 2nd June 2013, 06:17 PM   #4
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That's a challenge! I've got a pair of JBL GTO802D 8 inch car subs which use a special basket design to achieve low mounting depth, but even they are 110mm deep.
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Old 2nd June 2013, 07:53 PM   #5
Colin is offline Colin  United Kingdom
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The limit on depth is set by the satellite speakers either side - they're 3" deep. I'd prefer to try and keep the bass box the same depth to minimise reflections.

Hence not aiming too low into LF. I realise it won't be possible.

If there is anything in the 2.5" range, I'll take a look at those.
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Old 2nd June 2013, 09:48 PM   #6
Dissi is offline Dissi  Switzerland
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How about a 8" with front motor:

http://www.quint-audio.com/qaudio/files/nsf8-495-8b.pdf
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Old 3rd June 2013, 06:56 PM   #7
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Quote:
Originally Posted by Colin View Post
If there is anything in the 2.5" range, I'll take a look at those.
Dissi's suggestion looks good, at 61mm "overall height" looks to fit.
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Old 3rd June 2013, 07:11 PM   #8
Colin is offline Colin  United Kingdom
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Thanks for that - looks good. Doesn't appear on the Madisound site and goodness knows if it will be obtainable in the UK.

I've discovered a couple of Peerless drivers with depths around 60-65mm.
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Old 3rd June 2013, 08:34 PM   #9
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I'll leave the others to help you with the woofer but you might want to have a look here if you are considering wall mount:

Ever think of building a Cornu Spiral horn? Now you can!

Highly rewarding project and you can decide later if you need a woofer.
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Old 3rd June 2013, 09:01 PM   #10
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I think I missed the part about you already having the satellites.
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