Swans M1 "Active" Build

Before I start I'll make a full disclosure -- I've never built a pair of speakers before so this is as much about learning as it is about the speakers themselves

I currently have a very large set consisting of a 100W ClassAB Technics SU-V707, KEF Caprice 2 Speakers and various other gear -- I cannot take these around with me as they're just too big. In that respect the Swans (especially if I can integrate a small class T amplifier) seem to fit the bill perfectly.

The Swans M1 kit seems surprisingly good for the cost (£130 + £60 p+p)
This includes all the drivers, ports, crossovers etc..

I can have the cabinets cut locally.

Now, to save space further I'd love to integrate the amplifier into the speaker cabinet -- I've been looking at an LJM designed TA2022 60W @ 8 Class-T amplifier -- I've only heard good things about the Tripath amps so far. I'd have an aluminium backplate cut (or I'd drill it myself) and use that as the heatsink for the amp.

Just a few questions:

1) Will the amp or transformer need shielding in any way to stop EMI interfering with the crossovers or the drivers themselves?

2) Lots of cabinets I've seen are stuffed with loft insulation (pink fibreglass). Obviously I can't cover the amp, so how do I get around it?

3) Do you think the Swans M1 would be wasted on a TA2022?

4) Would the aluminium back plate have to be sealed into place rather than just screwing to keep the cabinet air tight? The cabinet is ported so I don't know if it still needs to be completely air tight everywhere else - I don't know whether I'd be able to make the volume pot. completely air tight either

Thanks in advance! Since I'm new my replies have to be moderated, it takes a while for my replies to show so apologies if my response asks questions that have already been answered etc...

Nick


PS: A Link to cabinet dimensions and driver information
 
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AllenB

Moderator
Paid Member
2008-10-18 11:31 am
1) Will the amp or transformer need shielding in any way to stop EMI interfering with the crossovers or the drivers themselves?

2) Lots of cabinets I've seen are stuffed with loft insulation (pink fibreglass). Obviously I can't cover the amp, so how do I get around it?
I wouldn't recommend sealing a stand-alone device like the Technics inside a speaker cabinet.

WRT the chip, sealing the heatsink to the cabinet may cause the casing to be stressed. Considering that the heatsink may damage the cabinet or its mounting due to heat it should be isolated.

The cabinet is ported so I don't know if it still needs to be completely air tight everywhere else -
Air movement in the port has been tuned, so best if you don't change this too much.
 
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Yes,keep everything independent, it allows more ...more!
So you can change amplification whenever you want ( so you can make your statements and judgements about class A, AB, D, T beta alpha etc.)
About aluminium, that should be used for the front baffle, where the speakers are .
I would keep the crossover circuit outside the box, imagine...:rolleyes:
 
I wouldn't recommend sealing a stand-alone device like the Technics inside a speaker cabinet.
Sorry, should have been more clear -- I want to seal a new ClassT amp into the speaker cabinet -- the Technics AB unit is staying as is, as part of a different set.

WRT the chip, sealing the heatsink to the cabinet may cause the casing to be stressed. Considering that the heatsink may damage the cabinet or its mounting due to heat it should be isolated.

Air movement in the port has been tuned, so best if you don't change this too much.
I know the majority of subwoofer amps are plate amps - are they in a different, sealed chamber to the actual driver?