Design Criteria For External Crossover Box


Does anyone have any thoughts on an 'ideal' design scenario for an external crossover enclosure, one that provides the best sonics?

I'm working on upgrading a pair of Maggie 3.6R's and want to replace the existing crossover boxes with larger boxes that will allow more flexibility for upgrading components, and will also accommodate the internally mounted tweeter x-over which I plan to move.
My thoughts are to use a non-metallic enclosure, maybe from plastic or acrylic, perhaps even wood. However, I'm thinking of utilizimg a large copper EMI/RFI plate, that sits above or below the enclosure and about 2" away from the components. I could then experiment with/without the copper plate, and also bonded/non-bonded to ground.

Or....would it be better to use a grounded metalic enclosure in your opinions? I've seen a company on eBay (via another thread on AG) that can make a copper amplifier chasis...would that approach be better?

Many Thanks for any input.

Rooze
rooze

Showing 2 responses by rooze

Thanks Tim, I did the fuse bypass mod on the weekend and also shorted out the tweeter attenuators, the results were excellent, the sound is more dynamic, but at the same time more fluid and effortless.
I just ordered Cardas binding posts to replace the cheapo maggie posts, that was kind of expensive!
I found a site that sells air core inductors, just wondered if you had an opinion on those, and what you've tried. Also, I'm looking round for caps, I've seen the Solens, and also the Cardas caps (not certain if the Cardas have the right values), wondered what your thoughts were? I don't want to spend a packet on caps, maybe $200 max - is that worthwhile or should I get the cash together for more expensive ones?
I'm going to use Cardas hook-up wire for the internal rewire, not sure if there is anything better out there.
This is exciting stuff - things are starting to sound great!!
Rooze
Thanks Tim, I couldn't help myself, I received the Cardas binding posts from www.dedicatedaudio.com yesterday and just had to install them. The main motive was that it let me remove the shorting wires and use biwire cables with spades. It was a pain in the rear trying to solder inside the crappy x-over box, but after 3 hours and numerous burns - Holy Christmas! Using Sonoran Signatures on the lows and Audio Insurgents on the highs, the bass on these speakers just went into another league!

Looking forward to learning from your experience and working out what to do next.
I read a lot of stuff at the asylum, and one concern is what prompted this thread - the enclosure. I heard people say they had really bad results with metal, wood, plastic - which doesn't really leave many options!!
Others seem to have come up with ways to suspend the components away from the enclosure, someone even talked about having caps suspended on pieces of cotton thread! though I don't know if this was ever tried, others used packaging peanuts!
Oh mamma...

Rooze