Sorry - More Brik Qs

Posted by: Alex S. on 31 October 2001

As you may know I'm hunting for Briks.

I don't have funds to go active so I've been hunting for DMS 87-88 vintage.

A 'mint, late model' active pair has been offered so I asked if it were possible to run them passive. Please help me to decipher the answer and help me to ask further necessary questions:

"with the external crossover board,I have the dual
crossover fitted in the previous isobariks."

They are also advertised as having the Keltik tweeter. AFAIK this is a ceramic domed affair. I know Keltic are well loathed but what about the tweeter?

Please help, I need answers quick.

Alex

Posted on: 31 October 2001 by Alex S.

You all fed up with Briks or fed up with me?

If I don't get a response soon I will send down a(nother) plague of smilies!

Alex

Posted on: 31 October 2001 by Greg Beatty

...did you try "the other place"? I couldn't blame you for not wanting to go over there

but there are a few leftover audiophiles from the 70's and 80's who can tell you 'bout Briks.

- GregB

Insert Witty Signature Line Here

Posted on: 31 October 2001 by Greg Beatty

...and they all love Naim over there too

But hey - I DID suggest he try over there. Doesn't Mr. Pig use Briks?

- GregB

Insert Witty Signature Line Here

Posted on: 31 October 2001 by Martin Payne

quote:
Originally posted by Alex S.:
"with the external crossover board,I have the dual
crossover fitted in the previous isobariks."

Well, I don't claim this makes any sense to me either, but just in case you're not aware of the various passive crossover arrangements.

From s/no 6701 onwards the speaker was always delivered in an active configuration - bass/mid/treble inputs on back of speaker, no internal crossover (much like NBL today). The "4 ohm" crossover fits into the stand. (You probably already knew this).

Pre-6701 s/no, they were delivered in either PMS (Pro Monitor System/active) or DMS (Domestic .../passive) forms.

The passive version has two 8 ohm crossovers per speaker. One drives the front-mounted bass, mid & treble unit. The other drives the internal bass, and top-mounted mid & treble.

Speakers from s/no 5575 - 6700 made these two boards available by removing a small panel in the base of the speaker. They can be easily converted from passive to active and back again.

Prior to this, they were not easily accessible, and were located at various positions in the box at various times throughout the production run. At one point I think they were between the two bass drivers (fairly easy to access), but have also been on the inside back panel - very tricky to get to. Would require unsealing the back bass driver which has a reputation for being hard to put back right.

For info, if you can get to the boards, you can wire them separately, and drive them with two stereo amps, which turns them from a 4ohm speaker with 1.7ohm minimum to an 8ohm speaker with 3.4ohm minimum. Nice. Very nice.

Sounds like he's describing the twinned 8 ohm crossovers mounted on an external board??

"Previous"? maybe these are from an older pair? If so, some re-wiring would have been required, as there would have to be six pairs of inputs on the back of the spkr - separately to each of the two bass, mid & trebles.

cheers, Martin

Posted on: 31 October 2001 by Jez Quigley

Hope you get sorted. Mine are from 1991, the xovers are in the stands and are easily removable. They have metal links that enable them to be used passive with one stereo amp, or snipped to bi/triwire, or the xover can be unplugged and removed altogether to go active.

Posted on: 01 November 2001 by Alex S.

As everyone I've spoken to says I must listen to Briks b4 buying them (especially, I fear, with Keltik tweeters in them), and these are in Ireland, then I'll pull the plug on this particular deal.

Meanwhile, somewhere in East Anglia. . .

Alex