there's a fair bit of Eq required to get A7's to their best,in the xover - active xovers mostly just don't have this!

Posted by Timbo in Oz (A) on April 24, 2007 at 04:43:15

In Reply to: Altec A7's Active Crossovers.... posted by Cougar on April 23, 2007 at 08:44:47:

Let alone what I call voicing.

The things really are efficient and sensitive enough for passive losses - power and signal wise - to be audibly insignificant given half way decent bits. Esp. in blending Eq and pass band slopes.

If I were you I would follow the suggestion and try finding out about what's been done with more carefully designed passive xovers - for A7's as a family - using modern measurement - and THEN see if anyone has transferred this learning to active circuitry as yet.

I am not persuaded that an active xover, where typically:

only the xover point, gain on either side, and perhaps slopes for both HP and LP, are selectable, and that's it / no EQ, ...... part from asymmetric slopes and YOU'll be lucky finding even a DIY circuit.

That it will necessarily be better than a current 'DIY research' based passive, WITH Eq. built in.

Modelling the transfer function of a passive xover, is only a decent starting point!

You are also adding TWO more gain stages per channel - subject to self-noise and RFI and PSU issues, let alone the basic circuits own limitations, all of which are especially audible with HE spkrs.

It really all depends if you want to go active 'because it's just RIGHT! Timbo!??', or because you really know what is involved in getting there.

Warmest

Timbo in Oz
The Skyptical Mensurer and Audio Scrounger

And gladly would he learn and gladly teach - Chaucer. ;-)!

'Still not saluting.'

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Follow Ups Full Thread

Topic - Altec A7's Active Crossovers.... - Cougar 08:44:47 04/23/07 (18)

Re: Altec A7's Active Crossovers.... - VFR800A 11:07:48 04/24/07 (0)

Re: Altec A7's Active Crossovers.... - STUART 08:15:01 04/24/07 (0)

there's a fair bit of Eq required to get A7's to their best,in the xover - active xovers mostly just don't have this! - Timbo in Oz 04:43:15 04/24/07 (0)

Re: Altec A7's Active Crossovers.... - larry D. Moore 13:50:04 04/23/07 (9)

Nice article - colinhester 07:51:53 04/27/07 (0)

Thank You for the info. - Cougar 17:58:26 04/23/07 (1)

Re: Thank You for the info. - Larry D. Moore 04:32:04 04/24/07 (0)

Or not... better yet, Great Plains Audio or the unofficial Altec website. - eso 14:08:12 04/23/07 (5)

Re: Or not... better yet, Great Plains Audio or the unofficial Altec website. - Larry D. Moore 16:40:46 04/23/07 (4)

If it isn't about Edgar - Pimp Police 02:12:06 04/24/07 (3)

I am unaware of any affiliation between that producer and Great Plains Audio or the unofficial Altec board... - eso 10:19:34 04/24/07 (0)

Re: If it isn't about Edgar - Larry D. Moore 04:33:35 04/24/07 (1)

Please children... - eso 06:22:04 04/24/07 (0)

Hiraga are for A5, different drivers than A7 - eso 10:24:13 04/23/07 (4)

Re: Hiraga are for A5, different drivers than A7 - Cougar 18:17:33 04/23/07 (3)

Re: Hiraga are for A5, different drivers than A7 - eso 21:09:51 04/23/07 (2)

Re: Hiraga are for A5, different drivers than A7 - Cougar 14:42:32 04/24/07 (1)

Re: Hiraga are for A5, different drivers than A7 - eso 18:46:52 04/24/07 (0)

Follow Ups

there's a fair bit of Eq required to get A7's to their best,in the xover - active xovers mostly just don't have this! - Timbo in Oz 04:43:15 04/24/07 (0)

there's a fair bit of Eq required to get A7's to their best,in the xover - active xovers mostly just don't have this!

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