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Big Project, outstanding outcome
#430309 10/09/18 02:00 AM
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With the help and blessing of Ian and James Tanner, I went down the road of converting my Bryston Model T's from the internal passive crossover to the external PX1 Signature series crossovers.

Ian said that I run the T's so hard and loud and so much power, I'd be well served with going over to the PX1's as they handle a significant amount of power over the internal units. It was decided that it was going to be too costly and potentially dangerous to the health of the T's to ship them back to Canada and then endure the return trip to me in the states. I offered to use my shop here to do the work as I have a lot of cabinet making experience and also electronic wiring expertise.

James found a pair of new PX1's he had on hand which he shipped to me and Ian made up the new triple input plates which were sent along with a good supply of the high end Axiom 12 gauge fine stranded copper speaker wire. I spent three days doing the work along with making up new super duty wiring harnesses with very heavy duty mil spec navy surplus spades, all soldered connections of course.

It was a rather involved project as I had to do some cabinet reworking to fit the new input plates, custom make urethane gaskets and do a lot of internal rewiring. However the final product is beyond anything I anticipated. Not only do the PX1's handle huge power input (these things are huge), but the output level of the drivers is at least two to three times that of the stock internal crossover Model T design. The noise floor is dramatically reduced, I mean it's creepy.... no crackle/pop sound from vinyl records between songs, it's disappeared.... and the detail in the music is amazing. I have never heard such beautiful bass/mid with powerful definition and the upper end is nothing but open air. The instruments are 'in the room'.

A huge thank you to Ian. I am very appreciative of his insight and guidance. This company is truly a step above.

Slim

Last edited by Slimpikins; 10/09/18 02:06 AM.
Re: Big Project, outstanding outcome
Slimpikins #430317 10/09/18 03:04 PM
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The dedicated external cross over idea has me excited to.
Pretty good chance I'll go this route to but with smaller speakers (small room).




Re: Big Project, outstanding outcome
Slimpikins #430318 10/09/18 04:01 PM
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Craig, it looks like you're missing out big time!

The lack of dust and static sounds from vinyl is very puzzling.


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Re: Big Project, outstanding outcome
Slimpikins #430322 10/09/18 06:33 PM
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Puzzling to me too...

TAM

Re: Big Project, outstanding outcome
Slimpikins #430323 10/09/18 07:05 PM
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Slim, are you still putting in 2000W RMS into each T? What is the dynamic capability of those amps? I hope the outboard cross-overs have 12 ga coils or they'll ignite.


A-LFR/1000-8 & 2/500v4x2
1000-3,1500-3
100,160,QS10x2,800,M5x2,M2/3/50v4
Air Force, Freedom
had v2
Re: Big Project, outstanding outcome
Slimpikins #430324 10/09/18 07:32 PM
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The crossover feeds the amp zero load on the amp.


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Re: Big Project, outstanding outcome
Slimpikins #430325 10/09/18 11:59 PM
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Richard, each of Slim's Ts are sinking at least 20A RMS. That current is displaced not only in the speaker but also the cross-over. The coils can act like heaters if not appropriately designed.


A-LFR/1000-8 & 2/500v4x2
1000-3,1500-3
100,160,QS10x2,800,M5x2,M2/3/50v4
Air Force, Freedom
had v2
Re: Big Project, outstanding outcome
Slimpikins #430326 10/10/18 02:29 AM
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I told Ian I was working on a liquid cooled heat pipe mod for the PX1's similar to the M1 monoblocks which yes, are at 2000 watts per channel into 4 ohms with 240 volt/15 amp dedicated inputs.

However, after running the new upgrade for three days now at levels that have not melted the crossover coils, but have sagged the glass on my living room windows and still have not caused the PX1's to get warm to the touch, I am abandoning the heat pipe project.

Re: Big Project, outstanding outcome
Slimpikins #430327 10/10/18 02:34 AM
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The snap crackle pops of the records are not dust. The records are clean; it's just normal typical vinyl lead in to cuts. But it's way down now.... I mean way down. No idea what is going on.

I was speaking with James Tanner on this today, he's perplexed too. He's wondering if this might be due to transients in the signal. OK you engineers out there. chime in.

In fact the entire noise floor is to the point where its almost gone and signal is way up. S/N ratio is so much nicer

Re: Big Project, outstanding outcome
Slimpikins #430328 10/10/18 02:57 AM
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The cooling system is still a good idea because it will prolong the cross-over's life. An even better idea though is to chill the voice coil.


A-LFR/1000-8 & 2/500v4x2
1000-3,1500-3
100,160,QS10x2,800,M5x2,M2/3/50v4
Air Force, Freedom
had v2
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