Dual pre output? Aleph L clone

[ozcal]

Hi guys ,bought the Pass Aleph L clone from Jim's Audio with relay volume control.
I want to run two power anps : one Rotel Michi RHB10 to power my Gale 401A's and one Connexelectronic IRS2092 kit for subs.
I note that on a lot of valve pre amp designs with parallel outputs have 1k resistors connected between the two left and two right hot pins , is this necessary or advantageous with this solid state design.
Thanks in advance,
Gordon

 

[Zen Mod]

is there any sort of active x-over ?

 

[ozcal]

I am using a Mini DSP 2X4 on the output to the subs only ie the feed for the Gales goes straight from pre to Michi power amp, with a jc2 clone preamp on the output side of the DSP to raise the gain into the sub amp Zen.

 

[aradan]

I am looking for the similar solution. Was thinking whether it is more feasible to dual the dac output or do the conversion on the pre-amp level.

Actually DRV134-135 look like a suitable solution.

You can use two drivers per channel and ground the negative output.

I am still trying to find whether there are any multiplexer solutions which would provide + and + outputs instead of + and -

 

[Chris Daly]

Hi guys ,bought the Pass Aleph L clone from Jim's Audio with relay volume control.
I want to run two power anps : one Rotel Michi RHB10 to power my Gale 401A's and one Connexelectronic IRS2092 kit for subs.
I note that on a lot of valve pre amp designs with parallel outputs have 1k resistors connected between the two left and two right hot pins , is this necessary or advantageous with this solid state design.
Thanks in advance,
Gordon

Hi Gordon

You really need two discrete L R circuits at pre amp level for running
separate speakers / separate amps, I also run gale401A ... lovely speakers,
surprised though you need a sub as the 401a has magnificent bass reproduction.

Cheers / Chris

 

[ozcal]

Hi Gordon

You really need two discrete L R circuits at pre amp level for running
separate speakers / separate amps, I also run gale401A ... lovely speakers,
surprised though you need a sub as the 401a has magnificent bass reproduction.

Cheers / Chris

Big , lightly furnished room with lots of hard surfaces Chris. My original pair of Gales in the UK with standard UK sized lounge room had great bass but this second pair in my current room need augmentation. The dual subs are Isobaric in nature and were designed for music rather than ht use. The subs add more lf slam but I still need to work on integration..
Cheers,
Gordon

 

[Zen Mod]

leave output to Gale amps untouched , buffer (either with simple R or active buffer) output leading to bass section

 

[ozcal]

Thank you for your help Zen , would you mind explaining how to implement a simple R buffer on the sub output?

 

[Zen Mod]

R buffer is nothing else than simple resistor in series , to dampen/isolate things a little

things - interconnect cable/next stage input impedance

say that your proposed 1K is good enough

 

[ozcal]

Thank you Zen , So 1K resistor in series with the hot pins of the output for the subs?
Sorry bit of a newb at this.

 

[Zen Mod]

yup

 

[ozcal]

yup

TA

 

[aradan]

What about the current loss, when outputs are paralleled?

Would it not affect the performance

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[Eric]

leave output to Gale amps untouched , buffer (either with simple R or active buffer) output leading to bass section

Zen: For clarity, is this an adequate example of an active buffer?

 

[Zen Mod]

certainly.

or you can go with B1 -like ( decrease series resistor on output) - it's using less unobtanium one of a pair - 2SK170BL

2SJ74BL is much costlier

LS ones from DiyA Store are your safest bet

 

[Eric]

Thanks for the confirmation, just wanted to make sure there was a good example!

 

[aradan]

You can try salas dcb1 it has psu and b1 buffer on board

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