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August 6th, 2015, 12:57 pm
Hi All,
New to the DC diy community. I've built a few speakers before, but nothing of my design (only proven design by others).
I have a request which I am hoping a fellow DCAudioDIY member may be willing to assist with.
I have a Don Allen tub pre-amplifier. I really like the way it sounds. I use it with my Plinius SA-100 MKIII amplifier and my Wayne P. Pi3 Speakers. Pursuant to Wayne's recommendation, I want to add "flanking subs" to my system.
In order for me to incorporate stereo subs to my system, I would need a pre-amplifier with dual outputs (one to my main amp, and one to my subwoofer amp). Unfortunately, the aforementioned pre-amp only has one set of outputs.
Is there anyone here that may be willing to help with installing another set of pre-outs to my preamplifier?
August 6th, 2015, 1:06 pm
There's a bunch of us who can help with that.... Where are you located?
Roscoe
August 6th, 2015, 1:25 pm
You can also use a Y adapter.
August 6th, 2015, 1:29 pm
J-ROB wrote:You can also use a Y adapter.
Depending on the output impedance of the preamp, a little FET buffer for the subs might be beneficial. Two low impedance (I assume) SS amps might be quite a load for a tube line stage, if it doesn't already have a low impedance output. But I don't know the equipment being used.
August 6th, 2015, 1:38 pm
Stuart,
My current system consists of the following:
Computer with Lynx Sound Card --> Music Hall DAC 25.2 --> Don Allen tube pre-amp --> Plinius SA-100 MKIII amplifier --> Pi3 speakers.
I'm plan on building flanking subs - will likely use Eminence Lab12 drivers (one on each side).
I was planning on using a pro-amplifier for sub duty, specially like a Behringer EP2500 (or may a QSC PLX3402).
I don't have any knowledge about the Don Allen pre, but can take pictures and upload.
Thanks,
Dhar
August 6th, 2015, 1:42 pm
dkalsi wrote:Stuart,
I was planning on using a pro-amplifier for sub duty, specially like a Behringer EP2500 (or may a QSC PLX3402).
Look for a used QSC USA400, two if you need more power. Cheap, linear power supply, no fans...
Roscoe
August 6th, 2015, 1:44 pm
Roscoe Primrose wrote:dkalsi wrote:Stuart,
I was planning on using a pro-amplifier for sub duty, specially like a Behringer EP2500 (or may a QSC PLX3402).
Look for a used QSC USA400, two if you need more power. Cheap, linear power supply, no fans...
Roscoe
Roscoe,
The reason why I was contemplating using the Behringer EP2500 and the PLX3402 is because I have both on have, and both have been modified with a quite fan mod.
August 6th, 2015, 1:58 pm
Do you have a schematic for the preamp? If not, do you know its output configuration and/or impedance?
Input impedances for the power amps?
Do the power amps have level controls?
August 6th, 2015, 2:24 pm
Input Z on the Plinius is a remarkable 100k.
August 6th, 2015, 2:26 pm
Roscoe,
I do not have schematics of the pre-amp. I'll atleast try to upload pictures.
Please find specs below for my Plinius:
*INPUT SENSITIVITY: 0.8V RMS for rated output at 1kHz.
*INPUT IMPEDANCE: 47kΩ.
Please find specs below for Behinger EP2500:
*INPUT SENSITIVITY (V RMS @ 8Ω): 1.23V (+4.0 dBu)
*INPUT IMPEDANCE: 10kΩ unbalanced and 20kΩ balanced.
Please find specs below for QSC PLX3402:
*INPUT SENSITIVITY (V RMS @ 8Ω): 1.9V (+7.7 dBu)
*INPUT SENSITIVITY (V RMS @ 4Ω): 1.7V (+6.6 dBu)
*INPUT IMPEDANCE: 6kΩ unbalanced and 12kΩ balanced.
All of the aforementioned ampls have Blanaced inputs, but the pre-amp does not have balance pre-outs.
Both pro-amps (i.e., the Behringer and QSC), have level control on the front.
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