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| Anyone willing to help? Need dual pre-outs to my Don A. Pre http://www.dcaudiodiy.com/phpBB3/viewtopic.php?f=4&t=555 |
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| Author: | dkalsi [ August 6th, 2015, 12:57 pm ] |
| Post subject: | Anyone willing to help? Need dual pre-outs to my Don A. Pre |
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? |
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| Author: | Roscoe Primrose [ August 6th, 2015, 1:06 pm ] |
| Post subject: | Re: Anyone willing to help? Need dual pre-outs to my Don A. |
There's a bunch of us who can help with that.... Where are you located? Roscoe |
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| Author: | J-ROB [ August 6th, 2015, 1:25 pm ] |
| Post subject: | Re: Anyone willing to help? Need dual pre-outs to my Don A. |
You can also use a Y adapter. |
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| Author: | Stuart Polansky [ August 6th, 2015, 1:29 pm ] |
| Post subject: | Re: Anyone willing to help? Need dual pre-outs to my Don A. |
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. |
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| Author: | dkalsi [ August 6th, 2015, 1:38 pm ] |
| Post subject: | Re: Anyone willing to help? Need dual pre-outs to my Don A. |
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 |
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| Author: | Roscoe Primrose [ August 6th, 2015, 1:42 pm ] |
| Post subject: | Re: Anyone willing to help? Need dual pre-outs to my Don A. |
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 |
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| Author: | dkalsi [ August 6th, 2015, 1:44 pm ] |
| Post subject: | Re: Anyone willing to help? Need dual pre-outs to my Don A. |
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. |
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| Author: | Stuart Polansky [ August 6th, 2015, 1:58 pm ] |
| Post subject: | Re: Anyone willing to help? Need dual pre-outs to my Don A. |
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? |
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| Author: | J-ROB [ August 6th, 2015, 2:24 pm ] |
| Post subject: | Re: Anyone willing to help? Need dual pre-outs to my Don A. |
Input Z on the Plinius is a remarkable 100k. |
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| Author: | dkalsi [ August 6th, 2015, 2:26 pm ] |
| Post subject: | Re: Anyone willing to help? Need dual pre-outs to my Don A. |
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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