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In Reply to: RE: So, is it safe to surmise that if a preamp has two... posted by popsy on July 20, 2017 at 15:40:27
If the preamp is solid state probably not an issue.
Tube preamps like a to see a higher impedance and most subs are quite low on their input impedance. Parallel that with the input impedance of the power amp and it drops even lower. Get it too low and this will have a tremendous impact on frequency response as well as dynamics, slam.
Find the spec. of your preamp to determine the lowest impedance it wants to see.
Follow Ups:
Hi, kentaja,
How do you determine the overall input impedance if the preamp is seeing two powered subwoofers connected to one pre-out connection and a main power amp connected to the other pre-out connection?
I have a tubed preamp with this setup and although the sound seems pretty darn good, I'd be interested in knowing if the preamp might be operating in the "red" zone.
Regards,
Tom
You will need to know the input impedance of the power amp and sub woofer.Once you know both numbers you can find an on-line calculator to determine the effective impedance of the two in parallel.
If you have a tube preamp it is probably not going to work. You need to know the lowest load the preamp will tolerate and still have good sound.
Edits: 07/22/17
Thanks. I have an online calculator I can use once I get the specs for the onboard power amps of the subwoofers.
I already have everything set up so at this point it may be moot as to whether it should work or not. It does work, and seems to be working quite well. But I'm curious as to how far into the 1:10 buffer I'm running the preamp.
Tom
Actually, all you have to do is try it. If your preamp has two main outputs, it is obviously designed for connecting two amplifiers. I have a Vacuum Tube Audio SP14 Preamp and mine works just fine with my Parasound Halo A21 amplifier connected to one set of outputs and my two Rythmik powered subwoofers connected to the other set of outputs.
All you have to do is try it because you can't hurt anything by trying it. If it sounds fine then you're good to go.
Good luck,
John Elison
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Just because you have a preamp with two outputs does mean you can hook up any old thing to those outputs. One must be careful with the actual load the preamp will see. This is not rocket science just basic electronics. Drop the load below what the preamp wants to see and the sound will be degraded pretty dramatically. If one likes the bad sound so be it.Solid state preamps are far more flexible in this regard than tube preamps.
Edits: 07/22/17
> Drop the load below what the preamp wants to see and the sound will be degraded pretty dramatically.
I don't know why you're arguing with me. I understand electronics, too. I was an electronic technician for years. There is no way you will hurt anything by connecting two amplifiers in parallel to your preamp outputs. If you take the time to read what I wrote you would see that I said exactly what you just said, only in reverse. In other words, I said to try it and see how it sounds. If it sounds good then you're good to go.
My tube preamp sounds great connecting an amplifier and two subwoofers to both sets of preamp outputs.
Try it and find out how it sounds. You can't possibly hurt anything.
Agreed. It is not going to hurt anything to hook it up.
Hi, John,
My setup is basically the same configuration and I've been enjoying it for a few months now. I was just wondering how far into the conventional warning zone, i.e., less than a 1:10 ratio of output impedance to input impedance, I'm operating the preamp. I tried using a tubed buffer stage to effectively lower the output impedance but I didn't like the resulting sound.
Guess I'll just keep on listening to what I have set up and enjoy the music. '-)
Regards,
Tom
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