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AUDIO FORUMS >> General Discussion and Support >> Series Bridged Preamp?
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Message started by Brian on 11/05/17 at 03:03:24

Title: Series Bridged Preamp?
Post by Brian on 11/05/17 at 03:03:24

I am a little confused about something which is probably obvious.

Some of the Decware single ended power amplifiers use a "Series Floating Output Bridge" to allow bridging to mono without smearing the sound.
If a preamp were made as two circuits bridged in series it might have the drive of the push-pull preamps but with a single ended sound.

But I am wondering: would it then be any different from having a two stage preamplifier?

Brian

Title: Re: Series Bridged Preamp?
Post by Steve Deckert on 11/09/17 at 04:56:20

Since "drive" really is a term that came from an amplifiers ability to deal with complex and difficult impedances from loudspeakers it really doesn't apply the same to preamps. A preamp only has to drive an easy load with very little impedance or impedance that changes very little might be a better way to phrase it.

"Drive" in a preamp really comes from it's voltage swing, the larger the swing, the more drive. Our CSP3 for example has up to 30 volts of potential output with a 2 volt input which is perceived as "drive" when listening because the music is well animated and dynamic.

So there is no reason to create a push pull preamp to create a sense of drive, when it can be easily done single ended.

Title: Re: Series Bridged Preamp?
Post by Brian on 11/10/17 at 02:37:18

Thank you, Steve. I was mistaken in thinking the preamps were push-pull.