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Old 18th April 2011, 06:22 PM   #1
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Default Quad ESL 57 connection

In twin Quads ESL 57 pannels drived by a Quad II amplifier at 15 ohms output impedance, what is the best connection: series or parallel.
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Old 19th April 2011, 01:43 PM   #2
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Normally, the preferred way to hook them up is parallel. Anyway this is what Quad recommended.

The Quad II is a nice amplifier for one set of ESLs but a bit under powered to drive two sets, be it series or parallel. I'd suggest you try both and see what sounds best to you. Also try with the output wired for 8 Ohms. Better would be to give each set it's own amplifier.

One of my clients has a triple stack of ESLs and he's using the Transcendent OTL mono blocks to power them. A small alteration to the feedback loop was required to get it stable. This was only required with the speakers hooked up in series. He preferred series connection reporting better transparency.
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Old 20th April 2011, 02:04 AM   #3
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Quote:
Originally Posted by arend-jan View Post
Normally, the preferred way to hook them up is parallel. Anyway this is what Quad recommended.

The Quad II is a nice amplifier for one set of ESLs but a bit under powered to drive two sets, be it series or parallel. I'd suggest you try both and see what sounds best to you. Also try with the output wired for 8 Ohms. Better would be to give each set it's own amplifier.

One of my clients has a triple stack of ESLs and he's using the Transcendent OTL mono blocks to power them. A small alteration to the feedback loop was required to get it stable. This was only required with the speakers hooked up in series. He preferred series connection reporting better transparency.
Ok! Maybe better driving it with a Julius Futterman OTL 3 or a Doktor Gizmo New York powers I know, however these amps are hard-to-find nowadays.

I go try too my Quad 303 at 8 ohms.

Many thanks
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Old 20th April 2011, 02:25 AM   #4
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Ok! Maybe better driving it with a Julius Futtermann OTL 3 or a Doktor Gizmo New York powers I know, however is very hard-to-find these amps nowadays.

I go try too my Quad 303 at 8 ohms.

Many thanks
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