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Its pretty similar

ESL57s in parallel will work with a solid state amp, but with similar results.

The reason is that on most ESLs, the impedance curve varies by about 9-1 or 10-1 from the bass region to the highs.

So a Sound Lab is about 30 ohms in the bass and about 3 ohms at 20KHz.

A Quad ESL57 is about 45 ohms in the bass and about 4 ohms at 20KHz. This makes it tricky for any solid state amp to make bass on the speaker. As a result, what usually happens is that the speaker winds up being a bit too close to the wall behind it as the owner tried to reposition the speaker to get bass. In a way they will have succeeded- but the speaker will have a sort of 'one note' bass as what is really happening is the backwave is reinforcing at one frequency only.

If you put the speakers in parallel you still get that 10-1 thing.


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  • Its pretty similar - Ralph 09:37:58 04/10/17 (0)

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