Trevor Wilson wrote:
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** You omitted the *very real* risk of damaging the input power limiter of a Quad ESL63 and any of its relatives.


**Both amps would certainly fry the TRIAC(?), if pushed. If I recall
correctly, the ME850 (maximum output Voltage = 31 VRMS) would not exceed
the maximum Voltage limits of the ESL63? The ME1400 certainly would (42
VRMS). Overkill for the ESL63.


** The ESL63 has two input limiting triggers.

1. A voltage peak value of about 35V using a power transistor or zener array.

2. A simple ionisation detector ( uses a 555 ) trips a triac for a short time.

It's often a 1.5ohm, 5W resistor in series with the speaker that can pop.
Later marks have a fuse to save it.
In any case Quad, warns not to use amps have no VI limiting with their ESLs.


...... Phil