Lucky you.
At what ambient temperature, with which type of music and what is high level for you?
If the heatsinks only get moderately warm, you probably perceive <1 W average as high level, which could well be. Many people overestimate the amount of W needed for loud listening.
The Cryolites are 8 Ohm speakers. If they were 4 Ohm, you would not have had a lot of fun with your amplifier, whatever the heatsink. Twisted Pear Audio sells it for 8 Ohm loads for a reason.
A 22 V transformer will give you rails that sag to ~26,5 V, when loaded. That relaxes the situation a little to a worst case dissipation of 74 W per channel. Two LM4780 on one heatsink of that size looks like pushing your luck however. Even the Overture Design Guide recommends 0,89 K/W per IC, and that includes insulation washers and thermal grease and is known to be stretching the limits already.
At what ambient temperature, with which type of music and what is high level for you?
If the heatsinks only get moderately warm, you probably perceive <1 W average as high level, which could well be. Many people overestimate the amount of W needed for loud listening.
The Cryolites are 8 Ohm speakers. If they were 4 Ohm, you would not have had a lot of fun with your amplifier, whatever the heatsink. Twisted Pear Audio sells it for 8 Ohm loads for a reason.
A 22 V transformer will give you rails that sag to ~26,5 V, when loaded. That relaxes the situation a little to a worst case dissipation of 74 W per channel. Two LM4780 on one heatsink of that size looks like pushing your luck however. Even the Overture Design Guide recommends 0,89 K/W per IC, and that includes insulation washers and thermal grease and is known to be stretching the limits already.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.