Autoformer vs Speaker impedance Curve

Any of the amps that you recommend run 20 to 30 db of feedback!

Bubble still up, your having illusions, or didn’t do your homework.
Two of the amps are "local" and not sound destroying "global" feedback, and are designed to be low output impedance with resorting to global feedback, and have huge reputation for stunning bass and speaker control especially hard to drive ones like these B&W 802d3’s.

I repeat 73max OP, don’t get autoformers for your 802d3’s, unless you have an amp already that’s not right for them and want to use them as an interim band-aid fix, till you get the right amp to do the job, then autoformers are not cheap around $700, better to just put it towards getting the right amp!

Cheers George

Love this forum. The level of knowledge here is amazing!  

Any thoughts on how old is “too old” for higher end SS amps? Still have my eye on the Classé Omega Monos but it’s at least 15 years old (I have the serial numbers and will get exact age).  

Also, where does one find the level of feed back and global vs local for a given amp???  Doesn’t seem like a spec often given by manufacturers. 

Excellent link atmasphere. Great read...I’m on my second time through and taking notes. 

Any thoughts on how old is “too old” for higher end SS amps? Still have my eye on the Classé Omega Monos but it’s at least 15 years old

Will be fine if only used a few hours a week. Unless he was a nutter who left them on all day many times a week.

Also, where does one find the level of feed back and global vs local for a given amp???

Unless stated in the topology description, or by the owner in interviews. The only way to tell is to look at the circuit diagram, which can be impossible to get unless your in the know. Or you could email the manufacturer and ask.

Cheers George