Again the topic of weight of amps

bdp24:
"Tim deParavicini of EAR-Yoshino says he can predict the bass sound an amplifier produces by looking at the size of it’s transformers."

Good morning,
    If Tim deParavicini of EAR-Yoshino is as smart and knowledgeable as I think he is and heard a good class D amp in the last 5 years, I doubt he still believes or states that.  I believe that's an old quote he made back in the 1990s referring to conventional tube and solid state amps at that time, not more recent class D amps.

Tim

I have great bass - slam, articulation and plumpness, the whole nine yards, and am using a Sony Walkman CD player. Consequently I don’t buy into the theory that the transformer has to be large. 

On account of the fact that our amps don't have output transformers, they tend to be lighter than other tube amps that make the same power. For example our 140 watt amp weighs 36 pounds.

It’s no secret that big honking transformers produce toxic magnetic fields that distort the sound and that transformers produce mechanical vibration that affects everything in the chassis, especially given that transformers are bolted down to the chassis.

If they do the transformer was poorly spec'ed!

Nope, they all do. That’s why it’s important to wrap the transformers in mu metal. Of course you can ignore or dismiss the whole issue. I really don’t care. Even toroidal transformers that supposedly don’t emit magnetic fields do, in fact, leak. Been there, done that.

Hello geoffkait,

    I agree, I don't buy into the theory that the transformers have to be large, either.  The primary reason class D amps have such good bass response is their typical high damping factors, often >1,000, which is directly related to how well an amp is able to control the movement of bass drivers and panels.
    The other bugaboo often mentioned by some is the switch mode power supply (smps) used by some class D amps.   All the class D amps I own have typical linear amp power supplies using toroidal transformers but that's just a coincidence and not intentional, I know from personal experience the smps performs just as well as a power supply on the amps I've heard.

Tim