LFD AUDIO: Dr. Bews’ design philosophy

Hi Howard. You have ended up only selling LFD amps. What makes them so special and what is their design philosophy please. And no jargon please if you can. Thanks. Ralph.

Dr. Bews reply:

LFD Audio believe that audio Amplifiers can be most easily optimized if the basic amplifier topology is kept as simple as possible. Feedback is generally kept to a minimum, provided the distortion is sensibly low. They don’t accept that very low distortion produces subjective improvements.

Actually it’s preferable to have slightly higher total harmonic distortion that possesses higher levels of lower level harmonics, compared to a lower figure made up from higher harmonics. Also it’s important to have well-designed signal routing and earthling combined with the best selection of high quality passive components.

This philosophy normally produces Amplifiers that may at first appear unusual. Typically the printed circuit boards (PCBs) will be topologically laid out according to the circuit and will always utilize star earthing. Signal routing within the amplifier topology is kept to an absolute minimum when transferred onto the PCB and is typically 5 times shorter in length than an average amplifier.

LFD don’t advocate the use of signal routing on a PCB, since subjective evaluation has established that high quality audio cables exhibit less degradation compared to printed circuit board tracks.

Consequently, it may be found that there is more wiring within an LFD amplifier compared to its immediate competition. Each separate cable assembly is subjectively evaluated to establish the best possible choice. Often single strand cables and multi strand cables will be mixed within a given product.

That should be enough to be getting on with. If not, get back to me via Howard please.