I would recommend a topaz Isolation transformer. My reference power conditioners were in the 4-8k range and for a couple hundred bucks on ebay I bought an isolation transformer. The transformer is more neutral and lowers the noise floor by 136-146dB. I now own three of them and couldn't live without. I recently listened to the Tripoint Audio Spartan $35k power conditioner in the designer's system and honestly didn't feel that it was any better than my isolation transformers.
The problem Chang using ferrite in a power conditioner is while it removes noise, it limits dynamics dramatically. The only real way to treat power is to use a capacitor bank with very high-voltage high-speed caps, or to use an isolation transformer. The Tripoint spartan uses magnetic technology and an enormous capacitor bank (caps are $90+ each) to filter the sound. No mumbo jumbo there. But when I can find an isolation transformer on ebay for $200... it's a no brainer.
The problem Chang using ferrite in a power conditioner is while it removes noise, it limits dynamics dramatically. The only real way to treat power is to use a capacitor bank with very high-voltage high-speed caps, or to use an isolation transformer. The Tripoint spartan uses magnetic technology and an enormous capacitor bank (caps are $90+ each) to filter the sound. No mumbo jumbo there. But when I can find an isolation transformer on ebay for $200... it's a no brainer.