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I'd like to add a few comments on my experience of the filters.I recently auditioned the Black Noise (BN) filters in my system, which comprises a USB DAC and Lavry DA-10 computer front-end, a pair of Ref8.5v2s and ELAC 310.2 jet speakers. I used a BN Extreme down stream of a BPT low-noise balanced toroidal transformer for the front-end components. I used the BN 2500 for the power amps. I cannot add too much more in addition to the claims already on the Nuforce page (posted below), except to confirm that these claims are accurate. On the purely subjective side, the BN filters have cured my digititis, which I have been suffering since I turned my back on vinyl for the CD revolution. Needless to say, I bought the filters immediately. I guess that means that 25% of the investment in my system is in filtering out noise (perhaps this is the most bitter pill of the digital music age to swallow). I highly recommend that everyone who can afford it, have an audition. These babies may cost a bit (bitter pill), but I bet that you may discover like me that your system has great latent potential to give you great joy, yet it has been buried up to it's arse in the noise floor. "With BlackNoise filters in your system, you will notice the following:The music occurs within a deeper silence. With background noise essentially banished, the background itself becomes deeper, revealing details you may not have heard before. Heightened harmonic information improves localization within the soundstage. Instruments and voices will seem to have acquired more “air,” thereby creating a more lifelike dimensionality.The smallest details are more evident. For instance, lovers of solo-piano performance will have an easier time distinguishing subtle embellishments and nuance. On a far larger scale, a symphony orchestra’s sections are more readily identified, even during the most dynamic passages.The soundstage becomes wider, deploying voices and instruments within a deeper perspective.A significant reduction of sonic “veil” results in superior micro and macro dynamics. In short, the system’s significantly cleaner mains power exercises greater control, thus reducing the distortion lesser power supplies impose. Frequency bands become wider, with a deeper, better controlled low end. High frequencies are clearer and more accurate, as exemplified by the tactile qualities of solo voices and instruments, and instrumental ensembles."
Hi Robin,Sorry if it wasn't clear. Here's the system schematized:120V AC > BPT > BN Extreme > Lavry DA10 + Trends Audio UD10 (powered by a transformer that is NOT a swicthing PS)120V AC > BN 2500 > Nuforce ampsThus you can see the front end digital is as isolated as can be. Also, my comments about digititis are limited to the front end only. The Nuforce amps were never lacking, it's just that they are now extremely refined by additional filtering.I have also found that using several large core snap on ferrite chokes on the usb cable has a profound benefit. I also use a quartz optical cable, rather than coax or balanced digital cable. And I use iTunes on a XP laptop using ASIO4ALL with Hardware Buffers @ 0ms, no latency compensation and ASIO sample buffers set to 2048. The Lavry has de-jittering, but every tiny upstream aberration seems to get through anyway; I know that theoretically that shouldn't happen, but empirically it does.Hope this makes it all clear. I am so gratified by this system and I know it couldn't perform at this level without the filters.-Eric