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RE: ART9 vs ART7

> I haven't checked with a test record but it tracks through some of my toughest album passages with ease and I see no evidence of subwoofer pumping,

It would be interesting to know your arm/cartridge resonance frequency. I suspect it will be in-between 6 and 7-Hz like mine. You're subwoofers don't pump because they are sealed subwoofers and do not respond to frequencies below 20-Hz. If you had ported subwoofers or servo subwoofers like mine, I'm sure you would experience significant subwoofer pumping with your ART9 compared to other lower compliance cartridges.

Just because you don't experience subwoofer pumping and just because I can use a rumble filter to eliminate it doesn't mean our cartridges are not producing higher levels of intermodulation distortion as a result of their excessively low arm/cartridge resonance frequencies. On the surface my cartridge plays just fine and tracks just fine like yours. However, I know from experience that if I measured intermodulation distortion, it would be significantly higher than other cartridges with resonance frequencies in the 10-Hz region. Therefore, it's not possible for us to know how much better our cartridges might sound if their compliance were properly matched to our tonearms' effective mass.

Best regards,
John Elison


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