![]() ![]() ![]() * There are some very expensive isolation shelves, but a DIY isolation solution doesn't have to cost a lot. So rumble filters which have greater rates of roll-off, such as 12dB per octave or (preferably) more are the best solution, but sadly not always easy to find given the lack of info which many manufacturers release about their products.But it'll cost more to buy a rumble filter or a preamp with one, than it (usually*) does to improve isolation of your turntable. The IEC roll-off (and the DB Systems Subsonic Filter) should make little difference to sound, given that they start at a relatively low frequency below which little musical content exists (except for pipe organs), but the ones starting roll-off at a higher frequency will be more audible, as well as being more effective in reducing feedback and turntable rumble. Probably the cheapest effective solution would be to improve the isolation of your turntable, or move it away from your speakers – the amplifier or phono preamp doesn’t need to be close to the speakers.īetter rumble or subsonic filters, with a steeper slope roll-off, or ones starting at a higher frequency of 50Hz or so with the same roll-off slope (not my choice, but quite common in many amps with ‘rumble’ filters) would also be more effective than the DB Systems filter. for vintage turntables rumble filter is highly recommended so you might consider either add-on or phonostage with. So it might be better to save your money, and try another solution. Preamp is a Classe Audio DR 5 (which does not feature a rumble filter BTW). So to sum up, you’d be hard-pressed to notice any difference in audio with the DB Systems filter, since most of its action occurs below the lowest audible frequency (20Hz) but it might not work that well, since it’s not a very good filter, so may not eliminate your problem. the same roll-off as the DB Systems Subsonic Filter). The price is certainly OK, so they would be something to try, but whether they have enough low frequency roll-off to get rid of your problem, I don’t know – possibly not, since I’ve experienced feedback on phono stages which have the IEC RIAA modification (i.e. Im not sure what slope you need, -12dB/oct maybe too little. A good rumble filter will actually improve the bass response by removing those deep subsonic dynamic swings from the system altogether. And with todays cross over video and music entertainment systems, response down to 10 Hz is common. Whether that’s enough, I don’t know, but it’s quite similar to the IEC’s suggested modification for the RIAA curve, which was never officially taken up, but which some manufacturers have used, and which some electronics designers have used on their phono stages. Similar to turntable rumble filters, basically what you are building. Often part of the recording itself, even the best turntable will reproduce it. The DB Systems subsonic filter effect would be quite basic, as it only provides a 6dB roll-off per octave, and is -3dB 25Hz, so it’ll only be -9dB 12.5Hz. ![]()
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