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<blockquote data-quote="Lisa Lane-Collins" data-source="post: 11006" data-attributes="member: 2967">Using a Zone 4 controller in an installation, notice there&#039;s an irritating high pitched buzz in the system, prominent at 9.4, 10 kHz but there are frequencies lower in that.The signal chain is, working back from the amp, amp to mini DSP, mini DSP to zone controller, buzz box to DI, DI to pc. I systematically unplugged the components of this chain until the sound stopped and that didn&#039;t happen until the zone 4 was out. Plugging the zone 4 input straight into the miniDSP also fixed the problem however then I lose my user friendly zone controller so that isn&#039;t really a solution.Wondering if anyone else has had this kind of experience before? Is it a faulty unit? Is there a work around? Do I need another buzz killing thing between the zone controller and the miniDSP? Is it reasonable to expect it to work and sound better out of the box? I was under the impression Apart was a good brand.This is the 3rd time I&#039;ve tried implementing the zone controller in this set up, twice it&#039;s gone back under warranty because there was bleed between the channels. The first time they replaced the unit, I&#039;m not sure if it was replaced the second time but I&#039;ve just gotten it back and plugged it all in and it&#039;s not exactly up to standard.I&#039;ve fixed the agitating high pitched hum for now using the parametric EQ in the miniDSP but the &#039;noise&#039; still there, it&#039;s by far the noisyest piece of equipment in the chain. And I am interested to hear back from people.</blockquote>

[QUOTE="Lisa Lane-Collins, post: 11006, member: 2967"] Using a Zone 4 controller in an installation, notice there's an irritating high pitched buzz in the system, prominent at 9.4, 10 kHz but there are frequencies lower in that. The signal chain is, working back from the amp, amp to mini DSP, mini DSP to zone controller, buzz box to DI, DI to pc. I systematically unplugged the components of this chain until the sound stopped and that didn't happen until the zone 4 was out. Plugging the zone 4 input straight into the miniDSP also fixed the problem however then I lose my user friendly zone controller so that isn't really a solution. Wondering if anyone else has had this kind of experience before? Is it a faulty unit? Is there a work around? Do I need another buzz killing thing between the zone controller and the miniDSP? Is it reasonable to expect it to work and sound better out of the box? I was under the impression Apart was a good brand. This is the 3rd time I've tried implementing the zone controller in this set up, twice it's gone back under warranty because there was bleed between the channels. The first time they replaced the unit, I'm not sure if it was replaced the second time but I've just gotten it back and plugged it all in and it's not exactly up to standard. I've fixed the agitating high pitched hum for now using the parametric EQ in the miniDSP but the 'noise' still there, it's by far the noisyest piece of equipment in the chain. And I am interested to hear back from people. [/QUOTE]

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