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So do I get it right that the hum setups do hum even if there are no MIDI
devices connected?
There are (from my understanding) two possible sources for what you
describe
as high-pitched hum. Either a ground loop or EMI on the lines from the
interface to the amp/mixer (which does not happen with your speakers
because
they might have a low-omic input, whereas the guitar amp does not and the
inputs you use on the mixer might not).
There is the possibility to try the "plug everything in the same socket/in
different sockets" thing you can try (focusing on the Mac and the amp in
question). And if your power cables to these devices have more than two
connectors, you might disconnect the PE (WARNING! Doing so will disenable
this connector's safety function!).
And there's a workaround. Use a DI.
Rainer
----- Original Message -----
From: "mike feeney" <feeneymike@yahoo.com>
To: <Loopers-Delight@loopers-delight.com>
Sent: Friday, April 08, 2005 5:22 PM
Subject: Re: Audio Interfaces
> Sure thing.
>
> My mac is connected to the US-122 via USB cable. The
> US-122 only has RCA outputs, so I run an RCA cable out
> to my M-Audio near-field monitors. These are powered
> monitors, each with their own power cable. At the end
> of the RCA cables, I have to use a 1/4" plug adapter
> since the monitors have 1/4" inputs. That's my
> typical recording setup, and does not hum.
>
> Broken down:
>
> Mac > usb cable > tascam us-122 > stereo rca cable >
> 1/4" adapters > m-audio monitors. (NO HUM.)
>
> To test it out on a "live" setup, I unplugged the
> monitors and instead ran the rca cable into the 2
> inputs on my guitar amp, which resulted in a nasty
> hum.
>
> Mac > usb cable > tascam us-122 > stereo rca cable >
> 1/4" adapters > fender hot rod deluxe. (HUM.)
>
> I also tried running it into my PA:
>
> Mac > usb cable > tascam us-122 > stereo rca cable >
> 1/4" adapters > Peavey 300W powered mixer > (out
> through line-level monitor output) instrument cable >
> powered Crate monitor. (HUM.)
>
> I even tried it without the Peavey power amp:
>
> Mac > usb cable > tascam us-122 > stereo rca cable >
> 1/4" adapters > powered Crate monitor. (HUM.)
>
> Thanks. All of the above resulted in a nasty hum.
> The only one that doesn't is with the near-field
> monitors.
>
> Mike
>
>
>
> --- Rainer Straschill <rs@moinlabs.de> wrote:
>> Mike,
>>
>> could you detail your setup a little bit more,
>> especially when it comes to a
>> comparison of "setup that does not hum" vs "setup
>> that does hum"?
>>
>> Rainer
>>
>> ----- Original Message -----
>> From: "mike feeney" <feeneymike@yahoo.com>
>> To: <Loopers-Delight@loopers-delight.com>
>> Sent: Friday, April 08, 2005 4:34 PM
>> Subject: Audio Interfaces
>>
>>
>> > I've got a Tascam US-122 audio interface (USB,
>> 2-in,
>> > 2-out + midi in/out). Does the job I need for
>> > recording at home for the most part, but I've been
>> > thinking of using it live. So I tested the whole
>> > layout at home the other day (looping with my Mac,
>> > SooperLooper, and the FCB1010) but I got an
>> obnoxious
>> > high-pitched hum no matter what setup I tried. I
>> > tried running the audio out of the US-122 into my
>> PA
>> > head (which resulted in the hum), and also
>> straight
>> > into my Fender Hot Rod Deluxe 410 amp, and both
>> > situations resulted in the same high-pitched
>> > background hum. I tried different cables,
>> different
>> > inputs, etc.
>> >
>> > When I use the US-122 with my little near-field
>> > monitors, I get no hum. Am I doing something
>> wrong,
>> > or does this not work for reasons to which I'm
>> > oblivious? ;)
>> >
>> > Thanks,
>> > Mike
>> >
>> >
>> >
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>
>
>
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