Big Simon
Established Member
Hi All,
I have just recently purchased an Audio Technica USB AP120 Professional turntable, (spec attached) which comes with a built in pre AMP.
https://www.audio-technica.com/cms/turntables/583f30b3a8662772/
I have this unit connected via RCA to a phono switch box (spec attached) but am using this in reverse as i need to connect to 2 x Phono Out sources. The turntable is thus connected into the 'Output to Amp' connection on this box--
https://www.amazon.co.uk/HQ-3-Way-S...8&qid=1527097074&sr=8-1&keywords=phono+switch
I am then connecting RCA cables from AUX 1 and Aux 2 on this switch box to my respective devices.
One is a Pioneer DDJ-RR controller which seems to work fine, the other is a Marantz PM6005 AMP which is were the problem comes in, (see attached spec).
Marantz UK | PM6005
The RCA connection to the AMP is connected into the 'Phono' Audio Out and when i switch the source from both the phono switch box to AUX 1 (Where it is connected) and also to the phono source on the AMP I am getting a bad hum.
When i play the vinyl from the turntable the audio quality is good and drowns out the hum but when it stops the annoying hum is still there.
As the turntable is fitted with a pre-AMP i was wondering is this causing a conflict and should therefore be removed, however.....
When the turntable is off the hum is still there when i have the phono source on the Marantz AMP selected and is connected through to the switching box. (The turntable power is still connected however its switched off on the deck through the circular on switch).
it's a bit like looking for a needle in a hay stack here. My first thought was pre-amp in turntable may be the issue but now im not so sure and dont want to have it removed for no benefit?
Turntable quality is poor when connected into the other sockets, CD, Tuner etc via RCA on the Marantz AMP although the hum is not there.
Would really appreciate the help of anyone on here who might be able to help get rid of this?
Thanks Folks
Simon.
I have just recently purchased an Audio Technica USB AP120 Professional turntable, (spec attached) which comes with a built in pre AMP.
https://www.audio-technica.com/cms/turntables/583f30b3a8662772/
I have this unit connected via RCA to a phono switch box (spec attached) but am using this in reverse as i need to connect to 2 x Phono Out sources. The turntable is thus connected into the 'Output to Amp' connection on this box--
https://www.amazon.co.uk/HQ-3-Way-S...8&qid=1527097074&sr=8-1&keywords=phono+switch
I am then connecting RCA cables from AUX 1 and Aux 2 on this switch box to my respective devices.
One is a Pioneer DDJ-RR controller which seems to work fine, the other is a Marantz PM6005 AMP which is were the problem comes in, (see attached spec).
Marantz UK | PM6005
The RCA connection to the AMP is connected into the 'Phono' Audio Out and when i switch the source from both the phono switch box to AUX 1 (Where it is connected) and also to the phono source on the AMP I am getting a bad hum.
When i play the vinyl from the turntable the audio quality is good and drowns out the hum but when it stops the annoying hum is still there.
As the turntable is fitted with a pre-AMP i was wondering is this causing a conflict and should therefore be removed, however.....
When the turntable is off the hum is still there when i have the phono source on the Marantz AMP selected and is connected through to the switching box. (The turntable power is still connected however its switched off on the deck through the circular on switch).
it's a bit like looking for a needle in a hay stack here. My first thought was pre-amp in turntable may be the issue but now im not so sure and dont want to have it removed for no benefit?
Turntable quality is poor when connected into the other sockets, CD, Tuner etc via RCA on the Marantz AMP although the hum is not there.
Would really appreciate the help of anyone on here who might be able to help get rid of this?
Thanks Folks
Simon.
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