![]() unbalanced thing tends to give me a headache. Would it be worth converting the sound cards'/modules unbalanced outputs to balanced and feeding the DPS12 with that ? If so, what would you suggest I use (other than the Rolls HE18, which can do the conversion, but also have isolation transformers)? The Akai DPS12 that I am using already has balanced inputs. ![]() You can buy those new (with 6.3 mm plugs) starting at 50 bucks. You can also use a audio patchbay with balanced connectors, AFAIK. ĮDIT2 : The impulsive idiot that I am ordered 3 of these Rolls HE18 … 8_Buzz_Off.html ?ī) Is there a better way to fix this than with isolation transformers ?ĮDIT: Disconnecting the MIDI adapter cable from the AWE64 or the Ethernet cable from the NIC changes nothing to the hum. Ī) Why is there an apparent ground loop between devices on the same ground. I intend to get another ground-loop isolator if that is what is required to fix remaining issues 2 and 4. I found 2 Nexxtech branded ground-loop isolators in my stash of parts and installed them on AWE64 and Audiotrix 3D/XG outputs, which completely eliminated the hum on those devices. Ĥ) When I isolate the input used by the component switcher on the DPS12 mixer, select the SC-88 and set a high volume on the DPS12's headphone out, I get ALMOST no discernible hum. ģ) When I isolate the input used by the component switcher on the DPS12 mixer, select the MT-32 and set a high volume on the DPS12's headphone out, I get no discernible hum. ġ) When I isolate either the AWE64 or Audiotrix 3D/XG on the DPS12 mixer and set a high volume on the DPS12's headphone out, I get humĢ) When I isolate the input used by the component switcher on the DPS12 mixer, select the Gravis Ultrasound and set a high volume on the DPS12's headphone out, I get hum. All midi modules are fed from the AWE64's midi port using a joystick MIDI adapter from the 90s and a MIDISPORT 2x4 in passive mode with one out looped-back to input to act as three output MIDI thru box. line outputs on all cards and modules and gain on DPs12 are roughly adjusted to similar volume levels, but below clipping level. The MT-32, SC-88, MU500 and Gravis Ultrasound are connected to the component switcher, which in turn is connected to a dedicated stereo input on the DPS12. The AWE64 and Audiotrix 3D/XG are each connected directly to a dedicated stereo input on the DPS12 Other than b) there are no connections to other AC powered devices. ![]() The DPS12's optical S/PDIF output is plugged into an AVR (hardly ever used). There is an Ethernet cable connected between the PC and and Ethernet switch (switch is on the same circuit, but different outlet). Everything is plugged into the same power bar (MIDI modules, DPS12, PC, monitor, OSSC, HDMI scaler, monitor, component input switcher) I have an Akai DPS12 that I use as a mixer and a retro PC (PC, monitor, OSSC, HDMI scaler) with multiple sound cards (AWE64 Audiotrix 3D/XG and Gravis Ultrasound) as well 3 MIDI modules (MT-32, SC-88 and MU500 ) and a component input switcher.
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