The amp was picking up interference without the Topping ever being involved. Read my latest two or three previous posts.Can you try battery powered notebook to feed the DAC? (instead of mains powered)
OK, it would be best returned to the seller.The amp was picking up interference without the Topping ever being involved. Read my latest two or three previous posts.
If (both of) you read the original post carefully, the interference goes away as soon as I unplug both cables from the amp's input, so the amp is not the problem, it is just amplifying the incoming radio signal.
The amp was picking up interference without the Topping ever being involved. Read my latest two or three previous posts.
Have you tried grounding the amp? You could use one of the unused RCA inputs for this - just connect ring to ground. You'll need to connect it to some equipment that has a mains ground, or if you are confident with electrical wiring of mains plugs, make a wire from the ground pin of an electrical plug (make sure you connect to ground and not live!!!)The interference was even stronger when I moved the Topping away from the amp with the cables still dangling on the amp's input, especially when I held my hand close to them. The placement of the power supply has no effect.
Sometimes it is difficult to get some orientation in similar threads. Are you saying that the input connector is open?? Then the test is invalid. You have to short center pin of the input RCA-CINCH to its sleeve (ground) and investigate if it still demodulates FM. Open input has high impedance and is catching everything from surrounding elmag. fields. It is difficult to participate in threads like this one.There is nothing connected to the amp's single-ended input.
Is your cable at Topping line out connector is TS or TRS.Also, just having any of the cables plugged into the amp's input makes the interference stronger, doesn't matter if I plug a cable into the right or into the left input.
I can still hear the radio station without the cables, but it's much stronger when I plug them in.
It's much much easier to hear it with my IEMs than with my over-the-ear headphones.
I tried editing that older post, the interference does not go away completely when unplugging the cables, it's just not as loud and I hadn't noticed it before.You have a peculiar style of asking for help. Just saying.
So is the amp the problem or isn’t it? The interference goes away if both cables are unplugged but was there without the Topping?
The cables that I'm using are balanced, they are 3-pin TRS.Is your cable at Topping line out connector is TS or TRS.
TS look like this:
TRS look like this:Devinal Unbalanced XLR Male to 1/4" Inch TS Mono Male Plug Audio Connector, 6.35mm to XLR Cable for Amplifiers, Instruments etc.[6 Feet] : Amazon.sg: Musical Instruments
Devinal Unbalanced XLR Male to 1/4" Inch TS Mono Male Plug Audio Connector, 6.35mm to XLR Cable for Amplifiers, Instruments etc.[6 Feet] : Amazon.sg: Musical Instrumentswww.amazon.sg
CableCreation 2M TRS 6.35mm (1/4 Inch) Male to XLR Male Cable, Gold Plated connecto, Professional Series 3 Pin XLR Plugs,6FT : Amazon.sg: Musical Instruments
CableCreation 2M TRS 6.35mm (1/4 Inch) Male to XLR Male Cable, Gold Plated connecto, Professional Series 3 Pin XLR Plugs,6FT : Amazon.sg: Musical Instrumentswww.amazon.sg
TRS tip will save your lots of problems.
The cables are fine, I also confirmed they are truly balanced with each pin going to a separate pin on the other side of the cable, none of the contacts are paralleled.
That's weird. I was going to suggest a power led next to the IR receiver - but it clearly isn't that. Or at least not one that is functioning correctly.Another problem... is this supposed to light up? lol
The thing emitting the red light should the the IR receiver, right? It is emitting visible red light, by the way, it is visible to the naked eye.
IR LEDs do emit a little in the visible spectrum. They don't have the narrow bandwidth of a laser.Another problem... is this supposed to light up? lol
The thing emitting the red light should the the IR receiver, right? It is emitting visible red light, by the way, it is visible to the naked eye.
IR recievers don't though.IR LEDs do emit a little in the visible spectrum. They don't have the narrow bandwidth of a laser.
True, not normally.IR recievers don't though.
If it is reasonably easy to do, get your friend to bring over his unit and plug it into your gear. See if his picks up interference. Then you'll know if yours was a one off problem unit or that something is different about your setup. If his gets interference, I'd try another brand or design.Amazon scheduled with Seur to pick up this amp on Monday. Should I pick up another A20h? A friend of mine bought the exact same amp (because of me) and he told me his unit does not pick up any interference, I haven't had a chance to listen to his amp, though.