Parasound makes great gear, but it sounds like you have a bad one. I'd have it checked out.
Thanks for the advice guys. I switched the RCA cables at the input jacks, and tried a new cable. Still, only the right channel cuts out.
I also hooked up a different pair of speakers and the problem remained, so the speakers are fine.
But, something is definitely wrong with the HK receiver. I disconnected the a21 completely, and hooked the speakers back up to my receiver. No sound at all. Just muffled noises coming from the sub.
Im just not sure what happened to it. We get a lot of lightning in Florida, but everything is plugged into good quality power strips. The HK is only four years old and has been well cared for. Guess the bright side is I may finally have an excuse to upgrade to something better.
I switched the RCA cables at the input jacks, and tried a new cable. Still, only the right channel cuts out.As in the input jacks on the parasound a21 amp?
That indicates a problem with the amp's right channel. You might want to make sure you have the IC RCA plugs plugged into the jacks all the way. You might also try physically lightly moving the RCA plug/jack back and forth and up and down and check it that affects the sound problem. It could possibly be a bad solder connection inside the amp.
But, something is definitely wrong with the HK receiver. I disconnected the a21 completely, and hooked the speakers back up to my receiver. No sound at all. Just muffled noises coming from the sub.What process, procedure, is required to be followed for the preamp section of the HK to be reconnected to the power amp section of the receiver?
Yes, I switched the IC RCA input jacks on the a21, and the right channel continued to go out.
As to your other question, as far as I'm aware, there shouldn't be any special procedure to use the HK by itself other than disconnecting the external amp (the a21) and reconnecting the speakers. I looked in the manual, but I didn't find anything further than "how to connect an external amp".
If the HK is acting up, there may not be an issue with the a21 (I hope). Perhaps I'll try running an RCA cable directly to the a21 from my oppo 205. If the right channel acts up then, that would definitely indicate a problem with the a21 (perhaps a bad solder as you said).
When you swapped the left and right IC RCA plugs at the a21 the sound problem should have moved to the left ch/speaker of the amp. You said it remained on the right ch/speaker.
Perhaps I’ll try running an RCA cable directly to the a21 from my oppo 205.Good idea. That eliminates the HK from the equation.
As to your other question, as far as I’m aware, there shouldn’t be any special procedure to use the HK by itself other than disconnecting the external amp (the a21) and reconnecting the speakers.Has to be some kind of method.
Try connecting an IC from the PRE OUT jacks on the HK to the MAIN IN jacks on the HK.
Thanks! Running an RCA from the pre out to main in on the HK has it functioning again. With the speakers hooked up to the HK, the system works again (though, it certainly lacks the richness the a21 provided). Sometimes this stuff is still mysterious to me; before I got the external amp, I didn't have to connect anything to the pre out.
Unfortunately, connecting the oppo directly to the a21 has proven that it is indeed malfunctioning. The right channel continues to cut out. I guess I'll have to ship it to Parasound for repair :/
Thanks for your help.
Sometimes this stuff is still mysterious to me; before I got the external amp, I didn’t have to connect anything to the pre out.
From the owners manual:
Main-Amp Inputs and Preamp Outputs: These jacks are normally connected directly to each other with an included jumper. Some devices, such as equalizers and some loudspeaker systems, require connection between the Preamp Outputs and Main-Amp Inputs, in which case the jumpers should be removed and stored in a safe place for future use. You may also remove the jumpers if you wish to connect the Preamp Outputs to an external amplifier, or if you wish to connect another device’s line-level output directly to the HK 3490’s power amplifier for a special application.http://static.highspeedbackbone.net/pdf/Harman%20Kardon%20HK3490%20Stereo%20Receiver%20Manual.pdf
You’re not crazy; same thing has happened to me with my 18 month old A21. Right channel first started crackling from time to time almost 1 year ago. Now the right channel cuts off to real low volume for few minutes & then comes back & them off again. Strange coincidence here 😉
dropped it off today (Sept 29) to authorized repair shop. Please Provide update assuming yours is repaired now. Thanks!!!