|
|
Post by ncred02 on Jul 25, 2014 19:49:27 GMT -5
Any recommendations? I just started getting some bad line noise. System was dead quiet up until a month ago.
Don't want to break the bank and two to four outlets would be plenty
Thanks
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jul 25, 2014 20:38:45 GMT -5
CMX-2 has two outlets and also includes DC offset which the CMX-6 does not. Get one or two. Or get the CMX-6 for the components then connect it to a CMX-2.
|
|
|
|
Post by aud on Jul 25, 2014 22:09:44 GMT -5
Do you know what started the noise?
|
|
|
|
Post by ncred02 on Jul 25, 2014 22:26:54 GMT -5
No. Im more than a little POed about it. Last weekend got so bad it was audible during a movie.
The sub panel and my HVAC system is right behind the system in the attic.
Have had my system here for years and no noise.
Never anything with my XPA2 and still nothing on my XPA3 but with my new amps, plenty.
My be that the A/C is running now and it wasn't when my new amps were introduced into my system in April
|
|
|
|
Post by aud on Jul 25, 2014 22:47:57 GMT -5
Is the noise a hum coming out of all the speakers and is it always there when the system is on?
|
|
|
|
Post by ncred02 on Jul 25, 2014 22:51:46 GMT -5
no just the mains that my RedDragon's are running. The surrounds and CC are on my XPA3 and no noise
|
|
|
|
Post by aud on Jul 25, 2014 23:04:20 GMT -5
Turn your system off. Unhook the red dragons and the xpa3. Now hook up just the xpa3 to your mains. Turn system back on. Still have the hum?
|
|
|
|
Post by ncred02 on Jul 26, 2014 5:16:16 GMT -5
I'm going to try just that this weekend. I love my amps , but cant deal with noise. It may be that class D is more sensitive to interference?
When plugged directly to the wall outlets noise is really bad. When into my panamax, much better, but not gone. Before the summer plugged into my wall outlets direct, dead silent.
|
|
|
|
Post by trinhsman on Jul 26, 2014 6:42:39 GMT -5
Once you've isolated the noice, and if you believe it is the line, Cullen Cable makes an outlet filter receptical that I use. Seems to do a good job for me with my amps. Also it's fairly cheap at 75 bucks.
|
|
|
|
Post by Priapulus on Jul 26, 2014 7:57:26 GMT -5
Modern gear has built-in filtering and is pretty much immune to powerline noise; indeed Emotive recommends their amplifiers be plugged directly into the wall. I would be suspicious of a bad interconnect cable, or a ground loop. Check before you buy any conditioning.
On the other hand, I wouldn't be without surge protection; a $40 Surge Sentry will suffice. You can buy a whole house Eaton surge protector for about $90 at Home Depot.
Sincerely
/b
|
|
|
|
Post by ncred02 on Jul 26, 2014 15:02:27 GMT -5
How would I check the groundloop?
|
|
|
|
Post by aud on Jul 26, 2014 15:29:27 GMT -5
How would I check the groundloop? By methodically disconnecting components. I started you on that path by asking you to swap out the red dragons and replace with the XPA-3. Depending on how that goes, it will lead us to other recommendations.  |
|
|
|
Post by ncred02 on Jul 26, 2014 18:30:37 GMT -5
How would I check the groundloop? By methodically disconnecting components. I started you on that path by asking you to swap out the red dragons and replace with the XPA-3. Depending on how that goes, it will lead us to other recommendations. When I disconnect the amps from the pre it doesn't change a bit. I brought the amps to another system and still the noise. Even with them only plugged into the wall and speakers connected,the same. My xpa3 is dead silent. |
|
|
|
Post by aud on Jul 27, 2014 8:53:11 GMT -5
Did you connect the XPA-3 to the original pre amp, just using 2 of the 3 channels for your mains?
|
|
|
|
Post by Boomzilla on Jul 27, 2014 9:27:40 GMT -5
|
|
|
|
Post by aud on Jul 27, 2014 12:06:47 GMT -5
Good suggestion Boom. I would just add that a lot of these ISOLATION T-formers produce some pretty good mechanical hum so think about mounting it outside of the audio room. Fully agree, forget the MOV products. |
|
|
|
Post by Boomzilla on Jul 27, 2014 12:19:06 GMT -5
Generally, aud, the Square-D products are well enough made that they lack the mechanical hum typical of many isolation transformers. You'll note that the Topaz has "feet" for mounting to a wall or floor. One could use rubber washers there if hum were an issue, but I've never heard any from my unit. In fact, I think that Square-D even publishes noise specs on their units for hum and vibration (although my brain may play me false on this statement - I might have been another product).
If you can find one at a reasonable price, I think that an isolation transformer is higher-current, more-durable, and much longer service-life product than ANY other type of power conditioner. I use the strips too, mind you, but I consider them "disposable," and generally wouldn't leave one in service more than a year or two with any confidence. I'll be able to hand down that isolation transformer to my grandkids and it'll still work like new.
|
|
|
|
Post by aud on Jul 27, 2014 16:55:36 GMT -5
That's great news Boom. With my luck I always seem to get the loud transformers. I even had to send back, under 30 day refund, a XPA-5 amplifier. It's transformer hum was audible from my listening chair. Unacceptable for me. My room is very quiet. When Emotiva received the amp back they told me they check it and considered the hum to be normal.
|
|
|
|
Post by ncred02 on Jul 27, 2014 19:03:01 GMT -5
Normal? from your listening position? thats crazy
Today I was in my HT and my wife walked out of the bathroom and shut the light. The buzzing got lower, by a lot. Im narrowing it down
|
|
|
|
Post by Priapulus on Jul 27, 2014 19:48:29 GMT -5
> my wife walked out of the bathroom and shut the light. The buzzing got lower, by a lot
Do you have dimmer switches? They are terrible noise makers, both into the power lines, and by radio. "by radio" means that poorly made interconnects can act as antennas and pick the noise up over the air.
/b
|
|
