dustin
Seeker Of Truth
Posts: 4
|
Post by dustin on Mar 14, 2011 22:44:56 GMT -5
Okay: Here's my issue.....I have a buzz coming out of my efficient JTR 4 ohm speakers. The buzz came up after I introduced the Emotiva XPA-5 amp. I'm only hearing the buzz from the front three speakers and not the sides, which are JBL 8 ohm speakers. Rob, I just had the same problem (didn't see that you had it fixed, it's now March, but oh well). I was running 5 mono blocks with no problems. Put the XPA-5 in and had major noise issues. I read this article: www.audioholics.com/tweaks/connecting-your-system/ground-loops-eliminating-system-hum-and-buzz and unplugged the coax cable from the wall...poof, hum was gone. I plugged the cable into my surge protector and it's still gone. Hope it's that easy for you.
|
|
|
Post by matt on Mar 24, 2011 20:23:43 GMT -5
I had a cable modem in one room and a bunch of networking equipment in another. The networking equipment was on a UPS, so if the power went out, I would still have uninterrupted network access for a while. To keep my internet access running, I put my cable modem on a power over Ethernet adapter. When I plugged the adapter in, smoke came out of the cable modem. I unplugged everything and started to measure the current difference between connections. I found that the power over Ethernet adapter connected the DC negative to the AC ground. The cable modem grounds the cable shielding to the DC negative. So, I measured the difference between the cable shielding and the AC ground. The voltmeter read 63 volts. My workaround was to use a three prong to two prong AC adapter on the power over Ethernet adapter. Granted, that is a bad thing to do in most cases, but I could not justify why the DC negative needed to be grounded unless it was used for an outdoor wireless access point. The original cable modem's AC adapter did not ground the DC negative, so it would make sense that the power over Ethernet adapter should also not do that. A Cable TV Ground Isolator would have been a better solution in most cases, assuming no significant signal loss.
|
|
|
Post by ausman on Mar 25, 2011 0:00:02 GMT -5
also note before using eop devices make sure all ppwer points are certified to use them..
biggest issue with new tech toys people think everything is plug and play when they find out it isn't watch for cooking equipment..
|
|
dettol
Seeker Of Truth
Posts: 1
|
Post by dettol on Jul 20, 2011 12:24:28 GMT -5
Hi there, some input on my new emotiva XPA-5 amp. After connecting the amp to my system (Onkyo 1007), i had observe there is a distinct soft hissing sound coming from my speakers (Kef Q15 speakers, mirage surround and definitive 2300) For further troubleshooting i then disconnected all inputs to the emotiva leaving only the connections to the speakers. After power up, i can still hear the continous hissing noise. It's not loud but you will hear it when you are standing close to them (around 1 meter away). This hissing noise exist for all outputs but varies in loudness. I know this is from the emotiva amp and not due to the speakers as i had switch my 3 different brand of speakers around and were even able to identify the center output post having the highest hissing noise. Not only that, it is always there even if you connect a preamp and play whatever source through it. This is normal for the amp? My mid end onkyo TX-NR1007 9.2 channel do not have any hissing sounds... only my 20 over years old kenwood midi hifi hiss like that...
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jul 20, 2011 13:20:49 GMT -5
I used to have a problem with my amps going into protected mode every time my cables were touched. I narrowed it down to the interconnects between the amps and miniDSPs. After the cables were replaced the problem was gone..
|
|
|
Post by xtreme02gt on Jul 20, 2011 22:07:03 GMT -5
I have a question, I have had my XPA-3 for 2 years now, nothing has been moved or touched but for the last few days I have had a issue with my amp, after about 3 to 4 hours of it on at low volume, it will shut off. The amp is not even warm, nothing is touching anything and we keep our room at 65. So I need a little help to figure out why it keeps going into protection mode.
Please HELP!!
|
|
|
Post by fc911c on Dec 3, 2011 14:10:23 GMT -5
Hi there, some input on my new emotiva XPA-5 amp. After connecting the amp to my system (Onkyo 1007), i had observe there is a distinct soft hissing sound coming from my speakers (Kef Q15 speakers, mirage surround and definitive 2300) For further troubleshooting i then disconnected all inputs to the emotiva leaving only the connections to the speakers. After power up, i can still hear the continous hissing noise. It's not loud but you will hear it when you are standing close to them (around 1 meter away). This hissing noise exist for all outputs but varies in loudness. I know this is from the emotiva amp and not due to the speakers as i had switch my 3 different brand of speakers around and were even able to identify the center output post having the highest hissing noise. Not only that, it is always there even if you connect a preamp and play whatever source through it. This is normal for the amp? My mid end onkyo TX-NR1007 9.2 channel do not have any hissing sounds... only my 20 over years old kenwood midi hifi hiss like that... Hi did you ever find out what the prolem was, I just got the same amp and I am having the same problem, also there is a slight hum. It happens all the time even with just the speakers connected. Thanks Frank
|
|
|
Post by dbster on Dec 12, 2011 20:11:12 GMT -5
Someone mentioned they had only one blue light no matter what they were playing. I think there are two switches on the back of the amp. One controls the lone LED on each channel that says it is on; the other controls the remainder of the LEDs in the row that are the output meter.
|
|
|
Post by dbster on Dec 12, 2011 20:16:26 GMT -5
Someone mentioned stacking the amps. Others have mentioned putting them in cabinets. IMHO, a convection cooled internal heat sink arrangement should have NOTHING above it for at least six inches. And even then, not in an enclosed space. I have an XPA-2 on an open table and have my USP-1 four inches to the left, standing in its end.
|
|
|
Post by NezFF on Dec 18, 2011 22:24:31 GMT -5
|
|
|
Post by NezFF on Dec 18, 2011 22:25:37 GMT -5
I just hope that what the guy is claiming happened is not true. Emo not paying for return shipping on something that was their fault.
Granted I have always had good luck with emo.
|
|
|
Post by a1uc on Dec 18, 2011 22:49:53 GMT -5
I just hope that what the guy is claiming happened is not true. Emo not paying for return shipping on something that was their fault. Granted I have always had good luck with emo. I had a problem once with a lady that answered the phone , she was outright rude , but this was a first the other 2 times they treated me very well and sent me new items to replace the defective ones along with a call tag
|
|
|
Post by NezFF on Dec 18, 2011 22:53:25 GMT -5
Rachel took care of me with my amp. I got a brand new amp shipped with a call tag.
|
|
|
Post by NezFF on Dec 19, 2011 12:54:04 GMT -5
|
|
|
Post by robc1976 on Dec 19, 2011 13:00:31 GMT -5
I also thank you to, they came thru....I am very impressed...honestly am!
|
|
|
Post by Jean Genie on Jan 1, 2012 13:34:39 GMT -5
Someone mentioned they had only one blue light no matter what they were playing. I think there are two switches on the back of the amp. One controls the lone LED on each channel that says it is on; the other controls the remainder of the LEDs in the row that are the output meter. I have this issue with My new XPA2. The status LEDs light but no meter LEDs. I've swithed both on and off (together and seperately) and also powered the amp on and off and changed sources but still no meter LEDs. Any suggestions. Thanks in advance, George Uh, I just figured it out..........Oh my! ;D ;D ;D
|
|
ftmb
Seeker Of Truth
Posts: 2
|
Post by ftmb on Jan 24, 2012 11:14:26 GMT -5
Dear, I own an XPA-5 purchased in the middle of last year. I'm having a little problem with it and would like to know if you have the solution? Since when I installed it goes into protection mode between the first 10 to 30 minutes of use. At first it appeared in red light the channel 5 (front right) and now in recent times this appearing on channels 1 and 5 (pair of fronts). I have already checked several times to see if the installation was not a short wire, etc., but that's OK. Whenever it enters the protection I turn on again and then it works normal and does not turn off anymore. Even I have used for hours and hours in very high volume it never shut off after that first shut off (protect mode). I noticed that whenever it turns off (protected mode) when the volume is very low and still cold. When it get warm don't shut off more! My front speakers is the Paradigm Studio 40 v3. (compatible until 8 ohms).
The only thing I would suspect is about the impedance on my installation, which is as follows: Channel 1 - Front Left (Paradigm Studio 40 v3-compatible up to 8ohms) Channel 2 - surround left (pair of polk audio RCi-85 - connected in parallel - each has 8 ohms> falls in parallel w / 4 ohms) Channel 3 - central (Paradigm CC470 v3 - supports up to 8 ohms). Channel 4 - surround right (pair of polk audio RCi-85 - connected in parallel - each has 8 ohms> falls in parallel w / 4 ohms) Channel 5 - Front right (Paradigm Studio 40 v3-compatible up to 8ohms)
I use the Emotiva XLR interconections cables (new).
Does this parallel connection of the surround and the impedance mismatch between the channels is making it go into protection?
Another thing that happened this past weekend, my 2 front speakers burned the tweets. It happened after several hours of use with the volume up high (in stereo). When opening the twitter I saw that were partially melted with the coil. Can it have something to do with the XPA5 problem or do I really overdid the volume and time and the speakers did not hold?
Thanks if you can help me!
|
|
|
Post by House on Jan 24, 2012 11:25:30 GMT -5
I would bet that channels 2 and 4 are dipping way below the limits of resistance....they may on paper be 4 ohms after paralleled but when actually played and extended down to lower frequencies and power needs you are likely dipping well below the limits of the amp.....
one way to test this would be to disconnect one of the polk rci-5's from each channel so its at the 8 ohm load and then try again......
i realize these are rears so they shouldnt dip too low but you never know till you try....
|
|
ftmb
Seeker Of Truth
Posts: 2
|
Post by ftmb on Jan 25, 2012 18:09:42 GMT -5
I would bet that channels 2 and 4 are dipping way below the limits of resistance....they may on paper be 4 ohms after paralleled but when actually played and extended down to lower frequencies and power needs you are likely dipping well below the limits of the amp..... one way to test this would be to disconnect one of the polk rci-5's from each channel so its at the 8 ohm load and then try again...... i realize these are rears so they shouldnt dip too low but you never know till you try.... I agree that channels 2 and 4 can being dipping way below the limits, but why only that channels 1 and 5 are going to protected mode? By the way I will test disconnect two of RCI85, at this weekend. After I will post the result here. Thanks
|
|
agv
Minor Hero
Posts: 18
|
Post by agv on Apr 15, 2013 14:44:26 GMT -5
Hello. Recently I got UMC-200 and XPR5. The rest of all components including speakers go by sea and have to come to me in 2 weeks. I decided meanwhile them to connect and to test. After connection of the Trigger (to the amplifier except a power cable, nothing else connected) sometimes when turned on, starts blinking red LED above the Standby button and LED Bargraph Meter (each time differently, but generally it is 4,5 and 3rd channel). Only after switching off the AC Power and switching-on it is possible to use the amplifier again. I noticed that if it in the switched-on and working condition that errors don't appear, i.e. errors sometimes appear when you switch on amplifier (via Trigger). Probably these errors sometimes appear because speakers and also an audio signal aren't connected to the switched-on amplifier? Please advise. Thank you.
|
|