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Post by krauley on May 8, 2019 19:11:49 GMT -5
So real quick. I have a XMC-1 with a XPA-2 gen 3 to drive my L/R and a XPA-5 to drive my C/SL/SR/SBL/SBR. All my speakers are 8 ohm. What i want is to upgrade the L/C/R/SL/SR but the speakers im looking at are 4 ohm which would mean i have two 8 ohm and three 4ohm speakers being driven by the XPA-5. Will this work? Looking at upgrading my polk audio monitor 70 and 50 speakers to Airmotiv T2 and T1. And the center from a PA cs20 (or cs2) to the C2.
Opinions on this working?
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Post by creimes on May 8, 2019 19:21:42 GMT -5
It will be fine, I think you will be very happy with the change.
Chad
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Post by amped on May 8, 2019 19:22:26 GMT -5
Sorry I will re state: You may, and are likely to, encounter thermal issues running all channels (full range) at 4 ohms for an extended period of time like during a 2 plus hour high energy movie (EDIT)that wont work with that amp...Curious what speakers are you looking at that are 4 ohm? And why?
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Post by krauley on May 8, 2019 19:26:32 GMT -5
It will be fine, I think you will be very happy with the change. Chad As long as the diiferent speakers get along with the amps im doing it  |
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Post by krauley on May 8, 2019 19:29:07 GMT -5
Sorry but that wont work with that amp...Curious what small speakers are you looking at that are 4 ohm? And why? Ok the small speaker are 8 ohm and are mounted on the back wall so they stay. they are polk audio monitor 30 speakers. The speakers im looking into are the airmotiv T2, T1 and C2 which are the 4 ohm speakers |
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Post by vcautokid on May 8, 2019 19:45:56 GMT -5
Absolutely that will work perfectly. The XPA amplifier family especially does well with lower impedance or higher ones. It has the current to do very well. The T and C series will function perfectly and not pose any worry at all. The XPAs have proven their worth in my home with driving difficult Planars even more demanding than the T or C series speakers with no problems. Unlike today's audio video receivers that are basically castrated amplifiers of their former selves, the brawny XPA amplifiers from the ground up were designed with difficult to drive loads from the very beginning. So use any speaker and enjoy the ride, the XPA will impress you with its reserves and current swing.
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Post by amped on May 8, 2019 21:04:54 GMT -5
That amp will go thermal driving 5 channels at high levels at 4 ohms...Lets see what KL thinks. I had my XPA 2 shut down driving my efficient 8 Ohm speakers after an hour of listening to Basia... YMMV
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Post by donh50 on May 8, 2019 21:41:21 GMT -5
My XPA-5 did fine driving low-sensitivity 4-ohm Magnepans all the way around. It may depend upon how loudly you listen and the airflow around the amp. Mine is actually in a cabinet thus airflow is not all that great, but I have nothing immediately above it and opened the back to provide as much as I could. You could also add fan blade to help keep it cool if needed.
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Post by vcautokid on May 9, 2019 2:24:12 GMT -5
That amp will go thermal driving 5 channels at high levels at 4 ohms...Lets see what KL thinks. I had my XPA 2 shut down driving my efficient 8 Ohm speakers after an hour of listening to Basia... YMMV You don't need to wait for Keith. At louder levels and a speaker impedance drop below 2 ohms as impedance is a function of frequency a speaker may dip very low causing possibly the XPA to go into protection. It is never the nominal impedance but the Depp dips that require more current. |
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Post by amped on May 9, 2019 7:34:56 GMT -5
Sorry but that wont work with that amp...Curious what small speakers are you looking at that are 4 ohm? And why? Ok the small speaker are 8 ohm and are mounted on the back wall so they stay. they are polk audio monitor 30 speakers. The speakers im looking into are the airmotiv T2, T1 and C2 which are the 4 ohm speakers I would say that if EMO speakers are what you are looking at you should have no problems as I am sure they are designed to play well with other EMO equipment. That being said I still would make sure you have PLENTY of air flow around your amp AND dare I say the proper Gauge speaker wire. |
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Post by creimes on May 9, 2019 8:09:53 GMT -5
That amp will go thermal driving 5 channels at high levels at 4 ohms...Lets see what KL thinks. I had my XPA 2 shut down driving my efficient 8 Ohm speakers after an hour of listening to Basia... YMMV That is interesting as I have 3 T1 across my fronts and my two rears are also 4 0hm speakers being Emotiva's UAC 8.2 ceiling speakers, all five speakers running off my measly BasX A-500 and I had it pumpin the other night with both concert blu-ray and blu-ray movies and had no issues. Chad |
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Post by selind40 on May 9, 2019 8:19:42 GMT -5
That amp will go thermal driving 5 channels at high levels at 4 ohms...Lets see what KL thinks. I had my XPA 2 shut down driving my efficient 8 Ohm speakers after an hour of listening to Basia... YMMV That is interesting as I have 3 T1 across my fronts and my two rears are also 4 0hm speakers being Emotiva's UAC 8.2 ceiling speakers, all five speakers running off my measly BasX A-500 and I had it pumpin the other night with both concert blu-ray and blu-ray movies and had no issues. Chad But you're in Canada...pumpin up there is different because sound waves move more freely ( I have no idea what I'm speaking of btw).  |
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Post by davidl81 on May 9, 2019 8:31:55 GMT -5
I had my XPA-5 (Gen 2) running my Mirage OMD-28 and C2 speakers (6 ohm) and the RS (OMD-5) with no issues at all with heat. Multiple hours at high volumes. Now would 4 ohm be worse? IDK maybe, but there are a lot of people on this board with T1-T2 speakers on Emotiva gear and I have not heard any with issues on the amps going into protection mode. And one thing I know to be true about any forum, if there is a problem you WILL hear a ton about it.
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Post by creimes on May 9, 2019 8:59:59 GMT -5
That is interesting as I have 3 T1 across my fronts and my two rears are also 4 0hm speakers being Emotiva's UAC 8.2 ceiling speakers, all five speakers running off my measly BasX A-500 and I had it pumpin the other night with both concert blu-ray and blu-ray movies and had no issues. Chad But you're in Canada...pumpin up there is different because sound waves move more freely ( I have no idea what I'm speaking of btw). What kind of "pumpin" are we talking about here  |
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Post by amped on May 9, 2019 9:12:53 GMT -5
That amp will go thermal driving 5 channels at high levels at 4 ohms...Lets see what KL thinks. I had my XPA 2 shut down driving my efficient 8 Ohm speakers after an hour of listening to Basia... YMMV That is interesting as I have 3 T1 across my fronts and my two rears are also 4 0hm speakers being Emotiva's UAC 8.2 ceiling speakers, all five speakers running off my measly BasX A-500 and I had it pumpin the other night with both concert blu-ray and blu-ray movies and had no issues. Chad I really enjoy the vailed sarcasm...I revised my 2 cent opinion later in the thread may want to read the whole thread...However, I also find it interesting that in my experience(s) my XPA overheated and shut down on multiple occasions as I stated so that remains a fact that's why I bought another one and used them as monoblocks. And your "pumpin" and my "pumpin" may be two entirely different "pumpins". |
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KeithL
Administrator 
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Post by KeithL on May 9, 2019 9:58:30 GMT -5
Here's what I would say.... None of our amps should overheat or otherwise go into protect because of driving 4 Ohm speakers at reasonable levels for any amount of time. And that certainly applies to our speakers - all of which are relatively well behaved - and don't have an impedance that dips unusually low at certain frequencies.
(But, yes, they will run noticeably warmer into 4 Ohm speakers, and even warmer into speakers that have an impedance that dips significantly below that.)
However, if one of our amps is actually overheating, then I would suspect that either:
1) There's something wrong with the amp 2) There's something wrong with the speakers or the speaker wires 3) The speakers are really inefficient and/or you have an odd idea about "reasonable levels" 4) (AND THE MOST LIKELY) The amplifier doesn't have sufficient ventilation
Our amplifiers use convection cooling... which is a fancy way of saying that hot air rises out the top which, in turn, pulls more cool air in at the bottom. This process is relatively weak (there are no fans sucking or blowing the air through the amplifier - so the air isn't pushing very hard). This means that you really need an unobstructed air flow to allow the air to gently flow through the amp. (And, if you have unobstructed air flow, our amps generally run relatively cool.)
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Post by creimes on May 9, 2019 12:18:46 GMT -5
That is interesting as I have 3 T1 across my fronts and my two rears are also 4 0hm speakers being Emotiva's UAC 8.2 ceiling speakers, all five speakers running off my measly BasX A-500 and I had it pumpin the other night with both concert blu-ray and blu-ray movies and had no issues. Chad I really enjoy the vailed sarcasm...I revised my 2 cent opinion later in the thread may want to read the whole thread...However, I also find it interesting that in my experience(s) my XPA overheated and shut down on multiple occasions as I stated so that remains a fact that's why I bought another one and used them as monoblocks. And your "pumpin" and my "pumpin" may be two entirely different "pumpins". Your reading into my response to hard haha, no sarcasm just my experience, I'm an easy going cool cat  Chad |
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Post by rbk123 on May 9, 2019 13:06:00 GMT -5
> I'm an easy going cool cat Or is he?.....  |
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Post by krauley on May 9, 2019 14:12:16 GMT -5
Lots of good, fun and varying opinions so far. Thanks for each one. My xpa's have never gotten warm, yes thats right no problems ever. Except of course when ive moved the xpa-5 a couple of times  My xmc and both xpas sit in a SANUS Euro Series av rack which is open and mine has 13.5 inches shelf to shelf for the amps so there is plenty of room to breathe for the amps.  Looks like i will be good to go. thanks didnt want the pic to be so big sorry |
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Post by amped on May 9, 2019 16:00:02 GMT -5
I really enjoy the vailed sarcasm...I revised my 2 cent opinion later in the thread may want to read the whole thread...However, I also find it interesting that in my experience(s) my XPA overheated and shut down on multiple occasions as I stated so that remains a fact that's why I bought another one and used them as monoblocks. And your "pumpin" and my "pumpin" may be two entirely different "pumpins". Your reading into my response to hard haha, no sarcasm just my experience, I'm an easy going cool cat Chad Ok Chad I'm game with that response! After a couple attacks yesterday I was a little gun shy so were all good! Now lets talk about your use of the word "pumpin"...  |
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My xmc and both xpas sit in a SANUS Euro Series av rack which is open and mine has 13.5 inches shelf to shelf for the amps so there is plenty of room to breathe for the amps. 
