|
|
Post by garbulky on Dec 7, 2021 9:09:40 GMT -5
Guys, minus 6DB is not that terrible. Y’all are acting like he is a party animal 🦇👻 I don't know about his gear but my XSP-1 G2 at -15dB with ERC3 and SA250 amp into a pair of AR9s is $^&#@#%^ LOUD (never went higher and normally don't go there) If the OP wants to play loud he should go with a pair of 901s. Very insensitive to power applied and LOUD.
I remember the time I turned on my UPA-2 amp with the volume at 0db accidentally. Whee!  |
|
|
|
Post by geebo on Dec 7, 2021 9:11:32 GMT -5
Hi all - I recently had TWO voice coils burn from the left & right speakers (Ascend Sierra towers). My XPA-11 is hooked up to a Marantz AV7705, and when this happened I was playing music in stereo about -8 to -6db. I've done a bit of research on this and a couple of forums as well, and a lot of the feedback that I'm getting are pointing towards the amp. Best I've settled on is that perhaps there was a transistor that failed when reaching a certain temperature under the load. I've hooked up a cheap speaker to the amp and don't hear any humming or pops when turning on/off, so if there is an issue, it's not consistent. Does anyone know if this amp has any protections against DC offset? The specs page doesn't quite say it other than saying 'common fault tolerances' ... Would also like to get the amp tested and any thoughts/feedback on that would certainly be appreciated as well. Related thread over at audioholics: forums.audioholics.com/forums/threads/ascend-sierra-tower-emotiva-xpa-11-burnt-voicecoil.123945/Cheers! Just curious, what is your amp's channel configuration with regards to single and stereo modules and what was driving the Ascends? |
|
|
|
Post by garbulky on Dec 7, 2021 9:24:09 GMT -5
Hi all - I recently had TWO voice coils burn from the left & right speakers (Ascend Sierra towers). My XPA-11 is hooked up to a Marantz AV7705, and when this happened I was playing music in stereo about -8 to -6db. I've done a bit of research on this and a couple of forums as well, and a lot of the feedback that I'm getting are pointing towards the amp. Best I've settled on is that perhaps there was a transistor that failed when reaching a certain temperature under the load. I've hooked up a cheap speaker to the amp and don't hear any humming or pops when turning on/off, so if there is an issue, it's not consistent. Does anyone know if this amp has any protections against DC offset? The specs page doesn't quite say it other than saying 'common fault tolerances' ... Would also like to get the amp tested and any thoughts/feedback on that would certainly be appreciated as well. Related thread over at audioholics: forums.audioholics.com/forums/threads/ascend-sierra-tower-emotiva-xpa-11-burnt-voicecoil.123945/Cheers! Honestly, the easiest method would be to ship it to Emotiva for inspection. |
|
|
|
Post by 405x5 on Dec 7, 2021 9:45:34 GMT -5
In ALL your answers and reading has ANY mention been made of Compression? Copper changes resistance at a known rate as it gets hot. It INCREASES. I suspect you just burned UP the driver. DC offset on a driver with a capacitor? I don't know.....sounds.....fishy. But simply too loud? Than speaker gets hot and you turn it up a little MORE? Nothing wrong with your amp. Wrong speaker for what you want to do. Get some Cerwin Vega. They'll take anything......nearly... Maybe some KLIPSCH from the Heritage line? You'll only need 100 watts per speaker to get kicked out of your town..... Yeah compression is the answer! youtu.be/yLC8Rrd5ze4 |
|
|
|
Post by leonski on Dec 7, 2021 14:43:53 GMT -5
Don't forget that music also has what's called a 'crest factor'.....I'd use 10db for a start which means that from any 'nominal' level, you can expect 10db peaks.
10db is also, as it turns out, 10X the power. I don't know you'd hear distortion which occurs that quickly.....
I'll wager 50 Pesos your amp is FINE....
|
|
|
|
Post by DavidR on Dec 7, 2021 14:56:06 GMT -5
.............................................................................................................................................................. I'll wager 50 Pesos your amp is FINE.... Most of us have said this. Perhaps we should start a poll. I might do it later. |
|
|
|
Post by housetech on Dec 7, 2021 17:04:38 GMT -5
Back in 1999-2000, I purchased a Sony STR-DA555ES receiver (just came to market) and a set of 5.1 Monitor Audio speakers. Long story short, it blew three speakers (always the rear surround woofers) within the first month, Each time the volume was not loud, around 70dbs- heard a pop, then went dead. The store replaced the speakers. The salesman I've gone to for years (Starpower, Dallas) asked me a lot of questions, then said bring in the Sony, something's wrong. He gave me a loner 777ES, called later and offered a big discount to buy it but I declined- wanted a Denon. About week later, the Sony USA VP Sales Manager called me at home to get details- very detailed questions. Apparently that model was having "issues" that was blowing speakers. I never got any more feedback but did get a Sony $50 gift card in the mail from Sony.
Point being, manufacturers know pretty quickly if a product has inherent problems.
JeeperJK,
"I recently had TWO voice coils burn from the left & right speakers (Ascend Sierra towers)."
Which drivers blew- mid? woofer? tweeter? same driver in each speaker? I'm guessing the Mids in both
Ascend Sierra towers are 4 ohm, correct? So the RMS power of the XPA is about double
I read the tweeter is SEAS ( good quality), but nothing mentioned of the Mid or Bass woofer brands. The "Proprietary" mid-woofer looks like a SEAS.
My thoughts are one 5.25” Mid-Range driver will not take high power you're pumping into it, regardless if the speaker unit are 300watt max power.
I also see this issue has been posted on multiple sites.
I'm done with this story
|
|
|
|
Post by DavidR on Dec 7, 2021 17:49:47 GMT -5
 Sierra doesn't really state the speaker impedance. It does give the minimum impedance you will see at 4 ohms. This doesn't mean it is a 4 ohm speaker. I have speakers that dip to 3.2 ohms yet they are rated 4 ohm speakers. Since the spec sheet states an amp rated at 8 ohms is adequate I would assume they are 8 ohms speakers.
 XPA-11 G3 specs (The OP has not told us which generation XPA-11 he has)
I've experienced a DC offset issue. It will not correct itself. It was a modified Carver M-1.0t with 460wpc into 8ohms. The modifier did not correctly incorporate his additional circuitry within the amp's speaker protection. A TIP transistor failed sending 70VDC to my one of my speakers. You would get a loud pop and then the amp would shutdown but would reset itself and do it again. There is also an adjustment pot for DC offset (on that amp anyway). Neither can self correct. A DC voltage into a speaker will destroy the woofers first as there is no capacitor to block the direct current. Even drivers with a capacitor can be damaged if the voltage exceeds the caps rated capability.
Since the OPs amp is working one can only come to one conclusion. Why are we still dancing around on this?
BTW, my 901_VI speaker survived the attack.
|
|
|
|
Post by leonski on Dec 9, 2021 0:41:05 GMT -5
I see a couple things on the 'spec sheet'.
Anachoic AND in room sensitivity are a reaonable 3db apart. so far, so good.
Impedance not specified, as you note....but the listed sensitivities are probably lower based on lower impedance. 2.83v is 1 watt at 8 ohms.......Voltage for 1 watt drops as impedance does.....
I get it about thinking they are 8 ohm.....but the manufacturer is not forthcoming.
And finally? Max power should ALWAYS be specified as 'unclipped'.....I see max and long term 'astricked' which is also not defined....maybe elsewhere?
EMO specifies 2600 watts MAX POWER INPUT which is under special consitions AND handily exceeds a single 20 amp circuit used ONLY for the amp......
OP doesnt' say if OTHER speakers are being driven at the time of the malfunction. If SO? Power available is lower and potentially a LOT lower than specs for 2 channel.....so the amp is potenially clipping
at powers below the (sort of depends) the maximum listed in the speaker spec sheet.......
|
|
|
|
Post by DavidR on Dec 9, 2021 8:38:19 GMT -5
Again, why are we still dancing around this ?
|
|
|
|
Post by audiosyndrome on Dec 9, 2021 9:25:08 GMT -5
Tooooo loud. Enough already. 😜
Russ
|
|
|
|
Post by 405x5 on Dec 9, 2021 10:12:08 GMT -5
Tooooo loud. Enough already. 😜 Russ The OP did acknowledge (in his own way) on a previous post…. |
|
