baspro
Seeker Of Truth
Posts: 6
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Post by baspro on Dec 24, 2012 13:58:34 GMT -5
Can anyone tell me the values the LED's light up at as the power output goes up? I'd be happy with VU db value, voltage value or power into 8 ohms. There are no markings but they appear to function as a power or VU meter.
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Post by geebo on Dec 24, 2012 14:21:44 GMT -5
Can anyone tell me the values the LED's light up at as the power output goes up? I'd be happy with VU db value, voltage value or power into 8 ohms. There are no markings but they appear to function as a power or VU meter. Would like to know that myself if you get an answer. |
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Post by AudioHTIT on Dec 24, 2012 14:31:06 GMT -5
I've always been surprised Emotiva doesn't publish this for any of the X or R amps, it's like they're just cosmetic or for entertainment.
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Post by wynshad12 on Dec 24, 2012 15:59:10 GMT -5
I've always been surprised Emotiva doesn't publish this for any of the X or R amps, it's like they're just cosmetic or for entertainment. my thoughts exactly, as I have two XPA-2 and the led's only lights up and stays fully axpanded left and right, I disabled them from the back pannel, now I don't even remember that their there  |
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Post by kanderson2009 on Dec 25, 2012 10:17:50 GMT -5
Got mine a few days ago. I assume that the top LED equals 11 |
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Post by audiofile on Dec 25, 2012 11:14:40 GMT -5
I think my XPA-1 LED's measure out as:
1. No LED - Background music
2. 1 LED - Musically engaged
3. 2 LEDs - Sonically enveloped
4. 3 LEDs - Picture rattling excess
5. 4 LEDs - Wall flexing intensity
6. 5 LEDs - Wife screaming futility
7. 6 LEDs - Neighborly threats abound
8. 7 LEDs - Dogs howling in angry stereo
9. 8 LEDs - Windows shattering
10. 9 LEDs - Ears bleeding
11. 10 LEDs - Sonic death punch
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Post by AudioHTIT on Dec 25, 2012 16:16:46 GMT -5
I think my XPA-1 LED's measure out as: 1. No LED - Background music 2. 1 LED - Musically engaged 3. 2 LEDs - Sonically enveloped 4. 3 LEDs - Picture rattling excess 5. 4 LEDs - Wall flexing intensity 6. 5 LEDs - Wife screaming futility 7. 6 LEDs - Neighborly threats abound 8. 7 LEDs - Dogs howling in angry stereo 9. 8 LEDs - Windows shattering 10. 9 LEDs - Ears bleeding 11. 10 LEDs - Sonic death punch Finally! Some good technical documentation, did you find this at Wikipedia? Now if we can just get Emotiva to include this in the manual.  |
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Post by audiofile on Dec 25, 2012 22:43:09 GMT -5
LOL....naw, I just sat here and thought it through, drawing upon my prior experiences.  |
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Post by Porscheguy on Dec 26, 2012 10:42:17 GMT -5
They are like xmas tree lights, pretty to look at..... However, if the red ones are on (a lot) turn it down!!
Thats about it other than to tell you that the volume is real loud.... but that's kinda obvious... :-)
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Post by tchaik on Dec 26, 2012 22:25:18 GMT -5
I think my XPA-1 LED's measure out as: 1. No LED - Background music 2. 1 LED - Musically engaged 3. 2 LEDs - Sonically enveloped 4. 3 LEDs - Picture rattling excess 5. 4 LEDs - Wall flexing intensity 6. 5 LEDs - Wife screaming futility 7. 6 LEDs - Neighborly threats abound 8. 7 LEDs - Dogs howling in angry stereo 9. 8 LEDs - Windows shattering 10. 9 LEDs - Ears bleeding 11. 10 LEDs - Sonic death punch and an XSP-1 in a pear tree................. ;D ;D ;D ;D tchaik................ |
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baspro
Seeker Of Truth
Posts: 6
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Post by baspro on Dec 27, 2012 18:07:46 GMT -5
So I'm going to have to do this the hard way - get a dummy load and a signal generator and measure the voltage each LED turns on at. What a PITA, especially since the circuit designer\engineer knows this already..........
What's the point in keeping this secret?
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Post by audiofile on Dec 27, 2012 18:41:46 GMT -5
Don't know that anyone is intentionally keeping it a secret. I suspect it hasn't been asked before is all. Have you contacted Emotiva?
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Post by geebo on Dec 27, 2012 21:01:13 GMT -5
So I'm going to have to do this the hard way - get a dummy load and a signal generator and measure the voltage each LED turns on at. What a PITA, especially since the circuit designer\engineer knows this already.......... What's the point in keeping this secret? I'd be interested in your findings. |
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baspro
Seeker Of Truth
Posts: 6
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Post by baspro on Dec 27, 2012 21:03:02 GMT -5
Don't know that anyone is intentionally keeping it a secret. I suspect it hasn't been asked before is all. Have you contacted Emotiva? Yes, several months ago. No reply. This has been the only negative in the whole experience. The XPA-2, an XPA-5, a Mini-X, and 3 USP-1's - had a 12 volt trigger issue with the first one, an intermittant IR lockup with the second one and the third has been flawless. Emotiva did right by me through the whole USP-1 episode. |
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stiehl11
Emo VIPs 
Give me available light!
Posts: 7,269
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Post by stiehl11 on Dec 28, 2012 0:03:17 GMT -5
I've been told that the lights are logarithmic. When I tried to find what the base was I found a dead end. So, I assume that the 1st light equals 1 watt, then the second light would equal 2, then 4, then 8, etc. The 10th light would be 512 watts. But, that's my assumption.
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Post by AudioHTIT on Dec 28, 2012 1:36:25 GMT -5
I've posted about this several times, other amps use the top or second light as 0 dB or full power, then lights below that are negative dB below full power, depending on how many lights there are. Here's an as example I've posted before. Attachments:
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baspro
Seeker Of Truth
Posts: 6
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Post by baspro on Dec 31, 2012 11:56:46 GMT -5
Yes, they are probably logarithmic and the first LED is probably -20 db like most VU style meters. But what is the definition of -20 db? Is it 2.83 volts (1 watt into 8 ohms)? Or did they set the value of 0 db = 44.73 volts (250 watts into 8 ohms, full rated output)? And what is the definition of the leds above 0 db?
Inquiring minds want to know!!!!
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baspro
Seeker Of Truth
Posts: 6
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Post by baspro on Jan 4, 2013 20:14:05 GMT -5
So this is going nowhere..................
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Post by geebo on Jan 4, 2013 20:32:50 GMT -5
So I'm going to have to do this the hard way - get a dummy load and a signal generator and measure the voltage each LED turns on at. What a PITA, especially since the circuit designer\engineer knows this already.......... What's the point in keeping this secret? So this is going nowhere.................. Are you still planning on making the measurements yourself? |
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baspro
Seeker Of Truth
Posts: 6
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Post by baspro on Jan 6, 2013 20:48:58 GMT -5
Someday. My GF and I just split so am buying a house and moving soon. And I don't have a dummy load that will take 250 watts, I'll get one at some point for this project and because I'm curious if the XPA-2 is a 250 watt\8 ohms amp or a 300 watt\8 ohms amp. I've seen both ratings in the various ad copy. The tested power output at 8 ohms appears to be 267 and 264 watts per channel, 0.1% distortion, I assume both channels driven since there is data for both channels.
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