HT is installed, now it needs tweaking - AVS Forum
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post #1 of 24 Old 02-23-2012, 07:53 PM - Thread Starter
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I have an 1121, Pl-89's Pl-28, surrounds, xls1500, and a MA2050. The Acoustechs look and sound great, but I can't say that I can tell a difference in sound from the tsi 300's. Although I haven't tried the acoustechs connected to the reciever, I do believe the amps make a big difference. I have no problem with movies, music now thats another issue. While playing music in 2-channel at reference levels, I noticed the clipping led flashed a couple of times. I was under the assumption that at 300rms the amp wouldn't come close to clipping. I originally had the pl-89's on the crown, then I tried them on the marathon and the samething would happen listening to 2-channel music at reference levels. Of course I turned the gain down on the amps, but the sound levels drop. Since my ears aren't bleeding, I want more. I was hoping with a little help from you guys I would be able to tweak my system and get ear bleeding results. Let me know what info I need to provide.
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post #2 of 24 Old 02-24-2012, 12:15 PM - Thread Starter
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Anyone?
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post #3 of 24 Old 02-24-2012, 12:21 PM
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^^^

how far away from the speakers are you? assuming a normal home environment, there's no way you shouldn't be able to make your ears bleed...

heck, the avr (even though you are "sure" about something you haven't tried ) would be enough to drive those to ear bleeding levels....

something isn't right here...

- chris

 

my build thread - updated 8-20-12 - new seating installed and projector isolation solution

 

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post #4 of 24 Old 02-24-2012, 12:36 PM - Thread Starter
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Quote:
Originally Posted by ccotenj View Post

^^^

something isn't right here...

That's what I was thinking. I sit about 11ft away from my fronts.
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post #5 of 24 Old 02-24-2012, 12:46 PM
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then yea, something definitely isn't right...

hmmm...

- chris

 

my build thread - updated 8-20-12 - new seating installed and projector isolation solution

 

http://www.avsforum.com/t/1332917/ccotenj-finally-gets-a-projector

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post #6 of 24 Old 02-24-2012, 01:20 PM - Thread Starter
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Is there a meter of some sort that I can use to measure SPL?
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post #7 of 24 Old 02-24-2012, 01:21 PM
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Do you have an iPhone or Droid..
Excellent apps available for < $5..

Just my $0.02...
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post #8 of 24 Old 02-24-2012, 01:28 PM - Thread Starter
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I have an iPhone. Which app do you recommend?
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post #9 of 24 Old 02-24-2012, 02:34 PM
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there is a freebie called "jl audio tools" that i downloaded...

not the most accurate in the world, but it'll at least get you in the neighborhood...

- chris

 

my build thread - updated 8-20-12 - new seating installed and projector isolation solution

 

http://www.avsforum.com/t/1332917/ccotenj-finally-gets-a-projector

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post #10 of 24 Old 02-24-2012, 03:08 PM
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Quote:
Originally Posted by johnson636 View Post

I have an iPhone. Which app do you recommend?

The one I like is called VU Meter by Cateater....
Has an analog meter scale but various settings for sensitivity..

Just my $0.02...
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post #11 of 24 Old 02-24-2012, 03:32 PM - Thread Starter
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According to the JL spl meter I got to up to 105db from 12ft away, but the red clipping led's would start to flash at those listening levels. I thought neither of the two amps I have would clip with these speakers.
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post #12 of 24 Old 02-24-2012, 03:47 PM - Thread Starter
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Hit up to 106db before the clipping led's start flashing according to VU meter. I'm concerned about the amp clipping at the sound levels that I like. I don't know just how accurate these reading are, but I tend to like my max louder than 106db; if those are accurrate readings.
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post #13 of 24 Old 02-24-2012, 05:27 PM - Thread Starter
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I measured the voltage (AC) at one of my tower terminals and it fluctuated no higher than 13vac divided that by 8 then mutiplied the I times 13 and thats a grand total of 21.125w. Something is not right; just don't know what
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post #14 of 24 Old 02-25-2012, 04:06 PM - Thread Starter
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Quote:
Originally Posted by johnson636 View Post

I measured the voltage (AC) at one of my tower terminals and it fluctuated no higher than 13vac divided that by 8 then mutiplied the I times 13 and thats a grand total of 21.125w. Something is not right; just don't know what

Does this sound right? I was gonna get an amp for a different setup, Maybe I could use either the MA2050 of xls1500 to go with the other setup and just get a EP4000 to power my pl-89's. Or will this happen regardless of what amp I'm using. Could it be the speakers causing the these amps to act in this way?
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post #15 of 24 Old 02-26-2012, 10:14 AM - Thread Starter
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Guys, if I can get you to point me in the right direction that would be great. I've searched the forum and googled for some insight on this matter. The clipping LEDs never flash during movies this is only during music. I want to make sure that a I don't overlook a problem that would be present no matter what amp I get? Please, I looking for a little help.?
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post #16 of 24 Old 02-26-2012, 06:09 PM
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I would guess there's a definite difference in trying to hit reference level with movies and music. Music is more continuous.

I would think you are trying to hit what could be ear damaging levels from what you have said, which I don't suggest.

I can play music quite loudly and never clip with my XLS 1000. If you can play music at 95 dB (average), that seems more than loud enough...can you hit that level?

You mentioned measuring AC...I am not sure that works. Multitesters may not be suitable for measuring audio signals, even if they have RMS voltage.

"But this one goes up to 11"
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post #17 of 24 Old 02-26-2012, 07:13 PM - Thread Starter
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Quote:
Originally Posted by MichaelJHuman View Post

I can play music quite loudly and never clip with my XLS 1000. If you can play music at 95 dB (average), that seems more than loud enough...can you hit that level?

According to two apps on my iphone I can. I hit 106db on VU meter and JL audio tool, but I don't know how accurate these measurements are. How are you determining you spl?
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post #18 of 24 Old 02-27-2012, 11:43 AM
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I have an SPL meter from Rat Shack. I have not measured my SPL when playing music at high than background levels recently. But when I was younger, 95 dB barely seemed loud enough (that does not mean I suggest over 95 dB...hearing is precious and irreplacable...I have of course learned wisdom with age

"But this one goes up to 11"
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post #19 of 24 Old 02-27-2012, 12:11 PM - Thread Starter
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Do you believe low source voltage may be an issue. How can I tell what my source voltage is? Will I benefit from an EP4000?
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post #20 of 24 Old 02-28-2012, 07:41 PM - Thread Starter
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Quote:
Originally Posted by MichaelJHuman View Post

I would guess there's a definite difference in trying to hit reference level with movies and music. Music is more continuous.

I would think you are trying to hit what could be ear damaging levels from what you have said, which I don't suggest.

I can play music quite loudly and never clip with my XLS 1000. If you can play music at 95 dB (average), that seems more than loud enough...can you hit that level?

You mentioned measuring AC...I am not sure that works. Multitesters may not be suitable for measuring audio signals, even if they have RMS voltage.

What are you driving with you xls1000? I've heard pf people using an xls 1000 ,1500 for driving subs (without mentioning clipping) which is way more demanding on an amp than mains set to small and crossed over at 80hz. Am I missing something?
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post #21 of 24 Old 02-29-2012, 10:30 PM - Thread Starter
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I am determined to get to the bottom of this clipping issue. I checked the impedance of my pl 89's and my pl 28 and all three are reading 3ohms instead of the rated 8ohms The ma 2050 and xls1500 claim 500wpc(probably more like 400) @ 4ohms but the acoustechs have a rms of 250w. Can this be the cause of the amp red clipping LED flashing?
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post #22 of 24 Old 02-29-2012, 11:34 PM
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Quote:
Originally Posted by johnson636 View Post

What are you driving with you xls1000? I've heard pf people using an xls 1000 ,1500 for driving subs (without mentioning clipping) which is way more demanding on an amp than mains set to small and crossed over at 80hz. Am I missing something?

I have a pair of B&W 600 series bookshelf speakers hooked up to the XLS 1000. They are setup for rear surround sound. They are not too far from my usual sitting area, so don't need a ton of power.

I did (temporarily) hook up the XLS 1000 to my B&W tower speakers. I had no problems driving them to higher than needed SPL.

"But this one goes up to 11"
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post #23 of 24 Old 03-01-2012, 05:30 AM - Thread Starter
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Did your clipping LED ever flash? So the fact of my speakers ohming out @ 3 ohms should' be a concern?
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post #24 of 24 Old 03-01-2012, 05:20 PM - Thread Starter
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Ok, for those who are interested, what I found was I had the gain turned too high; I was thinking they were volume knobs and was absolutely wrong. I had the gain controls on both channels set to -6, I adjusted them to -12 and the clipping went away. The only thing that changed was how much volume I'd give from the 1121 before it got really loud. before, It would get to a certain output level and then clip now I can get to that same output level and it never clips. Now on to another question I have, I noticed that the signal LED would only react to sounds like a really sharp snaredrum beat played from the tweeter, but would not react to lower frequency sounds played from the 8" drivers. Anyone care to share why this is?
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