An amp to power a JBL SRX728 sub

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I will tell you as a human being calling one with much knowledge recognized by all the Electro geeks who sit in on this site daily. Calling ones comments stupid only shows a possibility of ignorance on the subject. Let me call my buddy Balanced line to join in on this one as all the brains here have piped in asides him. As a new member I give one bit of advice. I dont follow but it might benefit you. Bees swarm to honey. Likely little results if vinegar is spread.
 
Jack the ripper said:
There it is then, you've admitted to running the amps into clipping, why? I'd never clip an amp. NEVER. You shouldn't run an amp into clipping just to see if you have enough power. Running an amplifier into clipping it a stupid idea ANY time, and under ANY circumstances. If you want to see if you have enough power, and what your speakers can handle, the best way is to hire an amp out then run it as hard as you can WITHOUT clipping it. If you still feel your speakers can handle more power, hire a more powerfulk amplifier out, and run that amp as hard as you can WITHOUT clipping that amp either. I'm not trying to offend you, but if you care about your speakers you should never run the amplifier into clipping. Its a stupid idea. You don't have to show me those links to the pictures, or tell me about square waves. I never have clipped an amplifier and I never will. If an amp is running full steam (without clipping) and I feel the speakers can take a bit more power, and/or I need a little more spl, i'll either use a more powerful amplifier or save for another pair of speakers.

In my opinion, even having the clip lights flicker once in a while means you're being silly with you equipment and should use a more powerful amplifier or get another set of speakers. I dont ever want to se a clip light on my system. EVER.
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Jack, Talk to a Live sound professional in your area..

It's Very common to run sub amps to the point of the clip light's just barely
flickering red....It's common practice. Just flickering is NOT clipping the amp if you gain structure is set correctly.
 
DJ SVO said:
When the clip lights barely flicker (That's once in a while not constant flicker) that's 1/3 power that's where the volume stays. I've been running my speakers for years that way and I've never blown a speaker or melted anything. Ever swince I started unning things. I have speakers that are 30 years old and still work perfectly. Compressors and limiters have always been used so mo problem there.

If you want to run the SRX728 with a PLX 3102 you're going to be dissapointed as you'll run out of amp nowhere near where the speakers have been designed to run.
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SVO hit it right on the head....The PLX will run out of steam before the SRX are even warmed up...

Like i said, Big Boy subs, Big Boy Amp! Feeding the PLX with a solid 20amp circuit might help a bit too
 
I dont mean any offence to him, and I even said that, but giving me adivce to clip the amplifier and saying he clips his amplifers, it seems pretty regular, is definately a silly idea. Like I said, I mean no offence but I cant lie and say its a good idea to clip your amplifers just because i'm affraid of offedning him. Its just NEVER a good idea to clip an amplifier. I wouldn't ever run my system that hard. I'd always rather have a lot more power than I need so I can keep the signal at0db maximum. When I say 0db, I mean after setting gain structure, keeping the signal at no more than unity level. Plus you get a lot cleaner signal if you dont go over 0db due to the fact that the signal isn't being compressed. The more you get closer to clipping, the more compressed the signal becomes. Hence the word 'headroom' means having more power than you need so you dont have to get close to the clip point.
 
Precisionpower said:
Jack, Talk to a Live sound professional in your area..

It's Very common to run sub amps to the point of the clip light's just barely
flickering red....It's common practice. Just flickering is NOT clipping the amp if you gain structure is set correctly.
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It definately is common practice, I know, but soun tech guys I have talked to before who work with touring companies and have been in the industry over 20 years also say, you should never clip an amp. I'm affraid, when clip light comes on, it means the system IS INDEED clipping. If you set gain structure properly, which is to say, to make sure all equipment clips at the same same level, by running a pink noise test tone through the system (disconnecting the speakers first) and adjusting all the gain controls so that each piece of equipment's clip light is opnly just being tickled, then turn down the front source, which in my system is the dj mixer, all the rest of the equipment, forward in the chain will stop clipping. Then, I just keep the level on the dj mixer at 0db (unity) and dont go any further, so I got masses of headroom. Plus I run my events from 9pm-5am continuous, its not a good idea to put over 3,200 watts thgrough the SRX728 for that amount of time, even JBL told me that.
 
Yes, jack we get what your saying...

But and occasional flicker of red clip light is not "all out square wave clipping"

The amp manufacturers would never let an amp clip that easy....i'm betting you would have 3 to 6 db to go before you hit anything close to full clip.

What SVO is saying isn't dumb at all, When done correctly..it's fine

I do the same, even with live sound...Guess how many junk drivers i have??

0
 
Precisionpower said:
Yes, jack we get what your saying...

But and occasional flicker of red clip light is not "all out square wave clipping"

The amp manufacturers would never let an amp clip that easy....i'm betting you would have 3 to 6 db to go before you hit anything close to full clip.

What SVO is saying isn't dumb at all, When done correctly..it's fine

I do the same, even with live sound...Guess how many junk drivers i have??

0
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Yeah I know its not all out clipping, but it IS clipping, and I dont want to get that close. To me, in my opinion, its like getting as close to the edge of a cliff with nothing stopping you from falling, and seeing how far you can get without falling. Its dangerous, especially seeing as its not leaving any headroom at all. What if some drops the microphone? Or a dj accidentally or intentionally turns up the bass or gain more than what you set it at? You're nackered then, thats it, game over. Say hasta la vista to your speaker's cones.
 
The light starting to flicker is an indication that you're on your way to clip not clipping in itself. As Precisionpower you still have 3 or 6 db remaining before clipping now how many more watts are needed for 3 more db's. My top amps never see flickering and I run those Yamaha's with either RMX2450's or or PLX2 3102. I've never had the safetey switch on the Yamaha's cut off my high's nor have the LF drivers over been damaged. Remember the dynamic range of the music is very big and where your amps use the most power is reproducing the low's.

I have a big amp arsenal at my disposal and have experimented with many different combinations and using the bigger amps always gives me excellent sound coming out of them.
 
3-6db left before REAL clipping takes place? Not from i've been told by QSC who I emailed about this very subject about 3 months ago when I was wondering about the level that the amplifers clip at. They said that when the clip light comes on its bad, which is something that I already knew.
 
Then buy the 3102. And don't worry about blowing the SRX728 by overpowering. Constant red is bad, slight flicker now problem. But it seems you've already made up your mind so I'm out.
 
I'm not stubborn, I understand you let your amps clip, but I dont, and have been told by a lot of sound engineers with years and years of experience that it is indeed bad. Don't get annoyed just because I dont clip my amps, but you do. I do think your silly for doing it, but hey, i'm not gonna start having a go at you for it, its your decision, and thats cool.
 
Jack the ripper said:
3-6db left before REAL clipping takes place? Not from i've been told by QSC who I emailed about this very subject about 3 months ago when I was wondering about the level that the amplifers clip at. They said that when the clip light comes on its bad, which is something that I already knew.
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Of Course QSC's warranty dept will tell you that!!!:sqlaugh:
 
Jack the ripper said:
I'm not stubborn, I understand you let your amps clip, but I dont, and have been told by a lot of sound engineers with years and years of experience that it is indeed bad. Don't get annoyed just because I dont clip my amps, but you do. I do think your silly for doing it, but hey, i'm not gonna start having a go at you for it, its your decision, and thats cool.
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He's not clipping his amps....why do you keep saying that??? if they were indeed clipping, He would be replacing speaker's like Cam
 
Thanks Brian. Rip you have talked to sound guys who promote a product and if they upsell you with scare tactics who is going to pay? So it seems a balance of power handling speakers or enough power to sustain maximum quality of sound through those speakers. You continue to belittle SVO even when saying you mean no disrespect. Throwing around silly and stupid in comments about his methods and his offerings here. I wouldnt expect Chinese products to hold up to constant lighting to withstand steady beatings having such flimsy components. However, precision gear thrives efficiently when powered with plenty of oomph, often not becoming efficient until opened up per the SVO comment about Engines running 50 MPH down the road or in some parts of the world running at 80Km per. The high end motors are just getting going.
 
Jon Tuck said:
Thanks Brian. Rip you have talked to sound guys who promote a product and if they upsell you with scare tactics who is going to pay? So it seems a balance of power handling speakers or enough power to sustain maximum quality of sound through those speakers. You continue to belittle SVO even when saying you mean no disrespect. Throwing around silly and stupid in comments about his methods and his offerings here. I wouldnt expect Chinese products to hold up to constant lighting to withstand steady beatings having such flimsy components. However, precision gear thrives efficiently when powered with plenty of oomph, often not becoming efficient until opened up per the SVO comment about Engines running 50 MPH down the road or in some parts of the world running at 80Km per. The high end motors are just getting going.
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This was taken from a thread on the ProSoundWeb forum, Relating to "how to power JBL SRX 728's"

Adam, don't assume I was just talking about an xti4k.
I've been quite intimate with the 728s for about 3 years now (well, as intimate as someone can be with woofers...), and I've pushed them with lots of amps.

They sound better with more than 3kw.
Period.

That was the general consensus among the guys using them. The original poster "Jack Smith" was this you...."Jack The Ripper"??

Put an honest 3,000-3,200 watts into them and be tickled.

Remember, a 15amp wall recepticle will support about 1,800watts.
 
The venue where I do parties at only has 13A current, so 15A is out of the question. But I will definately be giving each amplifer its own wall socket, and not putting the amplifier on a 6 way trailing socket along with all the lighting, dj mixer etc....because I know that the amplifiers need their own power and every ampere of current that they can get.
 
DJ Cam said:
With 13A of current it's not going to work.

At that note I do not know what to suggest.
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Hey? What do you mean its not going to work? Of course it'll work? Haa haa. How can you tell me that amp wont work? The electricity in the uk is 13A/230V, of course it'll work. :sqrolleyes:
 
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