Amp for JBL SR4722A speakers

[Jwallace1]

i have a an opportunity to snag a few of these speakers and want to use them in my shop. not knowing a lot about audio is this something usable in a large home shop ? looks to be 600 Watt 8 ohm per, assuming you would need a fairly large amp to power these

thanks in advance for the education

thanks

 

[Fierljeppen]

Those would be very appropriate speakers for a large home shop, assuming you want the ability to "rock the house" at times.

Are these the speakers you're looking at?



You'd need a nice commercial (600-1200) watt 2-channel amp / cables. Late model used QSC amps with those specs can be had for a very reasonable price, even on eBay.

Here's the specs for the speakers. There's many more knowledgeable members than myself and I want to give them enough information about the speakers in question to educate the both of us.



Whatever you do, listen to the speakers before you purchase them. It's a buyers market for pro audio equipment.

 

[Jwallace1]

That's the ones there is 4 available. Would love the ability "rock the house" just not super familiar with kind of audio stuff. Will be very interested in some education

 

[Metal-Marc]

there is 4 available.

Oh yeah. Get all four. Install one in each of the four corners of your garage. Get two used pro amplifiers, QSC amps for instance, and you're ready to rock the house.

 

[Jwallace1]

looking at amps i see mostly 2 channel so i would need 2 amps to run all 4? can someone explain the connections on the back of the speaker and the cabling required ?

thanks

 

[ltusler]

The speakers are pretty efficient, so you don't need tons of power, but more is better than less. They are a 2 wire 8 ohm connection unless you biamp then and use a speaker controller DSP which is an advanced subject.
The round connector in the middle is called a Speakon connector. It is a 2 or 4 wire locking connector. You can get them at Parts Express, Most pro amps will have the same.
You will need 4 channels of power to drive them all. Pro amps aren't really "stereo" just called 2 channel. They can run in 2 channel or bridge mode.
You will need separate sources to drive pro amps.
You can also drive them with a traditional receiver. Just make sure there is enough power to drive both the A and B outputs without clipping at high volumes and you're all set,

 

[Jwallace1]

The speakers are pretty efficient, so you don't need tons of power, but more is better than less. They are a 2 wire 8 ohm connection unless you biamp then and use a speaker controller DSP which is an advanced subject.
The round connector in the middle is called a Speakon connector. It is a 2 or 4 wire locking connector. You can get them at Parts Express, Most pro amps will have the same.
You will need 4 channels of power to drive them all. Pro amps aren't really "stereo" just called 2 channel. They can run in 2 channel or bridge mode.
You will need separate sources to drive pro amps.
You can also drive them with a traditional receiver. Just make sure there is enough power to drive both the A and B outputs without clipping at high volumes and you're all set,

i really appreciate the information, is there any brand amp i should be looking at? QSC was mentioned above. looks like most in that style are rack mount which isn't a big deal i can find that cheap enough or probably free.

 

[ltusler]

QSC is what I use Crown and Carvin are also good, I would stay away from the low end brands. I just put stick on feet on the bottom and stack them. They flow air horizontally. I use them in my main 2 channel bi amped system with the fans disconnected. They never even get hot.

 

[Jwallace1]

Thanks

So looking at the specs of the soeaker they are 600 watt 8ohm so If I wanted to power 2 of them I would need a 2 channel 600 watt per channel at 8ohm?

Thanks

 

[mike93lx]

No, that is nuts. You wouldn't be able to stay in the shop with them at 600 watts.

100x2 at 8 ohms will play them louder than you will ever want.

 

[Jwallace1]

Ahh ok. So the 600 watt would be max output. I'll start looking for something

Thanks

 

[mike93lx]

Ahh ok. So the 600 watt would be max output. I'll start looking for something

Thanks

I'd look for a used stereo receiver from Yamaha, denon, Marantz, Sony, etc.

Most of the time, you'll probably be using about 20 watts. A little goes a long way

 

[Metal-Marc]

My ascii art schematic.

What is cool with four speakers, is you alternate L-R/R-L in the room. Unless you are dead center, you will have some stereo imaging happening. anywhere you stand in the space.

 

[Fierljeppen]

I'd look for a used stereo receiver from Yamaha, denon, Marantz, Sony, etc.

Most of the time, you'll probably be using about 20 watts. A little goes a long way

Uh, no. If he's going to crank those speakers, he'll need a lot more power than the amps you mentioned. Underpowered amps damage speakers a lot more than overpowered amps. The hi-frequency drivers won't need much power, but the woofers will.

20 watts, are you kidding me? 200 watt RMS rated amps were fine for my home speakers, but I've always needed (600w-1200w) commercial amps to drive all of the pro audio speakers that I've owned over the years in order for them to sound proper.

I don't think you listen to music the same way the OP intends to, at times.

 

[Metal-Marc]

Most of the time, you'll probably be using about 20 watts. A little goes a long way

Yeah, nah. It's best to have the amp pushing more or less twice the watts the speakers can handle.

Reason being that when the amp starts to saturate, and this is not always obvious to the ears, the amp sends square waves to the speakers, DC current, and that will kill a speaker fast.

When it's the other way around, where the speakers are saturating/distorting before the amp, it's very obvious and annoying, and it takes a bit longer before the speakers start to deteriorate.

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[mike93lx]

Yeah, nah. It's best to have the amp pushing more or less twice the watts the speakers can handle.

Reason being that when the amp starts to saturate, and this is not always obvious to the ears, the amp sends square waves to the speakers, DC current, and that will kill a speaker fast.

When it's the other way around, where the speakers are saturating/distorting before the amp, it's very obvious and annoying, and it takes a bit longer before the speakers start to deteriorate.

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Choosing the right power amplifier is critical to the quality of your live sound system. Sweetwater shows you how to pick the best amp for your application.

www.sweetwater.com

Oh, I know overhead is good. I used to sell this stuff and owned a bunch. But saying a 600watt amp is the answer is a bit over the top

 

[Jwallace1]

there is a guy locally selling a couple crown XLS1000 amps looks like they are 215w at 8owm. ill have to explore Ebay and see what i can find

thanks

 

[mike93lx]

there is a guy locally selling a couple crown XLS1000 amps looks like they are 215w at 8owm. ill have to explore Ebay and see what i can find

thanks

You'll need a preamp as well. That's an advantage of a receiver.

You can also get a receiver and if you want more power, add on amps later.

 

[Metal-Marc]

I used to sell this stuff

Never trust or listen to a salesman over technical issues.

But saying a 600watt amp is the answer is a bit over the top

With 600W of power capacity for the speakers, he'd be good with a 1000-1200W per channel power amp so as not to blow the speakers.

It's a logarithmic scale. Twice as loud as 25W is about 625W (25 square or 25 times 25).

 

[Metal-Marc]

a large home shop

How large is large?

 

[Jwallace1]

How large is large?

40x60 but I use it in 2 20x30 sections

Thanks

 

[mike93lx]

40x60 but I use it in 2 20x30 sections

Thanks

One of these for each channel might be enough. Not sure if you'll be able to hear it all.the way across that monstrous warehouse. I'm just a salesman with some vested interest in what you buy, I guess

What if you decide to host a festival?

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[mike93lx]

Uh, no. If he's going to crank those speakers, he'll need a lot more power than the amps you mentioned. Underpowered amps damage speakers a lot more than overpowered amps. The hi-frequency drivers won't need much power, but the woofers will.

20 watts, are you kidding me? 200 watt RMS rated amps were fine for my home speakers, but I've always needed (600w-1200w) commercial amps to drive all of the pro audio speakers that I've owned over the years in order for them to sound proper.

I don't think you listen to music the same way the OP intends to, at times.

Lol.

"underpowering" doesn't damage speakers. Dumb users that clip their amps can, though

Wait till you find out the power output of typical tube amps. They must blow speakers left and right, I guess

 

[4x4Pete]

Seems to me with those speakers and high powered amps he'll have a dance club rather than a shop. What about the acoustical problems with big square rooms and the sound bouncing all over the place? Mike is right. A 100w receiver should be plenty to party to in there. The speakers are way overkill. I have an old Sansui receiver with a couple of floor standing speakers on shelves. Past 3 on the volume and it's plenty loud to party to. Talking, not so much. My receiver might be pushing 20 watts at that point. It's rated at 120w/channel at .02% thd.

 

[crewchief888]

FWIW i run an old peavy CS400 and Kustom 15" speaker cabs in my basement.

i run JBL studios series speaker and a powered JBL sub in the garage, with a simple 2channel receiver
the garage is loud enough to (probably) annoy the neighbor
the downstairs system is definitely loud enough to annoy the wife

 

[ronr80]

I have 4 speakers 1 10 inch sub, and my amp is a Yamaha R-S500, natural sound 2 channels , and it runs all 4 speakers real nice. The Nikko is for the sub , EQ is just a bonus. Yamaha is 120 watts per side . Agree with post #10

 

[ronr80]

I have no neighbors to annoy , but most people that come here always say that the sound system is better than we have in our house.

 

[Bert_]

I've got a 125w/ch pa amp and (2) 91db/w/m 3 way speakers. Back in college, having parties, it was great. Drown out all the noise of 30 drunken people. Now I can't tell you the last time the volume control has been over 1/2 for more than a few seconds. Now remember the OP has speakers 5x more efficient.

I'd look for a used stereo receiver from Yamaha, denon, Marantz, Sony, etc.

Most of the time, you'll probably be using about 20 watts. A little goes a long way

Best advice in this thread.

20w into 98db/w/m speakers will be loud. Not concert level but more than you will ever want in a shop.

I think a lot of people either didn't look at the sensitivity or more likely have no idea what it means.

 

[ItsNemo]

I've used the old SR4732A's which were the big 3 ways and have owned my fair share of QSC and JBL gear over the years (currently still have a PLX3102 kicking around and then QSC K12.2's, K8.2's, KS112's...used to own an RMX1850hd and JRX125's and TR125's).

The 4722's will get plenty loud indoors on 100 watts for normal non rock concert listening. 98db sensitivity is 1 watt 1 meter, so with 100 watts, you're looking at around 118db continuous at that same distance. Most home speakers would be lucky to get into the 110db+ range without sounding like complete ****. Efficiency is a thing, most PA speakers have a lot of it. What you will miss is the bass, they are 10db down at 50hz, so practically speaking you don't have usable output below probably 60hz.