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JBL SR4732 amps????

Hello Tech48,

I just recently bought 4 used JBL SR4732 and was wondering how to power them. Would I need 3 seperaate amplifiers like the Crown 1200 for the highs, the Crown 2400 for the mids and the Crown 3600 for the lows?
Here are the Specs for each JBL speaker:
Lows 1200 watts @ 8 ohms each
Mids 150 watts @ 16 ohms each
Highs 40 watts @ 8 ohms each
a total of 1200 watts each speaker.
I currently have a Yorkville 6040 which I use to power my Cerwin Vega bass bottoms (LR36 with 750 watts RMS/1500 peak)
I also have a Numark equalizer (model ex1500)
Alesis 3630 compressor limiter with gate
Ashley stereo 4 way crossover (model xr88e)
any help connecting all this is greatly appreciated.

Posted by on

5 Suggested Answers

  • 54 Answers

SOURCE: bi-amp

After examining a picture of a 5802 ( I have been servicing adcom for over 20 years ), these are not bi amp posts, but bi wire posts.

Bi-amp means that 2 amps are being used, one for highs, one for lows. This means that you have no crossovers in the speakers, instead, you have an electronic crossover between the amps and the pre-amp. The highs and lows are separated in the electronic crossover. One amp handles the lows, one handles the highs.

Bi-wire means that you have the crossovers still inside the speakers. The amp handles the full range of music ( highs-mids-lows ). Different kinds of speaker wire produce different results. If you have bi-Wire terminals on your speaker, they come with shorting wires, that tie the tweeter + to the woofer + on the back of the speaker, and the tweeter - to the woofer - . When the shorting wires are removed completely, you have now electrically separated the tweeter and woofer from each other, while maintinaing the crossovers ( inside the speaker ) for each.When this is done, you can now bi-wire the speakers and amp, and use different kinds of wire for the lower frequencies and the upper frequencies, depending on your ears ( everyone hears a little differently, thats why there are so may makers of components, and wire ).

Why do we have crossovers?.....the tweeter voice coils ( the things that make the sound ) are made of hair thin wire. This wire cannot handle much power and if you were to put bass in to a tweeter, you would burn the tweeter out almost instantly. A tweeter is a very light, fast moving device which can react very quickly to high frequency sounds ( symbols, triangles, guitar strings....). Woofers are more rugged. They have voice coils made of heavier wire and are designed for larger movements that Bass demands. Subsequently, woofers aren't very good for high frequencies because they are slower devices.

So what do we do ?.....Keep the lows away from the tweter and the highs away from the woofer.....thats the job of the crossover.

In the event that your speaker has the crossover OUTSIDE the speaker box, you should check ( as always ) with the manufacturer of the speaker to see how it can be changed to suit your needs. Remember to always read and follow your owners manual. Good luck....Rob

Posted on Mar 03, 2008

  • 319 Answers

SOURCE: home amplifier

Hum is probably due to insufficent grounding somewhere. Make sure coax cables at input are good. Re-locate unit away from aplliances

Posted on Apr 17, 2008

tech48
  • 624 Answers

SOURCE: trying to hook up jbl

These JBL speakers are not made for a home stereo reciever. It could be part of the problem.

I do know that they have a high frequency input and a full range input on each speaker.

I am going to guess that maybe you have them connected to the high frequency input.

Are you using 1/4 inch jacks connecting to the input of the speakers?

I don't remember these speakers having a input for wires.

You may have another issue using these speakers with that reciever.

The JBL speakers are 4 ohms each, it is very likely that the onkyo requires 8 ohm speakers.

Look on the back of the Onkyo where the speaker jacks are at and see if it says anything about the minimum impeadance.

The impeadance is the ohms. Most home recievers are not designed for anything less than 8 ohms. Some are, but most are not.

Using 4 ohm speakers on a system that requires 8 ohm speakers can cause damage to the reciever. Mostly at higher volume levels, it will cause the reciever to overheat and shut off, maybe short out a channel. It pulls 2 times the amount of current thru the output transistors as 8 ohm speakers.

Let me know if this helps you or if you need more help.

Posted on Jun 20, 2008

asnowman
  • 788 Answers

SOURCE: 3 8 ohm speakers 1 stereo amp 2channel a 1 channel b will this do dammage

If you only have 3 (8 Ohm) Speakers and want to hook them all up, you will need to balance the impedance of the sides or you will be too loud on one side and not loud enough on the other. This will cause your amp to work harder on one side. (Not Good)
I did not see the speaker A and B in the instruction manual.

Because of that, I will state the following.
I would not recommend that you hook up anything that is unbalanced. I would use just a pair in two channel mode (This would give you an 8 Ohm load on each output). The manufacture recommends a 4 Ohm load for the best output of this amp. But the most important thing to remember is that your speakers must be able to handle this much power or the speakers will be permanently damaged.
This amp has Protection to cover: Full short circuits, Open Circuits, Thermal and HF protection, and stable into reactive or mismatched loads.

You could hook up all three speakers and the amp will work, but, I would not recommend that type of hook-up.

I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread.
If I have managed to answer your questions and have helped you, please help me, and rate this suggestion the highest FixYa rating. If you cannot give this post a “FIXYA” (Two Thumbs Up) rating then please comment to this post and I will try to help you further.

I try to provide the best FixYa experience.

Posted on May 23, 2009

dunnbiker
  • 8546 Answers

SOURCE: I have a s1500 samson amp I keep blowing speakers,

Turn the volume down? Feed it cleaner source material?

http://s3.amazonaws.com/samsontech/related_docs/s1500_s2000_manual.pdf

You don't say under what conditions you're blowing them or if any of the informative indicators are warning you of impending doom. The Samson is capable of cooking just about any home speaker.


The following conditions will cause the Protection LED to go on:


Initial power-up: For approximately five seconds after initial power-up, the

protection circuitry is activated and the speaker output is muted. If everything is

operating normally, you will hear an audible click at the conclusion of this brief

period, as the protection circuitry is deactivated and the S1500 / S2000 begins

delivering signal to connected speakers (at which point you'll hear a click). It is

normal for the Protection LED to fade gradually after the amplifier is powered off.

Overheating: A temperature sensing device in the S1500 / S2000 will cause

the protection circuitry to be activated (and the Protection LED to go on)

whenever the operating temperature of the unit rises above a safe level. To

guard against this problem, make sure the S1500 / S2000 receives adequate

ventilation on all sides and that both the front and rear panels are unobstructed.

Severe overcurrent conditions: This occurs whenever the signal being input to

the S1500 / S2000 rises to a level above 20% THD (Total Harmonic Distortion).

Shorted speaker cables: This will occur if, due to faulty wiring, the hot and

ground signals being output by the S1500 / S2000 short one another.

Output impedance drops below 2 ohms: This can occur if the S1500 / S2000

is connected to inappropriate speaker systems (see the "Setting Up and Using

Your S1500 / S2000" section on page 5 in this manual for more information).

DC voltage detected at speaker output: The most likely cause of this is an

internal failure.

In general, any time the Protection LED lights up (other than during the

approximately five seconds following initial power-up), there is reason to be

concerned. If this occurs, turn the S1500 / S2000 off immediately and carefully

check all wiring and external devices in order to locate and correct the condition

that caused the LED to light up in the first place.

For further assistance, contact your local Samson dealer. If purchased in the

United States, you can call Samson Technical Support (1-800-372-6766)
between 9 AM and 5 PM EST.

Posted on Feb 07, 2011

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