Question about JBL PSW1000 Speaker

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Double coil sub woofer

I hav double ciol sub woofer & i made a box accoding to its measurements.i connected two coil serially.its 4ohom 500 max watt per coil.since searially connected it soud be 8ohom & 1000 max watt for the bffle.is it ok connecting serially?

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SOURCE: I get feedback sound from the sub woofer when it's

I pulled this up for you to review , its a quickie on the subwoofer and why how where they function, I suggest you contact JBL Customer service and ask for Tech Support on this if all else failed, they may have a quick fix kit to install (Servo) to suppress the feed back. Background on Subwoofers Subwoofers are designed to produce only the very low end of the music spectrum. Most subs perform between 20 and 80 Hz only. Though the exact range varies depending on preference. In order to filter the frequencies above 80 Hz, you need a high-order low-pass filter. We chose to build a 24 dB/octave filter at 90 Hz by cascading two 2-pole Sallen-Key filters together. This filter can be bypassed if an external crossover is to be used. There are also many types of subwoofer enclosures ranging from 2nd order IB, to 6th order bandpass that we could choose from. Each design is more complicated than the first and much more difficult to achieve predicted results. In our case we chose to go with a 2nd order sealed (or acoustic suspension) because of simplicity and accuracy in achieving predicted results. Also sealed enclosures have a more linear phase response with relationship to frequency. They have a naturally more shallow roll-off rate of 12 dB/octave. So it can be argued that in a sense they yield the most low frequency response. Also a sealed enclosure has more control over the motion of the cone. Since we are actively monitoring the motion of the cone, we wanted to make sure that it was tightly under control to begin with. The driver has less of a tendency to bottom out in sealed enclosures. Overall it was a much better design approach to go with that any of the others.
A subwoofer must also have a really good flat response curve. Below you will see the response curve of our subwoofer as it was after we built the enclosure and mounted the subwoofer. An air tight seal is essential. This can be checked by pressing in the cone and then watching how fast the cone moves back up to its rest position. Our cone sure enough took about 3 seconds to return so we were definite we had a good sealed box. [It was pointed out to me recently that this is actually an indication of a small leak in the enclosure. With a truly air-tight enclosure pushing in the cone will actually compress the air inside that when released will result in the cone springing back rapidly, not slowly, to its rest position.]

Posted on Aug 16, 2010

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What is the wattage breakdown for each speaker on my pair of Pioneer CS-N575 3 way speaker towers (I know the total max power combined output is 150 Watts)?


It's the woofer that will use almost all from this 150 W so if you replace woofer take one of 8 ohm which can handle 150 W and you done

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Anyone know where I can find a replacement woofer for a Cerwin Vega HT-S12A? It is a 12 inch woofer...The cabinet and amp are in great shape however a stupid kid came over and cranked the sub and seems to...


  • Sounds like the speaker coil to me.
  • Yours is a a 150 watt, 12" subwoofer. If I were you I would not knock my head on the table looking for a Cerwin Vega to put into there. You can a far better quality one for a reasonable price. This Pioneer here.
http://www.google.com/products/catalog?q=12%22+woofer&hl=en&prmd=ivns&bav=on.2,or.r_gc.r_pw.&biw=1600&bih=799&um=1&ie=UTF-8&cid=5529109873222407637&sa=X&ei=glO6TamAB-L00gGzvKmNAQ&ved=0CLoBEPMCMAM# I
  • I don't see that Amp blowing this speaker and it averages about $75. Just turn the box on it's side and remove the screws holding the speaker in place. Drop the speaker. Remove connectors and revers to finis the job.

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How to hookup


hi,
if u want to hook up the sub with ur av receiver the connect the sub woofer output of ur AVR to any one (left or right) input of ur sub woofer. then connect its power . set the frequency range between 90 and 120Hz. set the volume of sub woofer to 40% of its total. also check the av receives speaker setting. goto speaker setup and make ON the sub woofer out.

if want to connect the sub to a stereo amp without sub out. then connect the amps speaker line to the speaker input of sub woofer and connect the speaker out of sub to left and right speaker ( make sure to connect the red to red and black to black). set the volume and frequency as above
ok

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How it can be connected to a stereo amp


hi,
if ur amplifier have a pre out, then u can connect that to ur L/R input of ur sub woofer.

if not the only way is, connect ur amplifiers speaker output to sub woofers speaker input and then connect ur speaker to sub woofer speaker output terminal. remember don't inter change positive and negative wires.

if ur amplifier have speaker A,B connection then it is very easy. connect the speaker A to ur left and right speaker. then connect speaker B to ur sub woofer's left and right speaker input. be sure to make that speaker A and B switch is in on position. the power on both and check it. ( use good quality speaker cable to connect the sub woofer)

your sub woofer is designed to work , both at low level and high level input.
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The volume control pot can be replaced.

Any good quality audio shop or electronics repair shop should be able to fix this.


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Replacing sub speaker


I wouldn't try reinventing it by replacing the driver. Drivers and their enclosures are designed to work together. And this being a self-amplified subwoofer, there is one more piece that's electrically optimized to the rest. Don't mess with it.

Why don't you just set your receiver's individual relative speaker volume levels so the sub isn't weak by comparison to your other speakers? Weakness, as you call it, is relative.

Is your receiver properly channeling Low Frequencies to the sub? Experiment with the cutoff, too.

This problem doesn't require meatball surgery.

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Second is via a low level output from your receiver / amp to the low level input on your sub amp. This is normally done via a RCA type of patch cable and connected to the sub woofer RCA jack on the rear of the source receiver or amp, Next run the patch cord to the sub amp an into the RCA jack input. IF you have a right and left input, use the Right input.

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