Question about JBL S312 Main / Stereo Speaker

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JBL s312 studio series.

Thes speakers are 250 watts....each. I want to Upgrade the crossovers and the drivers...can these be possible??? Thanks.

BTW..I want to Upgrade to a 400 watts per  speaker.Any recomendations?

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Posted on Dec 19, 2008

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SOURCE: JBL S312 lacks "punch" in bass response

Hi sherrjam,
I was the guy that was complaining regarding the lack of slam with JBL S312II's.
The problem was solved by upping the amp power to 300W RMS per channel (got two NAD C370's as monoblocks, 300W RMS each).
Get yourself an amp that can put out 300W per channel and you won't be complaining about the lows of S312II's :-)
Regards, Damir

Posted on Jun 09, 2009

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SOURCE: equipments as follows... 1 behringer ep4000-

First let's clean this up. All that stat stuff is just clutter.

equipments as follows...

behringer ep4000

behringer ep2500

2 yamaha s215v

jbl mrx 518

behringer crossover cx2310

How do you connect them properly? According to the manuals, particularly the one for the s215v's. Page 5.

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Posted on Mar 30, 2011

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JBL JRX115 producing very muffled sound even though graphics on mixer at normally used settings. Someone suggested we may have "popped" the horns. Is this potentially the problem. We have been running...

The speakers are rated 250 Watts. Driving with 600 Watt amps requires one to be careful of how much the volume is turned up to avoid damage. You MAY have damaged more than just the compression drivers on the horns but the voice coils on the 15 inch speakers as well. Further use could also damage the amplifiers. You did not mention what brand amps and it is possible they have a problem.

You best replace the units with ones rated for the power of the amps as restoring them on short notice for a gig is not practical.

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setting Crossover frequency is trying to find the best frequency where the sub will see below that frequency and the es100 will see above that set frequency for maximum speaker efficiency.

8400P, i believe has a adjustable crossover frequency or cut frequency from 50-150Hz.

The e100 has a rated frequency response of 32Hz to 40kHz. So, the lows going to the sub, will allow the es100 to not have to handle deep bass frequencies.

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JBL S312 lacks "punch" in bass response

Dear friend....Why you dont join to my proyect???? See? I love my JBL s312 II .

I been getting drunk on them many times.And They have served Very well.

After 5 years of critical listening....i started hearing some descoloration just in 5% of my music. The Bass was an issue for me..i mean the same problem.After all this time I decided..what the hell...let me open these babies and let me see what are they made of.

To My Surprice......I saw a mother board with a very poor components.....I was so mad.But...wait a sec....They have served well all these years...I could not get rid of them like that....Well?

I got in touch with a guy over the internet.He told me that MY crossover components are bad. basically....capacitors of 2 dollars,and...inductors of 5 dollars....yes yes yes (Shame On You JBL)

Anyway....basically...I am Upgrading the same crossover same values with better components....I have not done yet but I already have all the pieces and components.I will let you know how it goes.
It can no go bad....see? Same components......just better quality that's all.

Like the orange juice....sunny delight vs tropicana my friend....

In this case.... Electrolitic capacitors vs Polypropylene capacitors = image,authority,performance.Dinamics.

Now to be honest...I dont know yet the results ok..because I have to put all the parts together. But In 100% accurate.

Better components better results. If I were you.....and dont want to take this huge steps like me....Just take the crossover and change the capacitors to a better one( Polypropilene capacitors)
And you will for real heard improvement.

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The JRX series have weak HF drivers, only rated for some 25 watts or so. Are you running in Bi-Amp or straight? Could be bad capacitors in the crossovers. Could also be clipping of your amp, a common cause of failure is using too small an amp and pushing it past it's clean operation limits. Speakers don't like square waves. Was the "Clipping" light flashing on the amp?

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It is possible that the main drivers are damaged, or that the internal crossovers are damaged, or there may be internal fuses that are blown. If these are using internal power amps, there may be a fault in the power amp sections.

Jerry G.

May 04, 2008 | Audio Players & Recorders

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