Question about JBL S312 Main / Stereo Speaker

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JBL S312 lacks "punch" in bass response

I have a set of JBL S312's. These speakers are actually noted for thier strong bass response. The bass is wonderfull at low/moderate volumes (90db - 95db) however when I "crank-it" (95db - 105 db) the bass response becomes flacid. I like the tight punchy bass response of the speakers at low volumes - how do I achieve this at higher volumes? I am currently using a JVC RX-517 AV reciever and at first I though this was the culprit so I swapped it out with a Yamaha RX-596 stereo reciever (80 wpc @ 8ohms), there was a very small improvement. I suspect that the problem I am having is a combination of poor damping factor rating of the amplifier combined with a large 12" driver "pushing back" on the amplifier. The Yamaha (which I suspect is the better of the two recievers) has a damping rate of 240 (not bad), I suspect that if I had an amplifier with a respectable damping rate of 500 or higher I would achieve beeter controll of the woofer cone which would result in tighter/punchier bass? I have read a review of a guy with the same speakers (JBL S312) and a NAD 370 and he complains of the same problem which made me scratch my head, I assume that NAD amp have a good damping factor? Please offer your oppinions (cost effective oppinions)

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  • sherrjam
    sherrjam Feb 18, 2009

    It has been my experience that cutting upper bass (250 hz) by -6db to -12db can help eliminate “muddiness”/”boom” however this is not the case, I am lacking “punch” – the type you can feel in the chest. I have experience in sound reinforcement (as an enthusiast only) and I never had to cut or limit low frequencies to improve the perception of bass. I know many people feel that sound reinforcement products are crude and completely different than home speakers however they are very similar. What makes sound reinforcement speakers inaccurate is due to their need to be efficient (in many cases up to 100 db spl at 1w). Their construction is very impressive – massive magnets with robust cast aluminum baskets, edge wound (flat wound) voice coils. At any rate I don’t want to discount your advice I will try it and report back with my results.

  • Gio107 Mar 13, 2009

    Samne with me.....same problem....what about Upgrading the drivers??? what about having the same crossover done again with quality components.....maybe better coils,better resistances..etc.

    I think thise will work just fine.What about upgrading  the 12" woofer with a more powerful 12" woofer more  efficient one???



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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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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.

Posted on Apr 06, 2009

  • Gio107 Jun 09, 2009

    Here is the solution...check my videos.
    Hope it helps.


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The one thing I have noticed with all speakers( no matter what brand or cost) The higher the volume you need to adjust your bass just a little lower, because at high volumes the power draw is so demanding for the speakers they can not keep up with the rate of the music, so lowering the bass a little at high volumes will allow the subs to be able to keep up with the music

Posted on Feb 18, 2009

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