Question about JBL S312 Main / Stereo Speaker

3 Answers

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)

Posted by on

  • 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???


3 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

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

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 2 Answers

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.


  • Level 1:

    An expert who has achieved level 1.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 7 Answers

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

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Find a JBL n24aw replacement speaker

Looks like the woofer is a 4" Polyplas shielded driver, part #NS-W4SS, 4 ohms. If JBL can't supply a replacement try looking at Madisound or Partsexpress. Find a 4" 4 ohm woofer or mid-bass driver with a round frame. Check the actual measurements against your driver because not all "4 inch" drivers are the same size or bolt pattern. Make sure the depth will fit. You don't need "shielded" unless the speakers will be right up against a CRT (and nobody uses CRTs these days). Get a pair and replace both because the new driver certainly won't match the old.

Take a look at the Dayton Audio RS100-4 from Parts Express (or Amazon). The Hi-Vi M4N from Madisound "may" work but it is 8 ohms.

Sep 05, 2014 | JBL Audio Players & Recorders

1 Answer

I think the subwoofer power light should be green when the bass is working and it stays red with very low bass output. Not sure if I blew speaker or if connections are off, seems to be subwoofer itself. ...

If it makes any sound at all the speaker is probably not blown, the connections are probably on and the fuse is ok.

You don't say to what it is attached and if the setup for bass/lfe managament settings produce the same or a different result than program material does.

You also don't say how the sub is driven (speaker level or Line Level) and if it's a full-range or low-frequency-only input. All these things matter, as does your source electronics and its settings for bass management.

Try setting the low-pass higher and the high-pass lower.

The manuals would be a good place to start. Go to

Dec 23, 2010 | JBL PSW-D110 Speaker

1 Answer

Can we use the subwoofer as an amplifier for speakers? it has jacks for speaker in/out, but i can't figure out how to make it work because the speakers have no sound.

I don't believe this hookup is amplified; but, if you have used the regular unfiltered speaker connections from your receiver/amplifier to hookup the subwoofer, the system will pass the signal thru the outputs subject to the crossover adjustment on the back panel. You cannot get the full signal if your system is sending only the bass signal to the subwoofer. I have copied the instructions below from the manual. You would set the high freq crossover to the low end of your satellite's frequency range. The full manual is here:

High-Pass Control
• If you hooked up your subwoofer
as shown in Hookup
3 on page 4, you also have
the capability of adjusting
the high-pass frequency.
The High-Pass control
determines the frequency at
which the main speakers
will start reproducing
sounds. If your main speakers
can comfortably reproduce
some low-frequency
sounds, also set this control
to a lower frequency
setting, between 50Hz –
100Hz. This will concentrate
the subwoofer’s
efforts to the ultradeep
bass sounds, while your
main speakers continue to
reproduce the mid-bass
information. If you are
using smaller bookshelf
speakers that do not extend
to the lower bass frequencies,
set the high-pass crossover
control to a higher setting,
between 125Hz – 180Hz.
With this setting, your main
speakers will not have the
burden of reproducing any
low-frequency sounds.
• If you hooked up your subwoofer
as shown in Hookup
1 on page 3, the high-pass
frequency is fixed at 180Hz.
• If you hooked up your subwoofer
as shown in Hookup
2 on page 4, there is no
high-pass control. Unless
your receiver/amplifier
incorporates a high-pass
crossover, your main speakers
will continue to get a
full-range signal.
Final adjustment and blending
of the low-pass and high-pass
controls may evolve over several
listening sessions. A good
starting point would be to set
both the low- and high-pass
controls to the same frequency
and adjust from that point.

Sep 07, 2010 | JBL PSW-D110 Speaker

1 Answer

Crossover to Es 100 to JBL 8400P. I have Harmon kardon 460 reciver?

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.

So, I would suggest starting at 100Hz. That would mean your sub will be seeing roughly 100Hz and down, and the es100 will see roughly 100Hz and up.

Listen to your favorite music, and adjust accordingly.

Apr 05, 2010 | JBL Studio L 8400P Subwoofer

1 Answer

No bass response

Seems there are 2 underlying problems-

no am/fm? are antennas connected? is there static active on any station tuned to?

in terms of low bass response- double check settings both in the receiver and also on the sub itself if any available.

Jan 14, 2010 | Bose Acoustimass 5 III System

1 Answer

My JBL Eon15 g2 has a cracklin sound within the main component when the bass is turned up. How can I fix this?

it can be the amp or the speaker itself. it has to be diagnosed by a service center.
if the amp is the problem, there can be board replacements or component level repair. if it is the 15" speaker, then it can be reconed with authentic genuine JBL parts returning it to brand new.

Jun 21, 2009 | JBL EON 15-G2 Powered DJ Speaker With EQ...

1 Answer

Subwoofer works - sound goes away after some time


Dec 16, 2008 | JBL EON 15-G2 Powered DJ Speaker With EQ...

1 Answer

Friend gave me a jbl surround system to go with my 52" sony hd tv. It has four speakers. three sat 20 and one bass 20. going to a rca stva 3970 receiver. didn't have instructions to go with it.

You need two more speakers to get surround sound,ie> two front one center and two for surround,then you need a home cinema amp to run the speakers and decode the sound from your tv,sky,dvd etc,and the sub gives you your bass.

Hope this helps.


Nov 16, 2008 | JBL 5.1-Channel Home Theater Speaker...

1 Answer

Sub freaking out! :-(

exactly......I bought a Klipsh

Nov 20, 2006 | JBL PB12 Subwoofer

Not finding what you are looking for?
JBL S312 Main / Stereo Speaker Logo

1,176 people viewed this question

Ask a Question

Usually answered in minutes!

Top JBL Audio Players & Recorders Experts

Michael Edwards
Michael Edwards

Level 1 Expert

53 Answers


Level 3 Expert

4751 Answers

Jerry Greenberg
Jerry Greenberg

Level 3 Expert

1646 Answers

Are you a JBL Audio Player and Recorder Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides