JBL ES250 400 watt RMS 12" subwoofer, any good?

Subs are simple devices really, there's not much to go wrong and if it does its usually a case of replacing the damaged part rather than fixing anything. 30 min job for them really unless the actual cabinet is damaged. You'll be in bass heaven soon, hold tight ;)
 
update

Hello Gareth


Your subwoofer is on the test bench, the engineer tests the subwoofer with a signal generator so that he can sweep the entire subwoofers frequency band and pin point any frequency that is causing a problem. The engineer cannot replicate the farting noise, so the subwoofer will be left on soak test today. If we cannot find any problems we will fit a new loudspeaker and amplifier and return the subwoofer to you.
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now i'm confused. first thing,, what is soak test?, second why are they continuing testing it if they are going to fit a new loudspeaker and amplifier anyway?

:confused:
 
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gareth170 said:
update



now i'm confused. first thing,, what is soak test?, second why are they continuing testing it if they are going to fit a new loudspeaker and amplifier anyway?

:confused:
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Soak testing involves testing a system with a significant load extended over a significant period of time, to discover how the system behaves under sustained use.

For example, in software testing, a system may behave exactly as expected when tested for one hour. However, when it is tested for three hours, problems such as memory leaks cause the system to fail or behave randomly.

Soak tests are used primarily to check the reaction of a subject under test under a possible simulated environment for a given duration and for a given threshold. Observations made during the soak test are used to improve the characteristics of the subject under test further.

In electronics, soak testing may involve testing a system up to or above its maximum ratings for a long period of time. Some companies may soak test a product for a period of many months, while also applying external stresses such as elevated temperatures.

This falls under stress testing.
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I am guessing because they want to find the cause of the issue. If they find it they might be able to alter the production for future models so it doesn't happen again.

They will be replacing it anyway to keep the customer happy and if the soak test has damaged any kit they won't want to give it you back :)

That would be my thought process behind it.
 
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just called them today and guess what still testing. now im getting abit ***** off. last friday they said it'll only take 1 to 2 days. as it's going i won't see the sub till maybe monday.
 
gareth170 said:
just called them today and guess what still testing. now im getting abit ***** off. last friday they said it'll only take 1 to 2 days. as it's going i won't see the sub till maybe monday.
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Well it does sound like they can't find the problem, so yes they would still be testing, surely? What amp are you using?
 
Can't say I've heard of them. I'm just wondering if its something on the amp causing issues with the signal the sub is receiving, rather than the sub having something wrong with it.
 
Jano said:
Can't say I've heard of them. I'm just wondering if its something on the amp causing issues with the signal the sub is receiving, rather than the sub having something wrong with it.
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i don't think so. because i have being using my old sub on it without issues..

anyway they are sending it back to me.
 
Lowe said:
How you getting on?
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i got it back and they said they've fited a new loudspeaker and amplifier but im not sure if thats true because the controls was set to max. anyway it still makes that noise on certain songs..

The settings i'm using is the low-level input, gain on forth notch, filter to out, phase on 0, Coverover frequency at 100hz (via pc).

also im not getting the same level of bass which i had before with my old sub. if i turn up the sub volume to about 60-70% via pc than i get the same level of bass which i had before but i start to hear that noise on certain songs e.g Jordin Sparks - Battlefield and Nero - Guilt..

on 60hz it doesn't make that noise much.

bk said the sub can handle the coverover frequency at 100hz fine.

im going to try moving the sub. it could be something in my room that making the noise when i turn up the volume.

i'd admit the bass goes very deep.
 
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about 5 days ago my sub has been making popping sounds and weird sounds in some songs.

even tried bypassing the 5.1 amp by just connecting the sub output from the pc to the sub, but it still happens..

I've showed BK the video and they are saying it's faulty. so it's going back again.
 
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Sounds like a lose connector. Recording on the phone is not ideal either. White noise and more white noise. Sorry to see you've had such trouble with the amp. At least you will have the comfort of knowing that once you have a fully functioning amp it will be so much better than the JBL. Furthermore, if they can't fix it they may even offer you a different model. Small companies tend to be much more concerned with customer satisfaction so perhaps you shouldn't keep second guessing and hold out for a satisfactory result. The fact you can even contact a manufacturer these days by any method is a blessing. Hello JBL? Ja. Nein. ok...
 
J0hnb0y said:
Sounds like a lose connector. Recording on the phone is not ideal either. White noise and more white noise. Sorry to see you've had such trouble with the amp. At least you will have the comfort of knowing that once you have a fully functioning amp it will be so much better than the JBL. Furthermore, if they can't fix it they may even offer you a different model. Small companies tend to be much more concerned with customer satisfaction so perhaps you shouldn't keep second guessing and hold out for a satisfactory result. The fact you can even contact a manufacturer these days by any method is a blessing. Hello JBL? Ja. Nein. ok...
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the guy thinks it's a amp component that's faulty..

he said they may just replace all the parts again (amp/speaker)

yes maybe theres alittle white noise but tbh the recording from the phone picked it up perfectly. what u hear in the video when the bass kicked in is exactly what it sounded like...
 
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Hello Gareth

We received the subwoofer at 4.00pm yesterday, the amplifier has been repaired and is on soak test now and we will return the subwoofer today to be with you on Monday

Regards

Tom
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I thought soak test means extreme test? surely they would need to replace the parts before returning it or not?
 
ok. :)

Hello Gareth

The amplifier has short circuit protection on it and the low voltage power supply has just enough voltage to turn the amplifier on, once there is a signal to the loudspeaker a feedback circuit takes some of the signal then rectifies it then feeds this back to the low voltage supply to support it, this keeps the amplifier working. If there is a short circuit on the amplifiers output this voltage cannot be fed back and the amplifier will not work. This part of the circuit had failed, so without the support from the signal the amplifier cannot work.

The loudspeaker is not damaged as the amplifier cannot work whilst the faulty existed, Its on the test bench and it sounds fine

Regards

Tom
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Hello Gareth
The short circuit part died, no short. The fault is nothing that you have done just a failed component . I would plug the mains the same way as you did before

Regards

Tom
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Blimey you've had a right rough ride haven't you? Up to this point I'd never seen a dodgy sub from BK, and plenty of my friends have had them - I've got two!

Least it's on the mend, fingers crossed this is the last of the issues for you. :)
 
I've had my Gemini II for 2 years now, bought to go with my Mordaunt Short Alumni as it was the same price as the matching MS sub, but of far better quality. Not a day has gone by that I regret my decision - you just appear to be unlucky.

Fingers X'd that's the last of your woes and you continue to enjoy the sub (even if you do appear to run it at seriously high levels!) :D
 
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