JBL 10 inch sub behaves funny

Bass&Trouble · 25th December 2006, 12:21

Quote:

Originally Posted by amit_sound

hey!! even i am facing a similar problem.. I got 2 15" GT4-15. Dunno why one of the subs stopped working.

I hope that it a connection problem....

Though help me out with this.....i am playing the two woofers with one GT0-601.1 mono amp. One woofer is working fine but the other one is stopped. Could this problem anyway related to the amp?

I mean can such a problem arize in a mono amp where one of the one sub is playing and other one not...

Well, anyways tomorrow i am going to my installer to check out the problem... I seriously hope that the amp dosent have any problem. Its 20k yaar.

The amp is certainly alright. Your subs must be connected in parallel to the amp, which is the reason why one is working and the other isn't.

Just to add, since the topic has come up. When using two DVC subs on one mono amp, and when it becaomes necessary to both serial and parallel voice coils to arrive at the amp's optimimum output impedance, it will help if each sub's coils are serialled and then both subs are connected in parallel onto the amp. This way, if one sub has a problem, you can identify it easily. If the coils of each sub are paralleled and then both subs are serialled at the amp, even if one of the four coils fail, both subs would stop working.

navin · 26th December 2006, 16:28

Quote:

Originally Posted by Bass&Trouble

When using two DVC subs on one mono amp, and when it becaomes necessary to both serial and parallel voice coils to arrive at the amp's optimimum output impedance, it will help if each sub's coils are serialled and then both subs are connected in parallel onto the amp. This way, if one sub has a problem, you can identify it easily. If the coils of each sub are paralleled and then both subs are serialled at the amp, even if one of the four coils fail, both subs would stop working.

option 1.
2 DVC subs. coil 1 and 2 from sub A and coil 3 and 4 from sub B.
coil 1 and 3 in series
coil 2 and 4 in series
both series combos in parallel.
coil 1 fails (open ckt). coil 2 and 4 keep both subs working. effective impedance is coil 2 + coil 4. if each coil is 4 ohms effective imp. is 8 ohms.

option 2.
2 DVC subs. coil 1 and 2 from sub A and coil 3 and 4 from sub B.
coil 1 and 2 in parallel
coil 3 and 4 in parallel
both parallel combos in series

coil 1 fails (open circuit) coil 2 will continue to conduct. effective impedance is coil 2 + coil 3 & 4 in parallel. if each coil is 4 ohms effective impedance is 6 ohms. unless coil 1 short circuits (rare) I dont see a problem with option 2.

amit_sound · 26th December 2006, 16:50

Quote:

Originally Posted by Bass&Trouble

The amp is certainly alright. Your subs must be connected in parallel to the amp, which is the reason why one is working and the other isn't.

Just to add, since the topic has come up. When using two DVC subs on one mono amp, and when it becaomes necessary to both serial and parallel voice coils to arrive at the amp's optimimum output impedance, it will help if each sub's coils are serialled and then both subs are connected in parallel onto the amp. This way, if one sub has a problem, you can identify it easily. If the coils of each sub are paralleled and then both subs are serialled at the amp, even if one of the four coils fail, both subs would stop working.

Quote:

Originally Posted by navin

option 1.
2 DVC subs. coil 1 and 2 from sub A and coil 3 and 4 from sub B.
coil 1 and 3 in series
coil 2 and 4 in series
both series combos in parallel.
coil 1 fails (open ckt). coil 2 and 4 keep both subs working. effective impedance is coil 2 + coil 4. if each coil is 4 ohms effective imp. is 8 ohms.

option 2.
2 DVC subs. coil 1 and 2 from sub A and coil 3 and 4 from sub B.
coil 1 and 2 in parallel
coil 3 and 4 in parallel
both parallel combos in series

coil 1 fails (open circuit) coil 2 will continue to conduct. effective impedance is coil 2 + coil 3 & 4 in parallel. if each coil is 4 ohms effective impedance is 6 ohms. unless coil 1 short circuits (rare) I dont see a problem with option 2.

hehehehe....he....he

jus another loose amp/sub connection. Got it fixed today..hehe...

Anyways thanx for taking the pains and helping us understand the connections better

amit_sound · 26th December 2006, 16:53

But still i feel the discussion was worth it!!! Cheers to u guys.......You see i am so happy after i came to know that there was no such major problem with my ICE..

greatmana2000 · 7th January 2007, 18:05

Hey ,guys thank you for your valuable comments . I had been out of station ,so was not able to reply . Will post as to wats the problem after checking the sub once again .

greatmana2000 · 10th January 2007, 11:33

Hi guys ,

Sorry for not being able to post my replies earlier . I was outof station and added to my woes are .my network admin has blocked Team-BHp at office .Reason - too many hits ..lol

Well, The installer is reputable in chennai and anyone would know Metal effect . The guy is been in the business for a long time . I also suspect the tinsel leads and I think there might be a breakage somewhere down the line .

I had changed the enclosure to check if the subs needed mucgh more volume . I used a enclosed box and then I used a larger enclosure .
Enclosue sizes were calculated using the specs on JBL site and some enclosue design software .

I had bought the sub for 4,500 and the dealer told me that the sub was with bill and warranty .

The guy had been a real nice friend to me and I do not collect the bills or anything ,I just go there fix and pay up . but ,I was disappointed when the guy sold me a pair of pio tweeters which were fakes and after that I stopped going there . I have also recommended the dealer to a couple of guys here on TEam_BHP.

Now ,I am stuck and I also had rumours that there are JBL fakes in the market . Could someone help me out on this ?

I will try calling shridar and then update you guys with the outcome .

Many thanks for trying to help me out .

navin · 10th January 2007, 11:47

You mean to say you got fake JBL woofers? Ouch! No bill? More Ouch.

esteem_lover · 10th January 2007, 11:59

Now, you are really in a fix. i have also been guilty of the same in the past, just trusting the guy & not taking a bill. You better stress on him to give a replacement. Maybe Sam can help you or maybe not. Good luck

desmoquattro · 10th January 2007, 14:39

Quote:

Originally Posted by greatmana2000

Hi guys ,

Sorry for not being able to post my replies earlier . I was outof station and added to my woes are .my network admin has blocked Team-BHp at office .Reason - too many hits ..lol

To solve your problem, there is www.stupidcensorship.com

26th December 2006, 16:53	#19
amit_sound BHPian Join Date: Dec 2005 Location: Mumbai Posts: 596 Thanked: 11 Times	But still i feel the discussion was worth it!!! Cheers to u guys.......You see i am so happy after i came to know that there was no such major problem with my ICE..
	() Thanks

7th January 2007, 18:05	#20
greatmana2000 BANNED Join Date: Apr 2006 Location: chennai Posts: 703 Thanked: 58 Times	Hey ,guys thank you for your valuable comments . I had been out of station ,so was not able to reply . Will post as to wats the problem after checking the sub once again .
	() Thanks

10th January 2007, 11:33	#21
greatmana2000 BANNED Join Date: Apr 2006 Location: chennai Posts: 703 Thanked: 58 Times	Hi guys , Sorry for not being able to post my replies earlier . I was outof station and added to my woes are .my network admin has blocked Team-BHp at office .Reason - too many hits ..lol Well, The installer is reputable in chennai and anyone would know Metal effect . The guy is been in the business for a long time . I also suspect the tinsel leads and I think there might be a breakage somewhere down the line . I had changed the enclosure to check if the subs needed mucgh more volume . I used a enclosed box and then I used a larger enclosure . Enclosue sizes were calculated using the specs on JBL site and some enclosue design software . I had bought the sub for 4,500 and the dealer told me that the sub was with bill and warranty . The guy had been a real nice friend to me and I do not collect the bills or anything ,I just go there fix and pay up . but ,I was disappointed when the guy sold me a pair of pio tweeters which were fakes and after that I stopped going there . I have also recommended the dealer to a couple of guys here on TEam_BHP. Now ,I am stuck and I also had rumours that there are JBL fakes in the market . Could someone help me out on this ? I will try calling shridar and then update you guys with the outcome . Many thanks for trying to help me out .
	() Thanks

10th January 2007, 11:47	#22
navin Team-BHP Support Join Date: Mar 2004 Location: Mumbai Posts: 25,198 Thanked: 9,304 Times	You mean to say you got fake JBL woofers? Ouch! No bill? More Ouch.
	() Thanks

10th January 2007, 11:59	#23
esteem_lover Senior - BHPian Join Date: Jul 2006 Location: Madras/Py Posts: 7,556 Thanked: 502 Times View My Garage	Now, you are really in a fix. i have also been guilty of the same in the past, just trusting the guy & not taking a bill. You better stress on him to give a replacement. Maybe Sam can help you or maybe not. Good luck
	() Thanks