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Old 22nd February 2015, 01:07 PM   #1
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Default Noobie looking for help !

Hello folks,

I joined up a recently in the hope some one could help me with an issue iv got with a pair of JBL subs and/or possible system faults as some of it is 30years old ! the actual problem is that the subs themselves have got quite vocal and are not giving a deep sound like they use to. Here is a couple pics please disregard the tweeter,


Click the image to open in full size.

Click the image to open in full size.

As previously mentioned the subs are nearly 20 years old and i can remember making the enclosure as per the instructions that came with the subs, i can also recall making to the box and port dimensions to give a 40hz response, dose this sound correct ? I then needed a crossover and was advised to by what i think is some sort coil the i soldered inline on the positive side, iv attached a pic of it as its got a heat shrink around it.

Click the image to open in full size.

I would be very grateful if some could point me in the right drection as im struggling to even ask the right questions in order to get the passive or active cross over ( i don't mind which ) in order to get a deep sounding base again.

Finally my system comprises of :
1 Pioneer VSX 1122 AV amp
A pair of Technics class AA amps @ 100 watts rms into 4 ohms , these are connected via a 20 meter RCA from the Pioneer , one drives a pair of full range speakers. The signal is then split And the second drivers the subs .

Please be gentle with me folks. Thanks in advance for any help

Fruit
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Old 22nd February 2015, 04:11 PM   #2
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If you're getting to much mid range, the crossover is too high or not steep enough.. If you're using an AV amp you can use the sub output which will have a low pass filter on it.
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Old 22nd February 2015, 06:31 PM   #3
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Thank you for your reply,

My sub output on my av amp is being used as part of my 5.1 set up in the living room. I have a 20 meter RCA cable connected to the zone 2 part of the av amp that runs through to the garage. I think it's the crossovers that are the problem. I could with finding out how to test the crossover I have or, sort some more out but I'm not sure what to get. Any further help would be appreciated.

Many thanks

Fruit
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Old 22nd February 2015, 09:28 PM   #4
GM is offline GM  United States
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Greets!

According to this, the box should be 1.30 ft^3 net tuned to 30 Hz, a bit smaller than one would normally use for non mobile audio apps, so as you can see it only has a really prominent bass line if in a closed vehicle: http://www.jbl.com/resources/Brands/...ers/GT1000.pdf

Regardless, are you saying that this system hookup worked with deep bass and now it doesn't or...........?

WRT the crossover, what is it and its specs or at least all the info printed on it?

GM
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Old 22nd February 2015, 10:25 PM   #5
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Quote:
Originally Posted by Fruit View Post
Click the image to open in full size.
If this is the extent of your crossover then that is your problem, to get sub bass only from these drivers you need one of these between the amplifiers..
Rane AC22 Rackmount Active Crossover | eBay
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Old 23rd February 2015, 05:53 PM   #6
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Quote:
Originally Posted by GM View Post
Greets!

According to this, the box should be 1.30 ft^3 net tuned to 30 Hz, a bit smaller than one would normally use for non mobile audio apps, so as you can see it only has a really prominent bass line if in a closed vehicle: http://www.jbl.com/resources/Brands/...ers/GT1000.pdf

Regardless, are you saying that this system hookup worked with deep bass and now it doesn't or...........?

WRT the crossover, what is it and its specs or at least all the info printed on it?

GM
Hello,

Thanks for digging the specs up, I have notice the specs are saying a 3" port . For some reason I used a 4" one. That said I have always been happy with the bass they produced up and till recently when they have become quite vocal. I think tbh conanski sounds right to me, whilst I think there is also an issue with amp as both subs sound to vocal. The crossovers are rubbish and I just want to go through my system and check what I can. Anyway thanks again GM

Adder
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Old 23rd February 2015, 05:58 PM   #7
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Quote:
Originally Posted by conanski View Post
If this is the extent of your crossover then that is your problem, to get sub bass only from these drivers you need one of these between the amplifiers..
Rane AC22 Rackmount Active Crossover | eBay
Hello,

Cheers for the reply, is it possible to get hold of one of these crossovers with RCA connections or will I have to some sort adaptor lead made ie, RCA to Jack plug ?


Many thanks

Fruit
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Old 3rd March 2015, 11:41 PM   #8
bjorno is offline bjorno  Sweden
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Hi All,

FYI:

b
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Old 5th March 2015, 06:11 PM   #9
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Hello Bjorne,

Thanks for taking the time to post, I have the honest when I say Im not at sure what it means. I think I'm going to take conanski's advice and get hold of an active crossover and then my hope is that I can adjust the frequency to suit.

Many thanks

Fruit
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