POS Midrange, but why?
10-18-00 | 12:02 PM
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I am using a pair of JBL Studio Seris S-310's in my HT setup and noticed something odd a few weeks ago. I took off the grilles to the speakers while I was rocking out to Kid Rock to see how much the woofers were moving. That's when I noticed an inconsistancy.
The woofers were fine, but the midranges on the speakers were performing differently. One midrange was barely moving and the other was moving a good deal more. I could hear sound coming from both, and neither sounded like they were crackling or anything. I figured the midrange that wasn't moving was the defective one so I sent it to the repair shop.
I recieved a call a few days later from the repairman at the shop and he said he couldn't find anything wrong with the midrange. He said the midrange isn't supposed to move, but he would replace it anyway since it was under warranty.
When I finally got the speaker back I tried rocking out to Kid Rock again to see if I could notice a difference. The funny thing was that the midrange on the repaired speaker still didn't move.
What is going on here? Is the midrange supposed to move or isn't it? The repaired one moves so slightly you can barely tell it's moving while the other speaker's midrange is moving so much that it resembles the movement of a woofer. Is my other speaker really the one with the busted midrange? How can I tell? Maybe some other owners of the JBL Studio Seris S38, S310, S312, or S412 can see how their midranges move when played at high levels. Any help would be greatly appreciated.
The woofers were fine, but the midranges on the speakers were performing differently. One midrange was barely moving and the other was moving a good deal more. I could hear sound coming from both, and neither sounded like they were crackling or anything. I figured the midrange that wasn't moving was the defective one so I sent it to the repair shop.
I recieved a call a few days later from the repairman at the shop and he said he couldn't find anything wrong with the midrange. He said the midrange isn't supposed to move, but he would replace it anyway since it was under warranty.
When I finally got the speaker back I tried rocking out to Kid Rock again to see if I could notice a difference. The funny thing was that the midrange on the repaired speaker still didn't move.
What is going on here? Is the midrange supposed to move or isn't it? The repaired one moves so slightly you can barely tell it's moving while the other speaker's midrange is moving so much that it resembles the movement of a woofer. Is my other speaker really the one with the busted midrange? How can I tell? Maybe some other owners of the JBL Studio Seris S38, S310, S312, or S412 can see how their midranges move when played at high levels. Any help would be greatly appreciated.
10-18-00 | 01:40 PM
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I'm not sure of the driver's in your speaker, but you may have a defective crossover in the speaker with the "moving" midrange i.e. it's not filtering the bass from the midrange.
If you have a tweeter, midrange, and woofer then the woofer should be moving significantly. In this case, the crossover would send the bass to the woofer causing it to move more then the midrange. The midrange should not be reproducing bass and thus should not move as much. Of course, this all depends on the crossover frequency used, I've seen 3 way speakers with a midrange that moved significantly.
Judging from the comment by the repairman, you may need to send in the speaker with the moving midrange to check for a defective crossover.
If you have a tweeter, midrange, and woofer then the woofer should be moving significantly. In this case, the crossover would send the bass to the woofer causing it to move more then the midrange. The midrange should not be reproducing bass and thus should not move as much. Of course, this all depends on the crossover frequency used, I've seen 3 way speakers with a midrange that moved significantly.
Judging from the comment by the repairman, you may need to send in the speaker with the moving midrange to check for a defective crossover.
10-18-00 | 05:15 PM
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trying switching the speakers from left channel to right channel and vice verse, play the same music and see if the mid range movement is the same.
Otehrwise I agree with sending the moving one to the repair shop.
Otehrwise I agree with sending the moving one to the repair shop.
