Monitor 7 Mids, One Extends more than the other?

[spasticpitbull]

Seems like one mid extends more than the other, They have been on my HK AVR 20, My Onk 701 and fasters 2chnl rig all balanced out.....Any thoughts? Input? Anything?

Pauly

Edit,..seems like one drives more even though seems pretty even in sound???

[scottnbnj]

are you talking about what you hear from the listening position or some other position?

and when you say 'extends' are you talking about has a wider dynamic or tonal range? or image extends further outside or to front and back of the speak? or the driver looks like it physically travels further in and out while playing?

for trouble shooting, you might try to listen in mono, switch l/r wires to r/l speaks, physically switch r/l speak to r/l positions and change wires l/r to r/l.

)

[spasticpitbull]

Driver physically extends more than the other....

[faster100]

when you put the power to those 7's that one mid range pumps like its fixing to have a heart attack... seems like a worn out driver, but i know nothing about those drivers or any others for that matter, I know it doesnt look right. Hope someone can chime in and help.

[RuSsMaN]

Sounds like either the cab isn't sealed as it should be, or the spider on the driver itself has lost it's rigidity (is that a word?).

I'd hope for the earlier, but more than likely it's the latter. If that thing is really moving, the voice coil is probably leaving the magnetic gap, which will lead to excessive heat on the coil, and eventually it will be toast.

Cheers,
Russ

[gidrah]

Make sure it's in phase.

[spasticpitbull]

OK on one Mid it says "Polk" and the other "RR 602" is this a replacement? The RR one. This is the one that "extends" more.

Let me know

Pauly

[scottnbnj]

that would drive me nuts. even if i had to struggle to hear the difference, i would still constantly struggle to hear the difference.

the same thing happened to my monitor 7b's (well, i did it to myself). it ultimatly led to lsi9's.

got a replacement driver off of ebay, it was physically different, i figured i could go buy a new matched pair of drivers or cut my losses and buy new speaks.

)

[spasticpitbull]

u cant really tell the diff other than looking at the driver itself

[mhardy6647]

If I understand correctly, one of the drivers is 'fluttering' (excessive cone movement). In the old days, this was often 'rumble' (very low frequency noise) from a turntable or record, or some very low frequency vibration (e.g., footsteps) being picked up by a phono cartridge, transduced to the amp, and duly amplified and reproduced. Of course, most folks here may not even know what a 'record' or 'turntable' is :-)

So... assuming that no turntable is present, here's another suggestion... there could be some low frequency (or even sporadic DC pulses) being generated by the amplifer itself. This is easy to test. Swap the 'bad' speaker and the good one in your system. See if the flutter follows the speaker or the amp channel. If it is the latter, you've got eletronics trouble brewing. Modern amps have all sorts of protection circuitry to protect your speakers from DC if the outputs short out, but nothing's perfect and IF it's the amp you'll want to repair or replace it before it takes the speakers with it when it goes south.

Just a possibility...

[spasticpitbull]

This is why i said these speakers since i have owned them have been on 3 seperate amps and still the same...I pulled out the driver last night and it is a 6502, I however did notice that some of the screws were not completely tight and there could have been an air leak but did not retest after i re-tightend as i took out one of the tweets to put in my new pair of M 10's, will retest when i get the a new tweet from madmax and see if it was indeed not "air" tight. If not then maybe its on its last limb, though sounds fine to me.

[mhardy6647]

oops... sorry. Thought I read your post carefully, but obviously not.