Hal Mahan wrote on Tue, 06 March 2007 19:36 |
I will repectfully disagree with you, as well. There are 8 models with the MTL prefix, 4 of which refer to the MTL2, & all show pin 1 & 2 positive to positive on the woofer.
I gotta wonder what the MTL2BT sounded like, never had the chance to experience one for myself,,,,,
Hal
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hello Hal,
i am going to respectfully challenge you.
if you notice i posted after the pdf was given by Phil.
information that i could have directed him to also.
obviously, i still answered for a very valid reason:one that has caught many sound-guys. being, the correct wiring for these boxes. (some of yorkville systems has the same issues as well you have to use the entire system and the procesor or its going to be out of phase)
the wiring is correct on the pdf file,but only for the "MT SYSTEM" if the gentleman is using MTL2s along with other subs,top boxes and processor other than what comprise the "MT SYSTEM" it would be incorrect to wire the boxes how the factory indicated on the pdf file i have to admit, that i was a little presumptuous when i gave my answer to the "MTL mystery wiring."
no one ever uses the entire mtl system, subs,top cabs and processors.
i should have asked him a few questions first. i assumned he did not have the entire system and had MTL2 boxes that he wanted to use with other tops and processor.(like most people are doing recently)
i gave him the wiring that would make his subs compatible with all other cabinets, positive voltage applied to positive speaker terminal results in speaker moving out or away from the box:
as quoted by mac "Since it is 2 identically mounted drivers, they need to operate identically. A positive voltage on the +pin of each pair in the NL4 should make the speaker cone move out from the box.
Mac the only problem with that, the MTL has the drivers reverse-mounted in a bandpass manifold, so the woofers move into the box.in other words the phase will be reversed.
in order for his boxes to be compatible with the existing convention of wiring for sub-woofers in terms of phase,he would have to wire his boxes exactly like i said. if he wants them to be compatible to the "MT SYSTEM" or other existing MTL boxes used with the MTH tops and processor, then he would wire it exactly like the pdf file says.
you mention the MTL2BT, they sound similar to the MTL2B but better than the MTL2A.
to shed some light on all what i just said about the wiring, i am going to use the speaker you mentioned as an example: find the pdf file and check the wiring:
its going to be exactly opposite to what the MTL2A/B is! which is essential how i told the gentleman to wire his boxes.the reason why its opposite, because EV had to bring it back in phase with the other "MT LINE", which have their magnets out. this MTL2BT as you will see from the pdf file has its magnet in the box like a conventionally mounted speaker. thats why its wired the way it is "OUT of phase".("IN" if referenced to other "MT SYSTEMS"
i hope this explanation shed some light on the misconception of wiring an ELECTROVOICE MT SYSTEM SUBWOOFER.
if I'm wrong, then i have been wrong for years and only doing what worked for me, sounded good to me and got the job done.
sheldon.
"i am hoping that we we all strive to give credible information around here: i would never knowingly tell someone to:"wire a jbl driver black as negative knowing that the positive voltage on the black produces a positive pressure. i would have to give all the facts. sometimes its not all about knowing, but knowing the reason why"
sheldon.