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Author Topic: Refurbishing Altec Voice of the Theater Speakers? Victor Liorentas Jedi Master Film Handler Posts: 800 From: london ontario canada Registered: May 2009 posted 04-05-2011 09:55 PM                     Thanks guys! I used a scv phase checker connected to each amp one at a time which sends a click sound to the speaker and the other piece has a microphone.Placing it directly in front of each driver a green light comes on when in phase and a red when out. So every driver on every speaker(all 2 way passive) gave a green light. I then put the horn out of phase and the red light came on. The reason i used this scv phase checker was to be certain of phase despite the wiring. My question put another way is from the factory would you get a green light or a red light?  |  IP: Logged Victor Liorentas Jedi Master Film Handler Posts: 800 From: london ontario canada Registered: May 2009 posted 04-07-2011 12:08 PM                     So i put the horn on my center speaker back in phase but under my flashlight i could not see positive and negative but i do know that L1 is connected to the left side of horn if your facing the projector.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 04-07-2011 02:03 PM                     Altec did not use Blk/RED or pos/neg...they used L1/L2. Remember, whomever installed the diaphragm needs to have been installed properly such that L1 is connected to L1  |  IP: Logged Victor Liorentas Jedi Master Film Handler Posts: 800 From: london ontario canada Registered: May 2009 posted 04-07-2011 02:21 PM                     I installed the diaphragm months ago (correctly i hope)but since switching to a cp 55 from a Smart mod 8 i have this nagging thought that maybe i got something wrong. It sounds very good but on some older mono films like Jaws i wonder if it could be a tick clearer in the highs. Is it possible the mono eq on the cp 55 needs adjusting assuming the Altec Lansing speaker is correct and is there much to tweaking the mono eq without a RTA? I don't know for sure if the mono eq was optimized or not.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 04-08-2011 09:49 AM                     The diaphragm, if the older style, will have an "L1" rubber stamped on the side of the support. If it is more modern, it will have a sticker...a nuance that may be missed by some.  |  IP: Logged Victor Liorentas Jedi Master Film Handler Posts: 800 From: london ontario canada Registered: May 2009 posted 04-08-2011 01:00 PM                     OK thanks Steve and Louis! I am now certain i installed it correctly and phase checking was not needed but it was fun! I think the issues I am having are due to the cp55 mono eq as every other format sounds great and mono + digital were the only formats sounding good when the Smart Mod8 was drunk at the wheel  |  IP: Logged

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