got my x-overs back from WMD

leftwinger57

Hey guys I just in my x-overs to my M7s back from Dave. They look fantastic and workmanship is excellent w/ the packing as well. Since my 7s are from 1978 and 9 years older than my 2Bs I decided to do the full monty on them w/ Sonicaps and Daytons and resistors, with adding new 5 way binding posts. I sent Dave male ends for quick disconnects as I did the female leads at home and the leads from the speakers themselves are soldered. They are already on and sound great. About burn in time, Dave said most believe 200hrs is the nominal time and some will hear a difference and someone like me most likely will not. Also he said I could run them at low volume for 8 days or just run them as usual and put in the hours. I told him there was no rush because of my other working sets but 2 weeks later they are back and working.
In the interim I called Polk c/s and asked what series these were and maybe not the very 1st run but for sure an early model 7A . I also asked if they had an archive on line of serial numbers like Fender has for their guitars and amplifiers. They said not on line but at c/s they do have the archive and could look them up to see born on date and possibly even the vendor they were sold to. Dave in no way solicited work through the forum I got him through his own site.


http://www.guitarhq.com/fender2.html#tele

voltz

Looking Good Lew! Enjoy them!

I put my 10's & CRS's in my pc room and gave them 12 hours a day for several weeks and the really opened up & with time they only get better!

Excellent work as always Dave

westmassguy

Was my pleasure Lew. Enjoy!

leftwinger57

If you noticed I had Ken move my post from electronics to vintage speakers which '78 M-7s are. Skip I'm sure you know how to rebuild or build stuff but Dave besides his workmanship is a veritable fountain of freaking knowledge. I bother him all the time about Bose 901s and their quirkyness and how he rebuilds the EQs and all sorts of other stuff. I also would like to meet all you dudes, after years here it's kinda like a fraternity for gear heads.

westmassguy

Not a bother Lew.

boston1450

Those look great Lew. David does very nice work. He goes above n beyond when he does. Yup packs like a pro. Enjoy breaking those in & please keep us updated on what you think

leftwinger57

Hey Randy thanks, already these sound awesome w/ the bass throw that was not there before and a balance of tone that it seems if I go past 8:30 position on my Dynaco pre, things get very loud w/o distortion and the Peerless tweeters just smooth out all the highs.
I might have an issue on my hands, these 7s are so efficient that believe it or not is very close to being a competitor to my 2Bs. Truth be told when Trey did the x-overs on my 2Bs I just could not afford the top tier of parts at the time a couple of years ago. They are not Sonicaps but all black and I have no picture to show what make they are. So the question is are the Sonicaps and Dayton combo well pardon the pun, sonically better, or is it a longevity thing than what I have in my '87 2Bs ? There is no turning back now 2Bs are staying as they are I was just wondering and maybe these are so new to me I'm just hearing things...

Moose68Bash

Happy listening, leftwinger57. It's amazing what new electronic components can do to improve vintage Polks.

Well done, westmassguy!

westmassguy

boston1450 wrote: »

Those look great Lew. David does very nice work. He goes above n beyond when he does. Yup packs like a pro. Enjoy breaking those in & please keep us updated on what you think

Thanks Brother

westmassguy

Moose68Bash wrote: »

Happy listening, leftwinger57. It's amazing what new electronic components can do to improve vintage Polks.

Well done, westmassguy!

Thank you sir

westmassguy

leftwinger57 wrote: »

Hey Randy thanks, already these sound awesome w/ the bass throw that was not there before and a balance of tone that it seems if I go past 8:30 position on my Dynaco pre, things get very loud w/o distortion and the Peerless tweeters just smooth out all the highs.
I might have an issue on my hands, these 7s are so efficient that believe it or not is very close to being a competitor to my 2Bs. Truth be told when Trey did the x-overs on my 2Bs I just could not afford the top tier of parts at the time a couple of years ago. They are not Sonicaps but all black and I have no picture to show what make they are. So the question is are the Sonicaps and Dayton combo well pardon the pun, sonically better, or is it a longevity thing than what I have in my '87 2Bs ? There is no turning back now 2Bs are staying as they are I was just wondering and maybe these are so new to me I'm just hearing things...

Lew, you probably have Solens or Dayton/Bennics. They both have a black casing. It's always best practice to use the same caps in the Hi & Lo-pass. Using a lesser cap in the lo-pass is an acceptable trade off. You want the best cap for the tweeter, because its in series with it, so all the signal passes through it. In the lo-pass, the cap is in the shunt position, and is in parallel with the woofer. They still interact, but is less of a problem.