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In Reply to: Re: run-in period for Harbeth HL Compact 7ES posted by TOOL on September 30, 2001 at 20:49:55:
Do it the standard way, but you would have to go without music for about 10 days:Face the Compact Sevens towards each other, almost touching.
Wire them out of phase, so their output cancels out. You will be surprised that very very little sound can be heard, even though you may be driving them really hard, so be very careful NOT to overdrive them!!!
Play back the XLO or Purist enhancer CD 24 hours non stop at a REASONABLY moderate level to run in the speakers. MUCH more effective than music, because they use continuous pink noise that work the driver and tweeter continuously. Music signals fluctuate in intensity, and thus do not drive the speakers as thoroughly. Burn in will take a lot longer to burn in.
DOn't use your high end SACD player for this as you will wear it out or damage it through constant playing. Use an old CD player.
Or if you are still using a high end CD player, go ahead and run it to the ground with this burn in process, which will give you an excuse to upgrade to an SACD player! :) Just joking of course. Better idea to sell the CD player (theses are still in demand) and channel the money to a new SACD player.
Again, drive the speakers at a moderately high volume, but DO NOT OVERDRIVE!
All the best! Is your Compact 7es the version 2 type?
Follow Ups:
Assumming you have a good supply of vinyl and you are not into re-issues?
Yup, I think most people for hardcore breakin do the out-of-phase thing with pink noise or pink noise interspersed with busy music (Prodigy "Firestarter" in my case). I turn it up more and more throughout the breakin process but always make sure the peaks are within the driver limits so I don't damage anything. After 200 hours or so if things are still a little stiff I use a tone generator to help, like a 15 hz tone for midrange/woofer (so you don't hear much but it does a great job of loosening stiff 6.5" drivers). ~24 hours a day (if it gets annoying, put speakers closer together facing each other and then put something on top like lathers of clothes to help muffle the sound leaking around the edges) x 2 weeks = 300+ hours.
thanks for the advice.wow. how do I know whether it's version 2 or not????
any indication? serial number? or what? learning something new again.
It will say 7 HL ES 2 on the front baffle, if its version II. No need to sweat it if not, as there is minimal difference.Anyway, the reason why you get so little sound when you wire them out of phase is that the Compact 7 pairs are matched so closely, you truly get an opposite image from each speaker that cancels the other very effectively, more so than other brands.
why would Harbeth want a version 2 for their 7ES? what is the difference? marketing ploy?anyway, I'm pretty satisfied with mine...I got a used pair anyway. the previous owners treated them well.
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