19-Oct-2016, 10:59
(19-Oct-2016, 09:25)Hifi_swlon Wrote: Interesting.I checked the bolts on my ProAcs recently and found that they were not fully tightened. I got the right sized Allen key out and proceeded to tighten them, tightening one, then the one opposite and so on.
I mean they weren't loose so to speak, just not tight. I could turn the bolts with practically no force so just carefully finger tightenened them further. They're only a 2.5mm allen bolt so I'm guessing not designed for huge force.
No idea whether PMC don't tighten much, or they'd loosened over time with the previous owner (who said they had very few hours as a demo pair).
Either way they sound much more like the pair I demoed.
The question now is - how tight should they be?! I don't want to overtighten. For now they sound great so am leaving them. Have asked PMC but no reply so far.
I cranked them down as much as I could, bearing in mind that they were fairly small bolts into soft wood. I couldn't detect any change in the sound, but it's pretty obvious that if the driver can move, then your SQ will suffer.
Project Eperience X Pack with Ortofon Rondo Red MC, Oppo BDP 105D, 2 x Sonos Connect, QNAP HS251+ NAS with 2 X 6TB Western Digital Red, Mac 5K 32GB running Lifetime Roon, iPad Pro 12.9" for remote control. Etalon Ethernet Isolator, Devialet 440 Pro CI, Sonus faber Olympica ll with Isoacoustics Gaia ll feet, Auralic Taurus Mkll headphone amp., Denon AH-D5000, Sennheiser HD600 and HD800 with Cardas cable, Van Den Hul The First Ultimate and Crystal interconnects, Furutech power cables, GSP Audio Spatia speaker cable.
South Coast England
