Kef 107 vs 107/2

I presume that if you cross the 107s or 107/2s to a suitable sub below 80 Hz the KUBE is not needed; is that correct? I have a KUBE designed for use with 104/2s that I have never used, because I cross my 104/2s below 80 Hz to my Velodyne HGS-15. It seems logical to me that freeing the KEF drivers from very LF excursions can only enhance their airiness and transparency above the cross over. Although the 104/2s excellent full range speakers, the sub adds LF extension, noticeable especially with low pedal notes of pipe organs. The 104/2s seem to loose a bit of airiness when used full range with the sub, so I always cross at 80 Hz.

db

has anyone ever tried to upgrade the crossover on the 107. With the vast improvement in semi conductors .....there should be some audible differences......

i have the 107 and the 107/2... i would like to upgrade/ modify my 107 to become 107/2......Has anyone ever attempted?

I've had 107/2s since the early nineties (replaced my AR9s). I think the differences between the 107 & 107/2 is mostly attributable the KUBEs each use. I listened to both versions when I was shopping (the dealer had older ones still in stock), and I recall thinking the /2 was worth the price difference (around $500, IIRC). KEF claimed the only changes were a new tweeter, bi-amp ability, and the design of the KUBE... my suspicion then, as now, is that the KUBE makes the biggest difference. I listened to each, with, and without their KUBEs, and the older model sounded worse in the mids & highs, with the KUBE. The newer model sounded almost exactly the same with, or without it's KUBE... except for the improved base, of course. I wouldn't use my 107/2s without the KUBE, if I had an older model, I'd look for a newer KUBE!
Also, it should be mentioned that any 107s are going to need new woofer surrounds by now, even the last of them are certainly cracking. I just redid mine a few weeks ago, and I should have done it a couple of years ago! A properly working pair of 107s (with the KUBE) have AMAZING base that IMHO can't be beat for less than $10k.

responding to Kenwood700cmt:

recently I have upgraded the MF/HF xo to Solen caps, replacing the stock Alcaps and adding a bit of Cardas Quad Eutectic solder to all contacts: as expected, the sound stage widened and everything is clearer. Maybe I should replace the internal wiring with something better. I am sure replacing the caps in the LF xo will tighten up the bass but I am pretty happy with that already.

After so many years, I suspect that the fluid in the T33 / SP1210 tweeters have started to dry out (havent noticed the drop but it may happen so gradual that I didnt notice or I am just getting more deaf). I wonder if anyone has tried to upgrade the existing ones to ScanSpeak 9300 or 9500 (which have a very similar frequency plot as the T33) with satisfactory results. If anyone has new old stock of a pair of Vifa MG27 and want to sell them, please email me, thanks!

I recently inherited a pair of KEF Ref 107 II's and I think they sound amazing. I do not believe I have ever heard any speakers like them :-) However, I understand from this thread that I should probably do something with them to make them sound better (change woofer surrounds?). I do not know anything about this, but I would really like to learn and could use some advice on how to get started, where to buy spare parts, what to look for etc. Could you help me please?
BR,
Erik