Fidelity Research FR64x

[Mike]

Mine is just about due for a retip... but what it needs more than anything is a decent tonearm! Actually, it could do with ANY tonearm TBH, having recently sold mine.

Hmmm, getting more and more tempted!

[Rare Bird]

Do it mike you know you want to

[nat8808]

Johnny (J7 - of Audio Origami fame) just complemented the arm too on the TheCrossoverNetwork forum so must be good!

The FR64fx's effective mass is 20g so here's the chart for cart compatability:

Vinyl Engine Resonance Evaluator

The ART1 has a mass of 9.5g and compliance at 100Hz of 8 which could be about 9 at 10Hz (that's a guess) for the chart.

That puts combined resonance nicely at 10Hz (SME state 10-12 Hz to be the desired range) so that it doesn't effect the bass nor get the whole cart wobbling about due to warps and causing horrible flutter or a bouncy suspended deck!

[Barry]

Johnny (J7 - of Audio Origami fame) just complemented the arm too on the TheCrossoverNetwork forum so must be good!

The FR64fx's effective mass is 20g so here's the chart for cart compatability:

Vinyl Engine Resonance Evaluator

The ART1 has a mass of 9.5g and compliance at 100Hz of 8 which could be about 9 at 10Hz (that's a guess) for the chart.

That puts combined resonance nicely at 10Hz (SME state 10-12 Hz to be the desired range) so that it doesn't effect the bass nor get the whole cart wobbling about due to warps and causing horrible flutter or a bouncy suspended deck!

No, not quite: the compliance of a cartridge at 10Hz is 1.5 - 2 x the compliance at 100Hz. So for the ART1 this puts it at 12 -16 cu, placing the resonance when installed in FR64fx arm at between 7.3 -8.3Hz.

Theoretically this is a little too low, but if the deck is well isolated from the floor (and thus not subject to footfalls) it shouldn't be a problem.

[nat8808]

I see - thanks for that.

I had it on an Oracle, an Acoustic Arts stand (odd design, but very good) and have a concrete floor so it worked very well.

It was originally matched with a Koetsu Red so that may be an even better partner for the FR64fx

[nat8808]

Bump

(P.S. Marco - the FR64fx manual says that with there is an optional weight to use with the SPU and before I knew that, I remember seeing one on one Ebay site or another relatively recently which I doubt will have sold.. Could be worth doing a little research)

[English Audiophile]

That looks familier, I think I still have one of those packed away still in it's original box!

[nat8808]

That looks familier, I think I still have one of those packed away still in it's original box!

You need to find that and dust it off!

Unexpectedly, the FR64x is still for sale..

[nat8808]

SOLD!