Zu Soul Superfly

that sounds like an incredible combo, gopher, congrats!

My 60 days with the Superfly will be up on the 18th of March. Been interesting so far. They're on the back of Naim pre/power and the break in had been slow but steady up until last week. Prior to that they were powerful; lacking a little detail at the very top end; lovely at low volume and the vocals were what I can best describe as distant. They sat very much behind the sound stage and were a little cuppy. Doubtless some of this was because my dealer plonked 'em down; spiked them up and advised to leave well alone to burn in before attempting to position them.

Early decision was that they were keepers without a shadow of a doubt.

Last Sunday/Monday vocals began to come very much on song and detail began to ooze through in large quantities. Then, the decorator arrived!!!

Fairly confident he's not destroyed anything but fair to say that bass power has all but disappeared. This is being attributed to a signIficant drop in temperature. Had some bass back Friday but lacking again today. Have been lacking some upper mids all the way through, possibly as the spikes were set quite high.

So, thought this was the moment to lower the spikes to see if I could re-ignite the burn-in and the bass and maybe up the upper mids. Unfortunately, if I lower the spikes as recommended by Zu there ain't enough thread for the nuts so I've left them be. However, after 5 days I'm beginning to want some actual bass back. Decorator had done by Wednesday so temperature has been normal again since Thursday. Can't believe how much bass I've lost. Unlistenable on occasions. Shrill and horrid.

Anyone else had similar with Zu burn in? I mean it's a quite dramatic loss. There is bass there but it's like a large radio on occasions.

Well, I've had mine for approx. 6 weeks. Plenty of bass. No issues like you mention. Wonder if something happened to the Grewe loading?
Would definately call Zu to discuss.
Sorry couldn't be more help

Can you elaborate about:

".....Then the decorator arrived...." ?

Phil

I had dramatic burn-in for weeks and weeks and I thought too for a few days that I had lost my mind! How many hours do you have on them? I would recommend 400 solid hours as a minimum. I would also comment that the positioning is critical for bass especially as well as amplifier matching. I do not know Naim at all other than knowing they have a great reputation, but it is SS correct? The Superflys are designed with tube amplification in mind, unless I am mistaken as sometimes happens.

The Superflys I auditioned where not picky with positioning, the sound stage was out in front, engaging, and for lack of a better term, Intimate. They were paired with a Quad tube amp using KT-66 tubes.