Last Tuesday I received a nice package in the mail. It seems I have received one of the first production SuperMacro 4's from my friend and amp builder Xin Feng. As one who has heard just about every version of Xin's amps since the very first ones; the ex-rocket scientist has cooked up his...

About a month ago, I got an email from Xin Feng about the OPA 637 opamp. He thought it may sound good in the XP-7 I have because it uses the same buffers as the ones he was experimenting with for the SuperMono and he found the combination especially good. A couple of days later, a package...

First, an email from yesterday Bob, Glad you just had a great vacation. Canoe, kayak... I have no idea what they are, but must be fun. You might have seen the words about the SuperMono. This one is what you've been longing for. I'm very excited about it too and just did the key design...

I did, and told him he wasn't getting it back. We had a good laugh about it, too! My old buddy George and I drove down to Davis CA this Saturday. He had business with his niece (as well as a Lexus) there so we decided to give Xin Feng a jingle as well for dinner. It was a good time as usual...

EY YAH! EY YAH! Is an expression which is a throw back to my youth growing up in da Bronx. My dad would take us out to Chinatown every Saturday morning in NYC to get supplies for the household for the next week. Chinatown in NYC was and probably still is full of groups of old Chinese...

AD 825 797 8610 8065 If you are just tuning in, these are the opamps I have been rolling into my XP-7. The XP-7 comes with Browndog adapters that allow for interchanging the opamps and thus make less than subtle changes in the overall sound of the amp. I now own pairs of all these...

Received another version of the SuperDual prototype from Xin yesterday. This one has basically the same appearance as the first prototype. The only external differences are minor. All the jacks and plugs are in the same place as the last proto unit. One nice addition is that the switches are...

This week was busy for me so I only had a chance to do a most basic opamp roll to the XP-7. Using the same ad825 and ad 797, I explored the differences between using one or the other in the left and right channels. Are there differences and how do you make a determination as to which one goes...

To make a short story shorter–loved the Bass on the stock AD825 but was not too crazy about the rest of it. Loved the rest of it on the optional AD797 but the 797 was weak on Bass. Put an AD825 into the right channel and a 797 into the left. Got the Bass mids, hf, air and transparency I wanted...

Well, I got my hands on a fourth generation prototype (and probably final) of the SuperDual today. It is built into a Serpac case with Xin's newest output buffer configuration. This particular case is a stock item from Serpac so all the holes and openings are drilled and made by Xin himself...

When you pull the power cord out of the wall or power conditioner, how long does your amp keep playing? My MPX3 plays with good fidelity for about 18 seconds with a fast degradation of the sound to nothing at 22 seconds.

Xin sent me one of his prototypes for the Super Micro Amp and it arrived today. Right out of the bag, it sounds broken in and it may be; as I have not talked to Xin about the history of this particular one. This amp exhibits none of the previous brand-new Super Mini characteristics. It is not...

Hello all: Plugged in the MPX3 Tuesdayl. I'm late for my appointment; but can't put Dead Can Dance (Into the Labyrinth) away. Amazingly beautiful, powerful and complex right out of the box. Too bright with Portishead though; but only 40hours on new tubes. Time to go for now for the...

http://www.imagestation.com/album/?i...ulation_page=Y Hi all: Please take the above link for pics, hope all works as this is the first time I've tried to show pictures. Been away from headphone stuff for awhile to get my Studio/Home theater tweaked out with a new projector, Sound Anchors...

Jeez! Today just for grins I decided to hook up my home front end (Cal Audio Delta Cd transport /Theta DSP pro DAC to Fixup's SuperMini v4 and a Tangent All Out Home META 42. A Straightwire RCA-mini from Headroom was the interconnect, Senn 580's and Ety 4's were the phones. My initial impression...

Hi All: I think the Fixup Mini which came about 2 1/2 weeks ago has finally broken-in! It sounds somewhat like the SuperMini after about 3 1/2 weeks of break-in. (SuperMini's finally stabilized after about 5 weeks which is the original version, before the feedback loop upgrade version. Fixup...