johnsonwu

Responses from johnsonwu

Review: JM Labs Diva Utopia Be Speaker
It's been exactly a year since I've owned the speakers.A fellow audiogoner bravely took the step of following my crossover mods and is quite pleased with the results.Recent communications with him sparked my interest in further pursuing the improv... 
Who prefers the Quad 57s over the 63s?
Has anyone done a side by side comparison of a stock 57 vs a 63 with the input cap/resistor circuit bypassed? That will make a 63 smoke like a 57 when overdriven for sure, but is the 63s lack of magic simply due to that lossy C/R combo? 
The Physics of Electricity
Some attribute it to skin effect, some say its conductivity of the material (therefore the ned for 7N copper or silver), some say it's the way the strands and the dielectric minimizes capacitance and shield RF.I once entered into a discussion on t... 
Canary Ca339 driving Martin Logan Vantage
Looks like in another post you said you have Canary CA160 driving Martin Logans....hmmmmm... 
Canary Ca339 driving Martin Logan Vantage
They will not drive Martin logans. They will clip very early and will distort very annoyingly. Been there done that. CA309 on SL3s, and CA301 with Aerius I. 
Review: Tube Research Labs Dude Tube preamp
No offense to Paul in fact I respect him a lot but the only place shuguangs ought to be found is the dumpster. The chinese just can't help repackaging the same junk in bottles of exotic shapes and colors. 
sibilence....any cures out there?
Replace the capacitor to the tweeter with some vintage paperIn oil ones. 
Cary 300sei driving Wilson Watt Puppy 7
Clipping SE tube amps will not damage speakers like clipping solid state amps. 
My system is too loud
The gain of the modified Jolida (if thats what your response audio 60W is) is extremely extremely high.You can add a potential divider to the input to attenuate it at the expense of transparency.Ask Response Audio for advice on triode mode which l... 
Audio Research Reference Linestages
Ref 1 is a an all tube 6922 based preamp.Ref 2 is still all 6922 but with 6550C regulatorRef 2 II is a hybrid with JFet input and 6H30.Chassis may look similar but they are completely different animals.I concur with Sutt's opinion. 
Mosfet mist?
I personally like the more tube like sonic signature of mosfets vs bipolars. I recently acquired a Counterpoint SA100 rebuilt by Greenstreet Audio with Exicon mosfets and with some tweaking and replacing of the coupling caps @ the tube gain stage ... 
Wilson Wat Puppy 7 or Avalon Opus Ceramique?
The Wilson is easier to drive and the tweeters are more polite than the Opus Ceramique's. That's based on my experience having owned Eidolons for 11+ years and listened to both Opus Ceramique and Wilson WP7s. WP7s do not sound like WP5s and WP6s. ... 
Fieldcoil drivers
http://www.lmaudio.net/html/speaker/lm-3.htmlavailable in Calgary Alberta at Loyalty Sound. 
Quad ESL Cap mods
Sadly I could not find any photos of the inside showing how I mounted the cap. I remember I took a bunch of them but I could not find them anywhere now. Mine were sold in Sept.Take a picture of yours and I can guide you on how to easily mount them. 
Quad ESL Cap mods
YOu can still use several AXON 250 90uF available for cheap @ Partsconnexion if you dont want a single cap.SPend some $$$ on resistors, the cap does a lot but its not the be all end all to the mod.Placing them outside the box may involve drilling ...