dhl93449

Responses from dhl93449

Impressions of PS Audio GCPH
nipplewhatever:Visiting this post after a few years.Your comments are just stupid, as you did not read carefully what I was saying. When you measure the noise of a preamp (which is what I was clearly doing), you user the source impedance of the ca... 
Recommendations for electronic crossover.
really provided sonic equivalence, all discrete designs would be gone in a heartbeat. 
Recommendations for electronic crossover.
phusis" Whether it makes sense or not is a matter decided by the ears, not theory, but of course: if what your ears tell you is in favor of a passive configuration - in a specific, singular component context, that is - then that’s what it is to y... 
Recommendations for electronic crossover.
Well, I finally finished my discrete Class A XO project. I used my own design discrete op amps, based on an early Spectral design modified with Nelson Pass inspired JFet output stages (instead of MOSFET stages as originally used by Spectral). I am... 
Pure Audio Project open baffle speakers
douglas:As an addendum, since you mentioned VH Audio. I am using their teflon caps in the critical low pass and high pass filters. 
Pure Audio Project open baffle speakers
douglas:Well I decided to build my own active XO, based on a class A discrete op amp design (a modified Spectral design using a Pass Labs type JFet output stage). Took quite a while to build and test due to the number of amps involved. Also had to... 
Pure Audio Project open baffle speakers
douglasI considered the C1. I do believe that is the one designed by Nelson Pass for PAP. That gets a lot closer to what I want, and does roll off the drivers properly as opposed to the Leonides passive XO. The C1 and the Leonides are night and da... 
Recommendations for electronic crossover.
phusisIts all a matter of degree. Whether an active XO system using IC op amps sounds better than a passive system with the best Mundorf or other high end caps, inductors, and resistors may be arguable. But it makes no sense to me to place an EQ/X... 
Recommendations for electronic crossover.
Arguing about whether bridging is good or bad misses the point. Many base designs (such as those from Nelson Pass) are bridged inherently. They allow the use of lower power supply rail voltages and therefor reduce power consumption, particularly w... 
Pure Audio Project open baffle speakers
douglasDifferent resistors and capacitors will not change the basic design, which is that of a first order XO. This means that both the horn and bass driver will be operating (and fighting each other) in the lower mid range below 1K Hz. The Eminen... 
Pure Audio Project open baffle speakers
I have a set of PAP Trio with Horn 1 midrange. They replaced a set of B&W 803Ds. Here are my impressions:I am using the Leonides XO. Have very mixed feelings about this XO. It is a first order XO and does little to roll off either the bass dri... 
Capacitors for HP filters in tube amps recommendations?
Well, everyone's "first hand experience" will be different. Wima makes excellent industrial caps. I used them in my Spectral DMC 10 rebuild as the final output coupling caps and they sounded good. But the Mundorf silver gold oils sounded much bett... 
Repair your Cambridge Audio 840E volume contol issues
To answer some of the accumulated questions over the past few years:My unit has not misbehaved once since I published the mods with the Fujitsu relays, and I use it every day. Note I did not replace the encoder, only the relays. I also have my uni... 
Capacitors for HP filters in tube amps recommendations?
pragmasiYou need to be cautious when recommending CGO/NPO ceramics for audio (particularly coupling not bypassing) applications. I know from experience that some NPO/CGO caps (particularly those from TDK ceramics) have a voltage coefficient of cap... 
B&W 802D tweeter replacement
At the online B&W parts store, the tweeter for the 800D series is available as a separate part, SKU 14265:http://www.bwgroupusa.com/bwgroup-parts/index.php/bw/speakers/800-series/800d-series/803d/800d-tweet...It is priced at $1086. Not much ch...