Stereophile download pdf

Sure, I recall. Bob Carver is a clever guy, maybe more clever than our typical High End Manufacturer. I was manufacturing Turntable accessories at the time. HR, Mr. Dudley and a few others able to discern differences in Cabling, Amps, Phono Carts. Back then we did have an abundance of review writers promoting product with Broad Stroke Endorsements. Overall our highest Integrity Authority has always been Mr.

JA of Stereophile although he hasn't the articulate ear of his Mr. Herb R. Carver was always a sharper Spoon in the drawer than most of our tweaky manufacturers. I was wondering how come KR could distinguish the piano provenance in the two Proust recordings but heard a cello in the Harmonia Mundi one… Mixing up the players is one thing, obviously a typo, but mixing up the instruments?

Guilty on both counts. I do know better, enough not to make an issue of comparing the "two cellos. Now fixed. Thanks to Jim and you. An exciting turning point for Class D when purchased by Kalman Rubinson and excelling at the stringent testing of John Atkinson. Both no small feats. Superb progress by Bruno Putzys, et al. Light weight, cool running powerful amps that, in some cases surpass Class AB. Is the M22 V2 the 2 channel equivalent of the M28 or is that 2 channel offering yet to come?

In the most fundamental way, yes but not exactly. NAD uses the same amp modules in both as well as in the M33 but the input stages, power supplies, features and packaging vary. The Absolute Sound excuse me characterized the C as being "forward sounding" in the upper mids and treble, and noted that care in system matching might be called for as a result. Likewise, if the comparison here is to the PS Audio that Michael Fremer reviewed, I note that he was far from complimentary about some aspects of its sound: "The piano [in its upper registers, had a] a slight "ringy" quality, a glare or glow around the notes, like a parasitic halo.

The vibraphone had it throughout its range, combined with a blunt and less-than-satisfying roundness to what should be a shimmering bell tone. Perhaps a better comparison would be to the PS Audio Ms, which are closer in price and power output than the Ms. I can commend an audition of the Ms to anyone seeking high powered amplifiers. I think they are wonderful. Why are some of the bench test sins of Class-d hidden by the use of the low pass AUX filter just because the input of the SYS analyser can't handle the residual switching noise on the amp being tested speaker terminals.

Wouldn't it be best to get the input of the analyser headroom raised to take the residual switching noise, so all can then see what's really comming out of Class-D's speaker terminals? I get what you mean about presenting the raw data, but are you suggesting that you can hear ultrasonic noise or that it has any relevance? Forget 25khz or even 50khz which is already outside your ability as a human to perceive. The rest of the ultrasonic noise is remarkably clean and subdb down.

Even if your ears could hear that, do you think your loudspeaker is responding to that signal at all? Put it out of your mind. If you want to talk about sins then talk about the amps that cost multitudes of the C which show horrendous distortion and noise ALL within the actual audioband!

The C presents as clean of an audioband as anyone can hope for at this power output and at any price. I had to replace a friends pair of Watt Puppy 7's tweeter diaphragms, because the the voice coils turned blue with heat after 6mts of constant little too high level of this "ultra sonic bombardment", from a very well known reviewed here Class-D monoblocks.

So let the warts and all be seen, and get the AP analyzers input changed so it doesn't over load so we can see everything. Linear amps in the past were always shown by Stereophile if they oscillated, why not these too, even though it's for different reasons, but still ends up at the speaker output terminals. Your reply makes it sound like I lack reading comprehension, but nowhere did you claim to have first-hand experience with damage to speakers from Class D.

Nuforce Reference-9SE V2 or 3 monoblocks with newest Nuforce updated output filters, and the owner never pushed his speakers. Just the tweeters started to sound off over time, he sold them after I showed him the bluing of the old voice coils when like I said I replaced them with the new ones, and after that he went back to his Halco DM68's.

Search form Search. Solid State Power Amp Reviews. Kalman Rubinson May 21, Power amplifiers should be boring. They have a single, well-defined function: Make the input signal large enough to run a loudspeaker so that it makes sound at levels suitable for listening to music.

Generally, controls and features are few or none. Peter Walker of Quad famously defined the ideal amplifier as a "straight wire with gain. NEXT: Page 2 ». Log in or register to post comments. There is a pdf of the December issue of "Wireless World" here. Certainly, you are that high integrity listener that was impressed. What will the next Decade bring? Tony in Venice Florida. What's next is that Bruno Putzeys will Submitted by Ortofan on May 21, - pm.

Submitted by JRT on May 22, - am. Submitted by tonykaz on May 22, - am. What do Conrad-Johnson tube Amps sound like? Do you not recall the Submitted by Ortofan on May 22, - am. I have never owned any piece of Carver Gear. Quote: Submitted by Kal Rubinson on May 22, - am. I agree with your comment. Your wording better conveys the notion I had intended. Thank you for another interesting review on another interesting component.

Submitted by NIkos Razis on May 22, - pm. I do Submitted by Kal Rubinson on May 23, - am. Quote: Submitted by Kal Rubinson on May 23, - am. Submitted by Long-time listener on May 23, - am. So: Aren't we still pretty much in Class D territory here?

Or not? Please comment. I just don,t get it J. Submitted by georgehifi on May 23, - pm. Cheers George. I get what you mean about Submitted by tabs on June 1, - am. Quote: Submitted by Kal Rubinson on June 1, - am.

Even if your ears could hear that Submitted by georgehifi on June 1, - pm. Linear amps in the past were always shown by Stereophile if they oscillated, why not these too, even though it's for different reasons, but still ends up at the speaker output terminals Cheers George.

Submitted by tabs on June 1, - pm. Name names. In the foreground is a new post FM demodulation filter to deal with the self-noise generated by HD Radio. The following is a note from David Gill showing how to modify the FM Reference for European de-emphasis and indicating how to change from V to V power or vice versa. Thanks again to David for his gracious help to Sequerra owners world-wide.

He has the requisite knowledge base and documentation to successfully work on these complex tuners. His email is davidgill cox. Read his very informative paper here. Highly recommended! I've compiled information here on the following tuners related to the original Sequerra Model 1. Each numbered item shown here has a detailed section below with photos, marketing materials and reviews.

David Day was president and chief engineer of Davidson Roth and acquired the rights to the Sequerra in DaySequerra FM Studio Tuner, introduced in was an all new design, designed and built to a lower price point.

DaySequerra FM Reference. Introduced in , this was a newly designed tuner, using the foundation of the original, but updating and adding functionality details below. See links and photos at top of this page for more details. I've also included some additional information of interest:. Additional marketing materials from DaySequerra, including a list of US dealers and pricelist from Click to enlarge.

Notice the layout and labels are identical to the original Sequerra Model 1, including the Dolby button. Note that this card was folded in the center to stand as a tent, so the top image appears upside down here and on the printed card. When folded, the tent card showed the wood cabinet version on one side and the rack-mount version on the other side. Note that by this time the company was referred to as "Day Sequerra" not "Davidson-Roth". This tuner is significantly different from its predecessors.

The internal circuitry is different, mostly on a single large PCB. The controls are also changed to reflect circuit changes: There are new selectable IF bandwith switches on the right wide, normal and narrow , and on the left, switches for audio phase inversion and stereo contour override. Gone is the obsolete-before-it-got-started Dolby switch from the original Sequerra. Above: FM Studio Tuner, front view. Note that the switch functions have been changed as described above.

This photo was copied from FMTunerInfo. Above: FM Studio Tuner, internal view. Above: FM Studio Tuner, rear view. It, however, incorporates a number of circuit improvements, including the option of the panoramic analyzer.