HR could review the Amp Box RS :-) ........ Of course you proffer dam good advice, as usual. JA observed that, apart from a very low input impedance on its balanced input, "Audionet's Max performed very well on the test bench." You might have the wrong fellow. JVS noted that the pair of Jadis amps—20 output tubes in all!—put out less heat than his class-A Pass Laboratories XA200.8 monoblocks, and praised them for their total lack of noise. Measurer-in-chief JA noted output impedance high enough to have audible consequences (of the nongood variety), plus higher-than-expected harmonic and intermodulation distortion: "I was disappointed by the BorderPatrol P21 EXD's measured performance." Used to play a recording of Rachmaninoff's Symphony 1 through a review pair of Wilson Alexia Series 2 speakers, the Constellation provided JA with "a transparent window on the acoustic of the Amsterdam hall where the recording was made," with stable and appropriately scaled imaging of solo instruments. JVS used a pair of V3.0s to drive his Wilson Alexia 2 speakers—he reported preferring the sound with the tubes biased at 190mV—and enjoyed their signature "warm, glowing, nonfatiguing, well-controlled, finely detailed sound," though he felt that the sound was "a mite bass-shy." . They sent out a letter to dealers over a year ago announcing that they were "leaving the headphone category," and they stopped producing the nightbirds at that time. To ensure that ours was an exemplary sample, for the sake of measurements if nothing else, HR tried a factory-built sample and found the 60Wpc GT-102, which is based on the same power op-amp as the well-regarded 47 Laboratory Gaincard integrated amp, had a "warmer, darker" sound than that of his Pass Laboratories XA25. (Vol.34 No.12 WWW), Rogue Audio Stereo 100: $3495 Now comes with hand wound output transformers; tube bias balance control, add $800. Both single-ended and balanced inputs are provided on the rear panel, while the front panel is home to a digital display that reports temperature, DC offset voltage, and various fault conditions. It's fully analog, using traditional power-supply technology, and each channel's output section employs 24 bipolar output devices, for a specified power output of 125Wpc into 8 ohms. Jacob Green — February 12, 2020 02:00 in Audio Amplifier Reviews Theory Audio 9CH … (Vol.42 No.4 WWW), Emotiva XPA-2 Gen3: $999 (two-channel version) $$$ In 2017, JCA embarked on an interesting pairing—PS Audio's "big brute" amps with the sensitive, easy-to-drive DeVore Fidelity Orangutan O/96 speakers—and discovered that while the DeVores didn't necessarily benefit from such a surplus of power, he "slightly preferred the BHKs' weight" to the "airier, spacier" sound heard with his Leben tubed integrated amp. LG praised the No.536 for exerting "a superior grip" on the woofers of his Revel Ultima Salon2 speakers, and for reproducing deep organ-pedal notes "with unflinching control and solidity." Writing from his laboratory, JA noted that the Pass far exceeded its rated power output, concluding that "the XA25 performed well on the test bench, as I've come to expect from Pass Labs." Now I have heard both the LS50 and Reference 5 in various systems. (Vol.38 No.8 WWW), Bel Canto Design e.One REF600M monoblock: $4990/pair $$$ . His conclusion: "an extraordinary amplifier." The output section is class-AB, designed so that each individual phase of the signal waveform is amplified by a complete push-pull output section; there are two complete push-pull amps in each channel, their outputs combined—using autoformers—in what McIntosh refers to as a Quad Balanced architecture. The unit has a sleep mode that turns the LCD screen off after a specified time. This new product is suitable for higher quality performance in an excellent energy-saving setup. Other refinements include a gruntier power transformer, brawnier speaker connectors, an increase in power-supply filter capacitance, and other niceties. Alpine MRV-M500 Power Digital Amplifier. The 350Wpc, class-AB No.534 stereo amp can be seen as a less expensive alternative to Mark Levinson's 400W No.536 monoblock (see below). JA reported from his test bench that the Doshi's measured performance "indicates conservative audio engineering." If you like tube amps and you also harbor a fondness for audio-frequency transformers, you may well love the Rogue Stereo 100, which greets the input signal with a Jensen line-level transformer—this as much to buffer unbalanced signals as to couple balanced signals that enter via the Rogue's XLR jacks—then hands off to dual-triode–based input and driver stages with a pair of KT120 output tubes per channel, operating in class-AB push-pull, with the user's choice of switch-selectable Ultralinear and Triode modes. Then again, through the Technics SB-C700S speakers, the sound of the Emotiva had HR reaching for words like "hard" and "transistor sound." (Vol.41 No.4 WWW), Air Tight ATM-300R: $18,500 with Electroharmonix 300B tubes As with a relative few of audio history's most distinguished solid-state amps, the Centaur uses all N-channel transistors; here, they're built into single-ended modules, themselves combined into what Constellation calls their Balanced Bridged topology. By Hassam Nasir July 18, 2020. If you have a good pair of speakers or headphones already, all you need is a stereo amplifier these days (for most people at least). Both single-ended (RCA) and balanced (XLR) inputs are provided on the rear panel, where one also finds a removable panel for access to the amp's two dual-triode tubes. . It's specified at 20Wpc into 8 ohms and 40Wpc into 4 ohms and runs a bit hot—but not as hot as one might expect from a pure class-A amp of the same output. The amplifier has a built-in wireless Bluetooth that enables you to stream music. This amplifier has LCD that displays volume in dB per channel. The class-AB, 400W (into 8 ohms) No.536 is distinguished by many of the same technical characteristics seen in other recent Mark Levinson products, including a direct-coupled, fully discrete signal path and the fact that, while the No.536 uses some negative feedback, its overall gain structure is designed for linear open-loop performance before that feedback is applied. Perhaps this rule only applies to Class A, I may have just answered my own question. The LCD-X is an example of that: JA owns a pair and uses them often. I do not approve of my GMCorp. The best guitar amps to buy in 2020: 14 best solid-state amplifiers Once upon a time, tube tone was all that mattered to guitar players. More to the point, Jason heard from the Jadis amps a sound that was "smooth, supremely well balanced, and captivatingly beautiful," though he noted that frequency extremes were not as well served as with his Passes, resulting in a lack of sparkle with some recordings, less impactful bass with others. There was a good deal of movement in this week’s edition of Power … It is not very clear (at least to me) how items rated in one class are subjectively considered to be superior performers to those in the class below. I have a super bowl that holds 5 cups of cereal. MF described the M28 as "a powerful, beautifully built amplifier" and praised it as "faultlessly smooth and rich in the critical midrange," adding that "[e]ven a diehard tube lover would be impressed." You can't say you haven't been auditioned in a long time. The solid-state Aegir amplifier uses a proprietary class of operation called Continuity, which gets around certain limitations of class-AB operation—particularly transconductance droop beyond the class-A power envelope—by means of a current-feedback topology. But he found the M28 to be "more smooth and sweet than fast and tight," and suggested that its top end was "insufficiently fast and precise for my taste." 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