Mytek HiFi Brooklyn AMP + energy amplifier

Big changes are underway at Mytek. First up: the Mytek Brooklyn AMP +, the latest version of the compact Brooklyn AMP class D. The AMP + is already in production.

In my review of the original Brooklyn AMP in 2018, I wrote that the Class-D amplifier had “a consistent sense of truthfulness, impressive resolution that has never been analytical, roomy sound levels, superb dynamics, and some of the” blackest “backgrounds, I’ve ever heard aired … with the right footage. “I continued,” The AMP let me indulge in its bottom-end reproduction with no overhang or bloat and with a deeply impressive recovery of micro and macro detail. But at it his touch was always light and never surgical. ”

Since then, Mytek’s President, Founder and Chief Designer Michal Jurewicz has been employed. At the end of last year, the company parted with its long-time employee HEM, who runs the plant in Poland where most Mytek products have been manufactured to order for years. Every Mytek product has been discontinued due to the split. With the start of the pandemic, Jurewicz temporarily vacated the company’s Greenpoint in Brooklyn, the headquarters of the sparsely populated state of New York, where, freed from everyday stress, he designed new products and planned the company’s diversified future. It was planned to introduce entirely new product lines and update the company’s existing products. First, the Brooklyn AMP + ($ 2,495).

Why class D?
I asked Jurewicz. “The topology of Class D amplifiers is based on a very solid principle,” he replied via email. “When the class D topology is implemented perfectly, the amplifier transfer function is a straight line, which means that the amplifier is perfectly linear and without distortion. The challenge is to get the output square wave as close as possible to an ideal square. If this is the case.” is achieved, the device not only sounds better, it is also more efficient. “Add to that its light weight, far less heat dissipation, and lots of power in a small space. It’s easy to see why many audio manufacturers have entered the Class D amplifier market.

My first stereophile test in 2016 was on the Real Sound Power Amplifier Spec RPA-W7EX, a Class D amplifier that measured poorly but impressed Art Dudley and me. “This humble looking amplifier was positively surgical in retrieving low level information,” I wrote, “but it did not get so easily done without sounding sterile or clinical.”

In the five years since then, many Class-D amplifiers have been launched, proof that Class-D sound has gained popularity as an alternative to heavy, conventional solid-state amplifiers and tube amplifiers that often run hot. The quality of class D amplifiers has improved and become more consistent.

Outwardly, the AMP + from Mytek does not look any different from its predecessor, with the exception of the plus sign in the logo. Its dimensions are the same – a “half frame” – size 8.5 “wide × 1.74” high × 9.5 “deep – as is the facade of the machine, whose textured finish resembles the polished alligator skin, in black or silver The small button on the front provides power to the amplifier. The “M” logo, which is backlit in the colors you choose, disappears when you switch it off. The inputs and outputs on the rear remain unchanged: a pair more symmetrical (XLR) and a pair of unbalanced (RCA) inputs, an IEC AC jack and two pairs of speaker cable tie posts. Nine tiny DIP switches allow the AMP + to be converted from stereo to bridged mono. You can accomplish the same by using download and install the control panel app from Mytek (this is also where you can set the color of the backlight on the front.

The AMP + uses class D modules from the Danish company Pascal A / S, which have been modified by Mytek. The performance specifications are impressive, especially given the small package size: 250 Wpc at 8 ohms, 300 Wpc at 4 ohms, 400 Wpc at 2 ohms. It can be bridged to produce a mono amplifier that can deliver 500 W into 8 ohms and 600 W into 4 ohms.

The original AMP included stick-on nubs for feet. The AMP + has correct screwed-on rubber feet.

Inside are the most important changes. “We modified the AMP’s MOSFET transistors to be at least five times faster,” said Jurewicz. “The AMP + has more detail, which results in a larger, deeper 3D soundstage. There is a faster clock rate from 450 kHz to now 653 kHz. This allows us to move the output filter [higher]which means more air, a lighter top end. It’s less analytical and makes the sound finer with a wider range of speakers. Class D amplifiers typically always have this filter, which is essentially an inductor and a capacitor, at the output; This is supposed to turn the square wave into normal sound, usually around 30 kHz. Moving the filter up will improve the sound because the audio is less affected. “The frequency of the output filter in the AMP + has been increased to almost 50 kHz.

“Sometimes when people hear the AMP + version,” Jurewicz continued, “they say the older Brooklyn AMP had that nice mid-range, which is essentially a grunge created by distortion, but acceptable in the older model too Seems to be. The new one. ” The model is cleaner, has a larger soundstage and more details. The AMP + is more precise. I would try other ways to achieve this sweetness in the mid-range of the earlier AMP, using other components that point in that direction. “The price of the Brooklyn AMP + is the same as the original: $ 2,495. Your Brooklyn AMP can be upgraded to AMP + status at the company’s Brooklyn headquarters for $ 500. An upgraded AMP and a newly manufactured AMP + are electronically and functionally identical, says Jurewicz (footnote 1).

Listen
I rated the AMP + against the AMP with Schiit Sol and Kuzma Stabi R turntables (the latter with the Kuzma 4Point arm and the Koetsu Rosewood cartridge). I also used a Mytek Brooklyn DAC + / preamp, as well as Klipsch Forte III and RP-600M speakers. A 6 ‘pair of Shindo XLR-to-Cinch connectors connected the DAC / preamplifier (as a phono preamplifier and for volume control) to the Mytek amplifiers. Auditorium 23 speaker cables connected the AMP + to either the Klipsch RP-600M or the Fortes.

Footnote 1: In fact, the sample examined is a former AMP from Brooklyn that was upgraded to AMP + status in Brooklyn.

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