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Bryston BHA-1 Headphone Amp/Preamp Reviewed

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Bryston-BHA-1-headphone-amp-angled-small.jpgHeadphones, if you haven't heard, are the new speakers. But many headphone users are relying on the pitiful amplifiers embedded in their MP3 players or CD spinners as the primary connection for their headphones. Also, a number of these same listeners are complaining that their headphones lack bass, dynamic drive and detail compared with conventional room-based loudspeakers. The problem may not be with their headphones, but with the headphone amps.

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• Find more reviews in our Headphone Reviews section.
• Explore more products in our Digital to Analog Converter Review section.  

Bryston, which has made bulletproof power amplifiers and preamps for over thirty years, has a solution to the "wimpy headphone amplifier syndrome." It's called the BHA-1 ($1,395). Designed to handle everything from 115 dB sensitivity earbuds to 600-ohm professional cans, the BHA-1 may be the last headphone amp you'll ever need.

The BHA-1 is primarily a headphone amplifier but, as you will see, it can also serve as a minimalist two-channel preamplifier. On the back, you will find three stereo inputs - one balanced XLR, one single-ended RCA and one single-ended mini-stereo input. There's also one pair of balanced XLR outputs that can be used to drive an amplifier. The balanced XLR output's level is controlled by the large volume knob on the front panel, which in essence turns the BHA-1 into a preamp. Instead of merely passing a fixed-output line-level signal, the BHA-1 has a variable output level, making it suitable for pre-amplifier duties. The only limiting factor for pre-amp use is there is only one pair of outputs, so if you regularly use a subwoofer, as I do, you will either need to use a splitter to gain a second output, run your signal first to your subwoofer and then to your speaker's power amplifiers, or use a second pair of speaker cables from your amplifiers to your subwoofer. All three schemes work - it merely depends on your ancillary gear's inputs as to which will work best.

The front panel of the BHA-1 has a three-way toggle switch for input selection, and a two-way gain switch that delivers either 14 or 20 dB of gain. Other front panel controls include a large volume control knob, a smaller balance control knob, a on-off toggle switch, a single-ended quarter-inch stereo headphone output, a balanced XLR stereo output and a pair of XLR balanced mono L/R outputs. All of the front panel outputs are active at all times. The rear output is also active at all times, even when the headphones are plugged into the front panel. This is somewhat unusual, since most DACs with built-in headphone outputs, such as the Benchmark DAC-2, April Music Eximus DP-1, and the Mytek Stereo 192-DSD DAC, mute their rear outputs when a headphone is attached. When you plan to listen to headphones alone (which is how most people listen), you will need to turn off your speakers' (and subwoofer's) amplifiers.

Audiophiles who are new to the headphone thing might wonder why the BHA-1 has two gain settings. This makes the BHA-1 far more useful, since it can drive both high-sensitivity in-ear monitors and lower-sensitivity high-impedance studio headphones. Usually, if a headphone amp is designed for high-sensitivity earphones, it lacks enough drive to push high-impedance headphones to adequate volume levels. If a headphone is designed for higher impedance headphones, it often has too much hiss and too high a volume level to work properly with high-sensitivity in-ears. The BHA-1 can handle both extremes with aplomb.

The BHA-1's volume control deserves a special mention. Most volume controls do most of their work in the first half of their rotation, and the second half does little to increase the volume levels. This is usually referred to as "an audio taper." The BHA-1 doesn't use an audio taper. Instead the volume level increase for the first quarter of its rotation is very gradual. Only during the last quarter-turn does the volume level get much louder. While this different taper may take a bit of time to get used to (especially if you are also using the BHA-1 as a preamp), it allows for much finer level adjustments than an audio taper, especially when combined with the two-position gain adjustment switch.

Available in either black or silver finish, the BHA-1 is housed in a full-width 19-inch chassis that has provisions for rack mounting. Its depth is only seven inches, which could make stacking half-width 12-inch-deep cabinets, such as most Stax headphone amplifiers, rather precarious. But there's an even better reason for not stacking components on top of the BHA-1; it really needs breathing room for heat dissipation. I found that unless I gave the BHA-1 at least two inches of space above and below for adequate ventilation, it could go into thermal shutdown after running for more than half an hour. Turning the BHA-1 off for a few minutes solved the shutdown, but proper ventilation for the BHA-1 is a must, unless you enjoy periodic musical interruptions.

The BHA-1 is available in two versions. The standard version uses an internal power supply, but for an added cost, the BHA-1 is available with an external power supply. My review sample was the standard version with an internal power supply. Given the review unit's lack of noise and over 105 dB S/N specification, I found little reason to long for the more expensive external power supply version.

Given that many top-quality DAC/preamplifiers come with at least one high-quality headphone output, why would anyone need a dedicated headphone amplifier such as the Bryston BHA-1? The answer is quite simple - the BHA-1 is far more robust and flexible than any built-in headphone amplifier I've heard. Even the high-quality headphone amplifiers in the Benchmark DAC-2, Mytek 192-DSD, and Stello Eximus DP-1 suffer by comparison with the BHA-1, even when asked to drive an "easy" load, such as a Sennheiser HD-600. When you plug in a difficult headphone, such as the Beyer-Dynamic DT-990 600-ohm version, the sonic differences between the BHA-1 and built-in headphone amplifiers is even greater. The DT-990 sounded more controlled, with much better bass extension and detail when tethered to the BHA-1.

Read more about the Bryston BHA-1 headphone amp on Page 2.
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