Designed to connect to virtually any device, the pair of walnut Audioengine HD6 Powered Speakers provide an analog RCA stereo input, a digital optical audio input, and ?" input. They consist of a 5.5" woofer and a 1" tweeter and can handle 50W per channel RMS, or 75W per channel peak. For your convenience, all connectivity is via the powered left speaker, which connects to the passive right speaker with the included speaker wire. In addition to the included speaker wire, an ?" audio cable, an RCA audio cable, magnetic removable grilles, and an IR remote are also included.
Audioengine designs and manufactures their own speaker drivers and other critical components. In other words, the HD6 is not a "box-built" system with off-the-shelf parts, but includes custom-designed components constructed to their specifications. What they do not fabricate directly inside their factories, they have made to their specific designs - parts such as circuit boards, transformers, magnets, and wiring harnesses, for example.
Efficient Integrated Design
Built-In B1 and D1
The speaker cabinets, drivers, bass port designs, amplifiers, and passive crossovers are all tuned together for the HD6. This, in turn, makes for a more efficient system that requires less power than passive speakers and a separate integrated amplifier or similar A/V components. Audioengine builds all this into the left speaker cabinet to make it easy to connect your smartphone, tablet, computer, TV, network player, or any other audio product.
Audioengine has taken features from the B1 aptX Bluetooth Receiver and the D1 24-bit DAC, and combined some of this circuitry inside the HD6.
High-Quality Bluetooth Audio
Extended Bluetooth Range
The Bluetooth built into the HD6 powered speakers features aptX coding, which is an advanced Bluetooth audio codec with enhanced sound quality. And even if your phone or tablet doesn't have aptX, the HD6 Bluetooth solution is backwards-compatible with SBC and AAC codecs, so you can wirelessly stream music from any Bluetooth-enabled device and still enjoy all your music.
Most Bluetooth implementations have a range of 30', but with careful signal management circuitry and antenna tuning, the HD6 offers a solution that has up to a 100' range for multi-room use, with no degradation in audio quality.
The HD6 Bluetooth receiver and optical input both utilize the AKM AK4396A DAC, which is designed to provide low noise and high fidelity. The optical input configures the AK4396A as a bit-perfect 24-bit DAC, which will process sample rates up to 192 kHz natively. For Bluetooth, the AK4396A is used as an upsampling DAC and will pad all bit depths to 24-bits, achieving a higher signal-to-noise ratio and lower noise floor. Due to the high signal-to-noise specs of the AK4396A, the fact that digital signal is upsampled to 24-bits, and the added benefit of onboard triple redundancy power source conversion and filtering, the HD6 Bluetooth implementation presents impressive low noise and low distortion characteristics.
The amplifiers in the HD6 are located in the left speaker and are a conservatively-rated class A/B analog monoblock design. This is a more traditional speaker/amplifier marriage, which is designed to provide high-quality audio and greater flexibility. All circuit boards for the power and preamp sections are vertically mounted for maximum mechanical shock protection.
Audioengine uses ferrofluid-cooled silk dome tweeters with neodymium magnets. Silk tweeters are designed to hold up well under high power, and the edge-driven design gives a smooth response. The woofers are Kevlar woven glass aramid composite with rubber surrounds. The strength of Kevlar means the woofer retains its shape when being driven at high levels. The HD6 woofers are housed in cast aluminum frames, which provide high rigidity and increased heat dispersion.
Audioengine uses gapless-core toroidal transformers, which have a tighter radiated magnetic field, translating to lower noise. They are lighter than standard "EI" transformers, and also generate less heat.
The HD6 includes detachable grilles that are firmly held in place with hidden neodymium magnets for a clean look.