![]() ![]() The touch screen provides easy access to advanced features such as balance control, input level offsets, input names, screen dimming, remote control, and function locking. The trigger ports are compatible with most industry-standard trigger input or output ports, but can communicate bidirectionally with other Benchmark products. The trigger signal controls the power-up and power-down sequencing of the entire audio system. Two bidirectional 12V trigger ports can be used to link the HPA4 with external D/A converters and power amplifiers. With the HPA4 inserted, the DAC3's 32-bit digital gain control is replaced by the HPA4's more-resolving fully-analog relay gain control. The HPA4 can be inserted between a Benchmark DAC3 and AHB2 without degrading the system noise performance. The HPA4 is the only line amplifier/preamplifier that we recommend inserting between a DAC and the AHB2. In contrast, other preamplifiers limit the system noise performance because they cannot match the SNR performance of the AHB2. This means that the HPA4 will extract the full performance of the AHB2. It may be the only preamplifier or line amplifier that exceeds the signal to noise ratio of the ultra-quiet AHB2. The HPA4 is the perfect complement to the Benchmark AHB2. When paired with a Benchmark DAC, a single remote control will operate both units. The HPA4 is designed to work with the Benchmark DAC2 and DAC3 converters but may be driven from any high-end D/A converter. The HPA4 includes IR remote control and can be operated using the optional Benchmark remote. The line amplifier provides one balanced stereo output, one balanced mono sum, and one unbalanced stereo output. The HPA4 features two balanced stereo inputs and two unbalanced stereo inputs. However, we recommend the XLR4 due to its lower contact resistance. Both outputs deliver the full performance of the HPA4. The headphone output of the THX-888 amplifierfeatures a 1/4" TRS and a 4-pin XLR. This means that musical instruments are rendered without changing their sonic character. The HPA4 will deliver musical overtones with life-like accuracy. ![]() Wave shapes are accurately reproduced, and the entire spectrum is delivered with precise timing. This means that the HPA4 delivers very precise amplitude and phase accuracy over the entire audio bandwidth. The bandwidth of the HPA4 extends from 0.01 Hz to over 500 kHz. These include DC detection, short-circuit detection, over-current protection, over-voltage protection, and thermal protection. Given these extreme capabilities, Benchmark has incorporated several protection systems to protect expensive headphones and the amplifier itself. The HPA4 delivers 11.9 Vrms into 300 Ohms and 6 Watts into 16 Ohms. The THX-888 amplifiercan cleanly deliver high voltage into low-sensitivity high-impedance headphones and it can cleanly deliver high power and current into low-impedance headphones. High Voltage, High Current and High Power The HPA4 eclipses the performance of typical high-end preamplifiers by achieving much lower noise and distortion. The HPA4 is designed to provide the ultimate analog signal path between inputs and outputs. It is designed to be driven from an external D/A converter or an external analog source. To make this all happen, the HPA4 includes a total of 64 precision relays. The HPA4 includes 4 independent 256-step attenuators: two for the L&R headphone outputs, and two for the L&R line outputs. ![]() No other relay gain control offers this level of precision and performance. Relay closures are precisely timed to deliver silky-smooth volume changes. The gain control has 256 steps in 0.5 dB increments. The line amplifier incorporates the finest gold-contact relays available. The THX-888 amplifier is driven by a Benchmark line amplifier that features relay gain control, relay input selection, and relay muting. The HPA4 delivers power, audio fidelity, speed and accuracy over an utterly silent background. Hear the music without any contamination from electronic noise or distortion. THX AAA allows the amplifier to reach its maximum output power and sound pressure level (SPL) without producing the distortion that normally accompanies increased output levels in traditional amplifiers.įeaturing the flagship THX-888 amplifier design, the revolutionary HPA4 headphone amplifier incorporates the same THX AAAtechnology that Benchmark uses in the AHB2 power amplifier. It accomplishes this using a patented feed-forward topology to null conventional distortion and noise mechanisms, resulting in the world's most linear amplifier. THX AAA™ reduces harmonic, intermodulation, and crossover distortion by 20 to 40 dB to guarantee a realistic and fatigue-free listening experience. ![]()
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