Many many areas of sound/ speaker performance were better. System 2 = DAC2-HGC and AHB2 driving the same Yamaha NS-2K speakers. System 1 = An old Accuphase P300 with 180W per channel measured (claimed 150W), and a slew rate over 20v/ms, driving a pair of Yamaha NS-2000 speakers. Let me (try to) explain what I experienced and then pose a question for those perhaps able to answer it slightly more scientifically. After some old school analog blind testing it seems there is something to the thoughts others have voiced regarding grunt and attack (lack of power). I like it so much that I just ordered a second AHB2.īut it's not for that slightly obvious reason. Accurate, transparent reproduction of what is recorded without colouration or alteration. These benchmark products support the studio-level XLR connections where 0 dBFS is typically calibrated to 22 or 24 dBu. With Benchmark DACs (DAC1, DAC2 or DAC3) or preamplifiers (LA4 or HPA4), you will want to run your AHB2 amplifiers at minimum gain (9.2 dB stereo or 15.2 dB mono). Operating at high gain will almost always increase the noise in your system because you will be amplifying the output noise of the preamplifier or DAC. In your case you would be forced to run the AHB2 at high gain just to match the excessively high gain of the E-480. Also, the 1 dB difference in gain is problematic.įurthermore, there is no need to run amplifiers at a gain of 23 to 29 dB if you have a good preamplifier or DAC. This means that you will have phase issues at the crossover frequency. The delay through the AHB2 and the E-480 will not be the same. I would not recommend using different amplifier models in any biamp configuration. Running the amp in the second highest gain setting seems like asking for trouble. How can I gauge the best balance between avoiding speaker damage through over extension of the woofer and not running out of dynamic headroom in the DSP? But looking at the images attached it is clear that the headroom required to get close to a semi linear response is significant. It goes without saying that the DAC2 and AHB2 allow huge freedom with gain due to their low distortion, something I am grateful for at the moment. However, I am also mindful of over driving the speakers with too much correction as the AHB2 in mono at max output exceeds the speakers max power by 230W (speakers rated to 250W / 6 ohms nominal / 90dB/W/m) What I am thinking is that using the headroom requirement from the PEQ filter I generate in REW, then adding the 10 dB which DIRAC requires, will give me a gain setting which will prevent clipping. I remember reading something on here regarding the nominal gain setup between DAC2-HGC and AHB2 was to have the volume knob somewhere between 10 and 2 for nominal listening levels. This results in a 80 dB level with the DAC2-HGC volume positioned at roughly 12 o`clock depending on program/ content. AHB2 set to Mid-Gain = 14.2 dBu (4 Vrms), I tried the lowest AHB2 gain setting but the DAC volume was maxed out to achieve 75 dB.
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