Emotiva DMC-1 Preamp/Processor and MPS-1 Multichannel Power Amplifier Measurements

Measurements

All measurements were made in balanced mode unless noted otherwise.

The Emotiva MPS-1's balanced frequency response was -0.57dB at 10Hz, -0.16dB at 20Hz, -0.46dB at 20kHz, and -2.54dB at 50kHz. Its single-ended frequency response was -0.58dB at 10Hz, -0.16dB at 20Hz, -0.12dB at 20kHz, and -0.71dB at 50kHz. The amplifier's S/N ratio (A-weighted, 10Hz-24kHz, 2.83V@8Ω) measured –86.9dB (single-ended) and -92dB (balanced). Its gain measured 25.9dB (balanced) and 27dB (single-ended).

THD+noise at 2.83V into 8Ω measured 0.016% at 20Hz, 0.015% at 1kHz, and 0.015% at 20kHz. At 2.83V into 4Ω, the corresponding results were 0.015% at 20Hz, 0.016% at 1kHz, and 0.015% at 20kHz.

Driving all seven channels into 8Ω, the MPS-1 delivered 169Wpc at 20Hz and 175Wpc at 1kHz (to the nearest watt) before clipping (1% THD+noise). The channel measured, in position #1, failed during the 20Hz test and did not recover.

Into 4Ω, with the remaining six channels operating, the MPS-1 delivered 215Wpc at 20Hz and 245Wpc at 1kHz.

With only two channels operating, at 1kHz, the Emotiva clipped at 187Wpc into 8Ω and 280Wpc into 4Ω.

Comment: We were surprised to see an amplifier channel fail on the test bench. This is rare, but test-bench procedures do stress an amplifier to the max—a situation rarely encountered in real-world operation at 20Hz with all seven amps operating. But the defective module SS experienced in the same amplifier bay does raise some concern. The replaceable modules in the MPS-1 should make correcting any such problem in the field a relatively simple matter. Our experience with a wide range of electronics suggests that such failures normally happen early in a product's life—or when it's in the hands of a reviewer!—TJN

COMMENTS
darrendemers12's picture

Typically, Dan Laufman, the senior partner in Emotiva, would reply to you directly, but unfortunately he is out of town at the moment and unable to respond. First off, from all the guys at Emotiva, I would like to thank you for your thorough and thoughtful review of our home theater processor and amplifier.

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Before publishing this review, we sent a copy to AV123 for fact-checking and to provide an opportunity for a manufacturer's comment, as is our standard practice. We received their response and made the necessary factual corrections; however, we chose not to publish the engineer's comments right away, as they were mixed with the corrections. Typically, a manufacturer's response is presented more formally, with a clear distinction between corrections and additional comments. When Steve Ozmai from AV123 asked why their response wasn’t posted, I clarified the situation and offered to publish their response immediately upon receipt, allowing them the chance to remove any extraneous material not relevant to the published review. Zorse Wordle

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