Μετά από αρκετό καιρό, review σε ενισχυτή AV, του Denon AVR-X1700H από το audio.com.pl.
Denon rozpoczął ten sezon właśnie amplitunerem AVR-X1700, występującym w dwóch wersjach – podstawowej AVR-X1700H (z tunerem FM) i AVR-X1700H ...
audio.com.pl
Technical Specifications
DENON AVR-X1700H
Type of AV receivers
Number of tips 7
Power 8 [Ω] (1% THD + N, 1 kHz) [W] 2K 121
Power 4 [Ω] (1% THD + N, 1 kHz) [W] 2K 43
8K scaler
Dolby Atmos, DD, DD Plus, Dolby Surround, Dolby TrueHD, DTS: X, DTS, DTS-ES, DTS HD, DTS 96/24 surround decoders
Sensitivity (for maximum power) [V] 0.19
Dynamics [dB] 102
Signal / noise ratio (A-weighted filter, referred to 1W) [dB] 81
Damping Factor (referred to 4 Ω) 46
Power 8 [Ω] (1% THD + N, 1 kHz) [W] 5K 63
Power 4 [Ω] (1% THD + N, 1 kHz) [W] 5K 43
Power 8 [Ω] (1% THD + N, 1 kHz) [W] 7K 49
Power 4 [Ω] (1% THD + N, 1 kHz) [W] 7K 41
Rated power 4-Selector impulse 8 Ω (1% THD + N, 1 kHz) [W] 2K 137
Rated power 4-Selector impulse 8 Ω (1% THD + N, 1 kHz) [W] 5K 57
Rated power 4-Selector impulse 8 Ω (1% THD + N, 1 kHz) [W] 7K -
Dimensions: H / W / D, In the case of devices tested in AUDIO, the measured value.
Lab
Fig. 1. Bandwidth.
Fig. 2. Harmonic distortions.
Fig. 3. THD + N / power.
Denon AVR-X1700H Laboratory
Denon gives power at 8 Ω, it is supposed to be 80 W, but note: at a much lower than the standard THD + N level - 0.08%. So, at 1%, you can expect better results… and they are actually better, and much better.
With 8 Ω and two channels driven simultaneously (i.e. in stereo operation) we have as much as 2 x 121 W - that's well over two times more than with the Onkyo and Pioneer.
When connecting subsequent channels, the power drops systematically, through 5 x 63 W to 7 x 49 W, but in each configuration the Denon has an advantage. Its Achilles' heel is the power drop when turning on the impedance selector in the 4-ohm mode.
Then the power drops dramatically, to just over 40 W in each channel, although no matter how much we load them at the same time. We know Denon receivers for this safety-related behavior, resulting from the superiority of the goal of reducing heat generation (which would increase even with the same power on a 4-ohm versus an 8-ohm load).
As much as such a margin of safety seems excessive, but we can ignore these recommendations, resulting more from the applicable safety standards than trying to obtain the best parameters and sound, leaving the 8-ohm mode also with a 4-ohm load (especially that we may not even be aware of that we are dealing with such impedance, because loudspeaker manufacturers promise 8 Ω more often than they should). Then the AVR-X1700H will go to the max and squeeze out almost 2 x 200 W!
Or almost 5 x 140 W, only with seven channels driven at the same time the power drops significantly - to 7 x 57 W, when the receiver turned off. In practice, such tuning of all channels will probably not happen.