Marantz NA 6005 Net­work Player

Australian HIFI - - LAB REPORT -

It’s also im­por­tant to note that mu­sic sig­nals don’t get as high as 0dB, due to the ne­ces­sity to leave some head­room when record­ing, so you won’t ever run into any 0dB-level sig­nals when play­ing back recorded mu­sic from any medium.

Graph 3, which shows dis­tor­tion at –10dB, shows the level of dis­tor­tion you could ex­pect when play­ing typ­i­cal mu­sic tracks. There’s only a sin­gle har­mon­i­cally-re­lated com­po­nent at –123dB (0.00007%). At a level of –20dB, even this com­po­nent has dis­ap­peared, so there are no dis­tor­tion com­po­nents vis­i­ble above the noise floor at –140dB. Note, too, that the level of the sam­pling-re­lated arte­fact has dropped to –129dB (0.00003%).

Dis­tor­tion at very low lev­els was ex­cel­lent, as shown in Graph 6, which shows dis­tor­tion at –91.24dB and Graph 7, which shows it at –90.31dB. Other than the slight dif­fer­ence in level, the dif­fer­ence be­tween the two test sig­nals is that the one at –91.24dB has not been dithered, whereas the one at –90.31dB has. The im­prove­ment in dis­tor­tion is the rea­son

all mu­sic stored dig­i­tally is dithered. The only dis­ad­van­tage to dither­ing is a slight in­crease in the level of the noise floor. You can see that without dither­ing the noise floor is well below –140dB, whereas with dither added, the noise floor sits just above –140dB. Since this level of noise is well below the level of elec­tronic noise of most hi-fi am­pli­fiers, it’s of no con­se­quence.

The IMD re­sult was in­ter­est­ing, be­cause the im­me­di­ate side­bands are ex­tremely low, and there is a high-level com­po­nent at around 25kHz that’s just 40dB down and another at around 26kHz. This is fairly atyp­i­cal be­hav­iour, but be­cause they’re well above the limit of hu­man hearing, they’re merely in­ter­est­ing arte­facts of the par­tic­u­lar DAC Marantz is us­ing, and pre­sum­ably re­lated to the sig­nal at 15kHz. The sig­nal that is usu­ally present that you don’t want to be au­di­ble is the dif­fer­ence sig­nal down at 1kHz, and you can see that it’s around 125dB down, which is more than suf­fi­cient. The same sam­pling arte­fact is ob­vi­ous when the NA6005 is re­pro­duc­ing a sin­gle 20kHz tone at 0dB, though this time it’s just a sin­gle com­po­nent at 25kHz, but at –37dB.

Over­all THD vs. Fre­quency is shown in Graph 11 for both a –1dB sig­nal (red trace) and one at –20dB. The lev­els are very low, and also uni­formly low across the au­dio band, so ex­cel­lent per­for­mance again from the Marantz NA 6005.

Lin­ear­ity er­rors were very low, as you can see from the tab­u­lated chart, av­er­ag­ing around 0.02–0.04dB at around –60dB and around 0.04–0.06dB down around –90dB.

Over­all wide­band sig­nal-to-noise ra­tios were very good, as you can see from the tab­u­lated fig­ures, with Newport Test Labs mea­sur­ing 97dB un­weighted, im­prov­ing to 107dB A-weighted us­ing CD stan­dard sig­nals, and 114dB CCIR-RMS weighted when us­ing 24-bit/48kHz (AES) test sig­nals.

Power con­sump­tion was mea­sured at 16.98-watts when the unit was op­er­at­ing and at 3.42-watts when it was in standby. This slightly higher-than-usual standby con­sump­tion sug­gests that de­spite be­ing in standby, wi-fi and Blue­tooth are still op­er­a­tional so the unit can be ‘wo­ken up’ re­motely. Although this is ob­vi­ously very low power con­sump­tion, it does mean you should turn the unit off com­pletely when you won’t be us­ing it for long pe­ri­ods of time.

Su­perb per­for­mance all-round from the Marantz NA 6005. Steve Hold­ing

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