Lab­o­ra­tory test re­port

Australian HIFI - - LAB REPORT -

New­port Test Labs mea­sured the au­dio-band fre­quency re­sponse of the Para­sound JC 3 Jnr as 20Hz to 20kHz ±0.2dB, which is ex­actly as spec­i­fied by Para­sound, and is shown in the ac­com­pa­ny­ing Graph 1.

You can see from the graph that the re­sponse has a very slight boost at low fre­quen­cies (peak­ing at around +0.2dB at 40Hz) then slowly rolling off to to 1kHz, af­ter which there’s an even smaller boost in the re­sponse that ‘peaks’ at 8kHz, be­fore rolling off to 20kHz. The re­sponse is cer­tainly wide­band, be­ing 3dB down at 8Hz and at ref­er­ence level out to 100kHz.

Chan­nel sepa­ra­tion was out­stand­ing, with New­port Test Labs mea­sur­ing a best re­sult of 101dB at 1kHz, but it was still at or bet­ter than 93dB at 16Hz and 20kHz, as you can see from the tab­u­lated fig­ures. Chan­nel bal­ance was su­perb, at 0.009dB.

To­tal har­monic dis­tor­tion was mea­sured as 0.01%, and you can see the dis­tor­tion spec­trum in Graph 2. The se­cond har­monic dis­tor­tion com­po­nent is at –100dB (0.001%), the third at –109dB (0.0003%), the fourth at –115dB (0.00017%), the fifth at –120dB (0.0001%) and the sixth at –128dB (0.00003%). Ob­vi­ously this is a very clean, al­most dis­tor­tion-free am­pli­fier.

Sig­nal-to-noise ra­tio was mea­sured at 73dB A-weighted, ref­er­enced to an out­put of 500mV out (with a 5mV in­put re­quired to de­liver this out­put). This was mea­sured us­ing the un­bal­anced out­puts, so the bal­anced out­puts will re­turn even bet­ter fig­ures. This fig­ure is slightly lower than Para­sound’s spec­i­fi­ca­tion of 85dB A-weighted, so I can only as­sume Para­sound used a higher in­put volt­age (and thus ended up with a higher out­put volt­age) which will al­ways re­sult in a higher S/N ra­tio.

Gain was mea­sured for all three gain set­tings, us­ing the un­bal­anced out­put and, as you can see from the tab­u­lated fig­ures, was ex­actly 60dB at 60dB as claimed by Para­sound, and very close at the other set­tings, with New­port Test Labs mea­sur­ing gain for the 40dB set­ting as 40.91dB, and for the 50dB set­ting as 50.45dB.

In­put sen­si­tiv­ity for a 1 volt out­put was 9.0mV at the 40dB gain set­ting, 3.0mV at the 50dB set­ting and 1.0mV at the 60dB gain set­ting. The in­put over­load mar­gin was an ex­cep­tion­ally good 24dB.

Power con­sump­tion was a miserly 9.63-watts, so leav­ing the Para­sound JC 3 Jnr on all the time is not go­ing to im­pact on your power bills, but if you go green (and I think you should) and switch to stand-by when you’re not us­ing it, it will con­sume just 0.66-watts, which is next to noth­ing, but still a tad over the 0.5-watt con­sump­tion tar­get the Aus­tralian govern­ment will soon man­date.

Over­all, the Para­sound JC 3 Jnr re­turned out­stand­ing per­for­mance on New­port Test Labs’ test bench. Steve Hold­ing

Chan­nel sepa­ra­tion was out­stand­ing, with New­port Test Labs mea­sur­ing a best re­sult of 101dB at 1kHz

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