Australian HIFI - - ON TEST -

Hegel rates the out­put of the H80 with an out­put of 75-watts per chan­nel, both chan­nels driven into 8Ω and this is ex­actly what New­port Test Labs mea­sured on its test bench, and it mea­sured this out­put right across the au­dio spec­trum from 20Hz to 20kHz. This is ob­vi­ously a good re­sult, but it’s also one that shows that Hegel has such con­fi­dence in its man­u­fac­tur­ing and qual­ity con­trol pro­ce­dures that it doesn’t feel the need to build a lit­tle ‘head­room’ into the spec­i­fi­ca­tion to cope with model-to-model vari­a­tions.

Hegel doesn’t spec­ify the H80’s out­put into 4Ω loads, but you can see from the tab­u­lated re­sults that New­port Test Labs mea­sured the out­put of the re­view sam­ple as 110-watts per chan­nel at 20Hz, 114-watts per chan­nel at 1kHz and 106-watts per chan­nel at 20kHz (all mea­sure­ments with both chan­nels driven). This isn’t even close to the re­sults I would have ex­pected to see (the­o­ret­i­cally an am­pli­fier will dou­ble its out­put when load re­sis­tance is halved) of around 150-watts per chan­nel. This in­di­cated to me that Hegel might be us­ing cur­rent-lim­it­ing cir­cuitry, which was proved when the lab tested the am­pli­fier into 2Ω loads, be­cause that cir­cuitry limited the Hegel H80’s out­put to 25-watts into 2Ω.

Dis­tor­tion at an out­put of one watt is shown in Graphs 1 and 2 into 8Ω and 4Ω loads re­spec­tively. You can see the Hegel H80’s dis­tor­tion was low with both load val­ues, but lower with the 8Ω load. Into 8Ω, the se­cond har­monic dis­tor­tion com­po­nent was at –92dB (0.0025%), the third at –100dB (0.001%), the fourth at –102dB (0.0007%), the fifth at –105dB (0.0005%), and the sixth at –109dB (0.0003%). Sev­enth, eighth and nine har­monic com­po­nents are vis­i­ble, but all are around –112dB (0.0002%).

Dis­tor­tion in­creased sig­nif­i­cantly at rated out­put into both 8Ω and 4Ω loads, as you can see from Graphs 3 and 4. In this case, dis­tor­tion into 4Ω is slightly lower be­cause New­port Test Labs tested at a power level of 75-watts, rather than the Hegel’s max­i­mum out­put level of 115-watts into 4Ω. Into 8Ω, the se­cond and third-or­der har­monic dis­tor­tion com­po­nents are at around –83dB (0.007%), then the even-or­der har­monic com­po­nents are at around –105dB (0.0005%) right across the au­dio spec­trum, and the odd-or­der har­monic com­po­nents are at around –95dB to –100dB (0.001%) out to the eighth har­monic, be­fore drop­ping be­low –100dB for the higher-or­der. It’s pretty ob­vi­ous that the Hegel H80 is op­er­at­ing at the limit of its abil­i­ties here, though the over­all THD+N is still only a very low 0.006%.

In­ter­mod­u­la­tion dis­tor­tion is shown in Graph 5. The first two side­bands at 19kHz and 20kHz are 85dB down (0.0056%) and the oth­ers more than 100dB down (0.001%) which is ex­cel­lent. The re­gen­er­ated sig­nal at 1kHz is at –88dB (0.0039%).

New­port Test Labs mea­sured the fre­quency re­sponse of the Hegel H80 into both a stan­dard non-in­duc­tive test load as well as into a load that sim­u­lates that of a two-way stand­mount loud­speaker and found the am­pli­fier’s re­sponse into both was ex­cep­tion­ally flat and ex­tended—6Hz to 112kHz ±0.5dB and 4Hz to 181kHz –3dB. That sec­tion of the fre­quency re­sponse ly­ing within the au­dio band is shown in Graph 6. You can see the re­sponse into the re­sis­tive load (black trace) tracks the

Readers in­ter­ested in a full tech­ni­cal ap­praisal of the per­for­mance of the Hegel H80 In­te­grated Am­pli­fier/DAC should con­tinue on and read the LAB­O­RA­TORY RE­PORT pub­lished on the fol­low­ing pages. Readers should note that the re­sults men­tioned in the re­port, tab­u­lated in per­for­mance charts and/or dis­played us­ing graphs and/ or photographs should be con­strued as ap­ply­ing only to the spe­cific sam­ple tested.

Power out­put: Sin­gle chan­nel and both channles driven into 8-ohm and 4-ohm non-in­duc­tive loads at 20Hz, 1kHz and 20kHz.

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