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Caddock MP821: 53% The MP821 delivered an above average sound with positive dynamic expression detail and transparency, but was held back by a degree of added brightness which emphasised any sibilance and treble distortion, if present. It sounded a little ¡®busy¡¯, leading to a divided opinion. CGS Meggitt: 46% This resistor had a characteristic ceramic wire-wound sound, with roughness, brightness and grit, but also showed better clarity and rhythm than is usual for the type (perhaps the consequence of a mild increase in loudness). Duelund CAST: 79% ¡°Did not sound like a resistor¡±, the CAST sounded neutral, transparent, free from audible distortion or emphasis, with excellent clarity and detail, good plus dynamics, and very good rhythm. The non-CAST construction Duelunds at half the price will clearly be also worth trying despite (or because of ) their negative temperature coefficient, which is claimed to compensate to some degree for medium term compression due to voice coil heating. (For this to work properly, the two time constants would need to be matched, which seems unlikely.) KNP (WW): 45% The sound is reasonably well balanced, with some ¡®wiry¡¯ and boxy coloration, slower bass, and moderate sibilance excess. It¡¯s a typical industry result. Monacor Ceramic (WW): 40% The Monacor Ceramic had poorer depth, dynamics and detail than average plus some sibilant emphasis, and generally seemed less involving and musically interesting. Mundorf MResist SUPREME (bi-filar WW): 64% Mundorf ¡¯s MResist SUPREME showed some extra brilliance and slight ¡®ringing¡¯, but dynamics and clarity were well preserved, nicely expressive and transparent, with low subjective distortion, and above average rhythmic integrity. Mundorf MOX 10W: 51% This resistor gave a well balanced performance: not objectionable, if a little bland musically, but with good neutrality and image depth. Mundorf MOX 5W: 60% This 5W MOX resistor sounded rather like the 10W version, but was clearly more interesting and involving musically, more open and transparent, and with better subjective rhythmic performance. Perversely, science would tend to predict the reverse in this comparison. Mundorf WW ceramic 25W: 43 % (mid only test) The sound here was not so relaxed with some added moderate sibilance, loss of clarity and focus, with rougher treble sounds. Vishay Sfernice RCH25 series : 42% This Vishay is a mysterious sounding design. It¡¯s quite neutral and accurate, but lacks dynamics and interest, so it¡¯s inexplicably rather bland and uninvolving, leading to poorer sense of rhythm and a loss of transparency. Welwyn W24 : 36% This well established vitreous coated ¡®oldie¡¯ seems to be betrayed by its copper-steel lead-outs, and has a dulled, uninvolving sound that masks detail and impact, resulting in a below average score.
CONCLUSIONS While it¡¯s true to say that we were using a very high quality test platform, the differences we heard were greater than expected and led to clear preferences. Duelund¡¯s mythic reputation was upheld: its products really do seem to provide the required attenuation without significantly disturbing the music quality. (Close tolerance to order.) While slightly coloured, Mundorf ¡¯s MResist also justified its reputation, this high specification component holding musical values essentially intact thanks to exceptional build quality. One surprise was the higher ranking of the 5W Mundorf MOX over their 10W example, but it was also clear that these two were of different construction, and both are very good value. The Caddock MP series film sounded familiar, as it should, and certainly had hi-fi credentials, but was not the test favourite. Close tolerance values are available for this precision resistor. Industry generic ceramic wire-wounds do the job but are unremarkable, with some added subjective distortions, while the Welwyn W24 warhorse no longer figures. Found to be rather self-effacing, Vishay¡¯s Sfernice oxide film type was quite neutral but musically rather bland.
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