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发表于 2008-12-14 20:22:56
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jonclancy的评论:
Novo Review Part One
OUT-OF-THE-BOX
The Graham Slee Enteos Series Novo Discrete Solid State Amplifier is housed in an extruded aluminium case measuring approx 10cm x 10cm x 5cm. Initial impressions – Black aluminium volume knob is nicely finished. Overall case fit is very good, but finish on front and back panel edges could be improved. This is a beta model, so perhaps the edge finish on the production model will be improved. I’d like to see ink-filled engraving rather than silkscreen on the front panel, but the market will probably not allow this, as the extra cost would push the price in excess of £230 plus VAT, and this is an entry level model, after all. Silkscreen printing is nice and accurate.
The quality of the aluminium extrusion is, however, excellent, and I especially like the use of flush-fitting hex-head screws on the case. The quality of the RCA sockets on the back panel appears to be very good, too. The Novo features a chain-through circuit that makes integrating it into your system a doddle.
Power supply is a small, switched-mode, wall-plug unit in black plastic. Multi-voltage in and 24VDC output. The lightweight unit comes with a selection of international plug adaptors, which is superb as the Novo is certainly small enough to take with you on trips. I’d like to try the Novo with a linear PSU, and have a standard 7824-based regulated supply I will try later.
The Novo instruction sheet is very comprehensive.
Overall out-of-the-box impression is pretty good!
UNDER THE BONNET
Next step is opening up the unit for a nose under the bonnet. Inside is a very tidy PCB with excellent build quality and premium components. Attention to detail bodes well for the listening tests. Because of the nature of the beast, some PCB tracks are necessarily long – however, if the PCB was used as a drop-in upgrade board for an op amp based CDP headphone output (or in a pre-amp – or AS a pre????), then these tracks could be shortened considerably. Hopefully, Graham will be offering the PCB only through diyaudiokits. While having a poke around, I noticed that Q3a andQ4a, Q3b and Q4b appear to be thermally coupled, and perhaps could use a little more thermal grease and a cable tie? Finally, I measured PD between the casework and ground, to see if there was any SMPS tingle (or if I was imagining it). I had about 4.25VAC on the meter, and it was almost imperceptible to the touch.
Channel imbalance is evident with the volume pot turned all the way down, but this is corrected by the time the volume is in the 7 o’clock position. Depending on the source level, normal listening position is around the 9.30 to 11 o’clock position. So not an issue, but worth pointing out as initially thought a channel on my new DAC was faulty until I gave it some more Vees. With the source paused, and the volume pot turned up fully, there was virtually no hum at all – very, very quiet, and what was present was probably caused by our crappy mains here.
Overall, the Novo has a nice PCB, very clean, super layout, using good quality parts. This will be great for a kit, suitable as a first time project, and I think everyone building one will be very pleased with it indeed!
TUNES
All Review and Listening notes were made in real-time with a Dictaphone and then transcribed (ish) to the report. I started off listening to the Novo with Hugh Masekela’s “Hope”, Track 12, “Stimela (Coal Train)”. This is a very nice live recording that is recorded at a pretty low level, needing around 12 o’clock volume setting with the K701s, vice around 9.30 – 10 o’clock for my other test tracks. The joy of this track is the dynamic range, and the song has a couple of crescendos that would have lost impact had the recording been more heavily compressed.
I decided to start out trying two sets of cans – the K701s and also Sennheiser’s bang-for-buck PX100s. Transport duties were undertaken by my Philips CD960 (unmodded, with the battleship build CDM1 transport) and the numbers sent via HDXV coax (RCA to BNC) to my recently completed Pedja Rogic AYA Rev2.0c DAC (Vanilla TDA 1541A, trick powersupplies, re-clocking, custom-wound trafo). Analogue sent via Van Den Hul hybrid ICs to the Novo.
NOVO LISTENING TEST - MASEKELA
PX100 at 9.30.
Good bass weight and separation, and quite fast, but lacking the air in the recording. This results in a slightly enclosed sound. Mids are quite good, really. Not a particularly huge soundstage. Altogether not as if you’re actually there for a live performance, so pretty unexciting really. Kick drum carries a weight you can feel in your head, but not too much detail or timbre with the kick. The crescendo at 3:50 is a little harsh, but trumpet is pleasantly smooth., but without that rasp to the notes you get with good reproduction. The listening test was stopped there, because the PX100 were a limiting factor. As they are pretty new, with less than 5 hours on them, it’s clear they need running in.
AKG K701 at 11.30 o’clock
Much less bass weight, but the air!!!!! Drums have a timbre to them and speed / accuracy that is very, very good. Crescendos are not harsh. Sax sounds very nice, though not that full-bodied. Accuracy and detail much improved. Trumpet much, much better – you can hear the breath going through it as he plays and you can hear the vibration of his lips on the mouthpiece as he’s playing. Great instrumental separation. Guitars easily discernable in the mix. You can hear Masakela inhaling before starting to sing, his breath and the rasp in his voice. Tympanies at 8:00 have masses of timbre. Brilliant! At the end of the track, the ambience is there – you can feel the size of the room!!
SCHA LISTENING TEST
I decided to compare the Novo wih the op amp-based SCHA. Mine is modded to the Rock Grotto standard (give or take) and I’m using a TKD stepped attenuator for volume control. Input caps are 10uF Wimas and op amp s LM4562. I have a Teddy Reg and JLH PSRR fitted between HA and the PSU, and will try the PSRR by itself in later tests. The SCHA kit will be on your doorstem from Jaycar for £20 in stock form, and a fully build and modded version will cost around £60. With the TKD and TR the price is similar to the Novo.
Great stereo separation, almost too wide, but very detailed. Very good, nice bass weight, similar to Novo, and perhaps a little rolled-off on top. Smooth delivery. Perhaps a tiny bit less definition on the bass. Weight is there. A rounded, musical presentation. Nice air and echo on the trumpet – you hear the rasp, but it’s smoother. Ties in with the rolled off highs, but musical – very pleasurable. Perhaps the soundstage isn’t as wide as the Novo, but a “blacker” and creamy presentation. It’s certainly a more rounded delivery. Tympanies have the timbre and detail.
BACK TO NOVO at 4:07 – Trumpet Solo to end.
A little bit more air and separation. Different, but not necessarily better. Separation on the guitars is better, but might be the LM4562 in the SCHA, and I have decided this is the best of the OPA627 pair and stock 2132. AD826 sounded great, but had high DC offset. Novo is very detailed. You can hear the wavering in the repeated trumpet notes – vey good. Definitely better definition. Voices sound great. How would this be as a pre-amp????!!! Backing vocals readily discernable rather than being part of the whole picture. Timbre in the mix is easily discernable. Highs are not harsh, even at high volume. Very, very good.
SNEAKY PREVIEW - PATRICIA BARBER
Volume at 9.30 o’clock.
Very amazing timbre, good separation. For some reason, my eyes are sweating! This is very good! You can hear the bass sliding up the fretboard in the background on note decay. Piano sounds natural. Detail is fantastic. Wow, brilliant!
There is definitely a lot more air, separation and detail on the Novo.
More to come………….. |
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