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Reviewer: Srajan Ebaen
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Main system: Sources: Retina 5K 27" iMac (4GHz quad-core with Turbo, 32GB RAM, 3TB FusionDrive, OSX Yosemite. iTunes 14.4), PureMusic 3.02, Audirvana 3, Qobuz, Tidal, Singxer SU-6 USB bridge, Sonnet Pasithea DAC; Active filter: icOn 80Hz/4th-order hi/lo-pass; Power amplifiers: Kinki Studio EX-B7 mono, Enleum AMP-23R; Headamp: Kinki Studio THR-1, Cen.Grand Silver Fox; Phones: HifiMan Susvara; Loudspeakers: sound|kaos Vox 3awf + sound|kaos DSUB15 on Carbide Audio footers, Audio Physic Codex, Cube Audio Nenuphar Cables: Complete loom of Allnic Audio ZL; Power delivery: Vibex Granada/Alhambra on all source components, Vibex One 11R on amps, Furutech DPS-4.1 between wall and conditioners; Equipment rack: Artesanía Audio Exoteryc double-wide 3-tier with optional glass shelves, Exoteryc Krion and glass amp stands; Sundry accessories: Acoustic System resonators, LessLoss Firewall for loudspeakers, Furutech NCF Signal Boosters; Room: 6 x 8m with open door behind listening seat
2nd system: Source: Soundaware D300Ref SD transport clock-slaved to Denafrips Terminator +; Preamp/filter: icOn 4Pro SE; Amplifier: Goldmund Job 225; Loudspeakers: MonAcoustic SuperMon Mini or Acelec Model One + Dynaudio S18 sub; Power delivery: Furutech GTO 2D NCF; Equipment rack: Hifistay Mythology Transform X-Frame [on extended loan]; Sundry accessories: Audioquest Fog Lifters; Furutech NFC Clear Lines; Room: ~3.5 x 8m
Desktop system: Source: HP Z230 work station Win10/64; USB bridge: Singxer SU-2; Headamp/DAC: iFi iDSD Pro Signature; Headphones: Final D-8000; Active speakers: DMAX SC5
Upstairs headfi/speaker system: Source: smsl Dp5 transport; DAC: Auralic Vega; Integrated amplifier: Schiit Jotunheim R; Phones: Raal-Requisite SR1a; Active DSP speakers: Fram Midi 120
2-channel video system: Source: Oppo BDP-105; All-in-One: Gold Note IS-1000 Deluxe; Loudspeakers: Zu Soul VI; Subwoofer: Zu Submission; Power delivery: Furutech eTP-8, Room: ~6x4m
Review component retail: £4'000/pr monos, £2'499 headfi amp
Gran Turismo or God's Toy? God boasts truly limitless funds. You and I don't. So not that. Gran Turismo is just a video game. Here we only do audio. So not that either. What then is the GT suffix of Burson's triple X-rated kit? Grand Tourer. To take the mono amp's grand tour, it's a DC-coupled 110/180w into 8/4Ω class A/B affair biased into high 30-watt class A. One look at the sleek compact case and canny cognoscenti call out bullish braggadocio. No way, José! Those more curious and less convinced of their own omniscience dig deeper.
This learns of a switching power supply which already LinnenberG and Aavik combine successfully with pure class A in push/pull. Switching power eliminates a hulking, heavy, costly and noisy 50/60Hz power transformer. Say sayonara too to the usual armada of big filter capacitors. Burson's external 60kHz 210-watt 'Super Charger' which converts AC to low-Ω DC still sees two of their Max Current Power supplies inside the case. Those 'upsample' power switching to a heady 170kHz. That's in the bat sphere. Houston where art thou? Higher speed decommissions slow-charging fat caps. Smaller ones which are far quicker to replenish suffice. But let's not forget that the amp draws 100 idle watts regardless. It's not class A/B in mostly B.
So its associated three pairs of push/pull power transistors still want to turn on the sauna. To keep their elegantly finned 6mm case cool, our Aussies have installed an Austrian hi-zoot fan to suck in cool air and push hot air out. They claim just 25dB of whir so below the 30dB noise floor of a quiet normal room. Then they give us red-anodized brackets to stand each amp upright for even more cooling; and throw in 30/55W into 8/4Ω low power levels with 29dB of voltage gain so we needn't waste what we don't use. Naturally the external wall 'charger' is voltage agnostic to work on anything between 100 and 240VAC. Have amps, will travel.
Given dual monotheism, high power relative to marginal real estate especially upright; and not flying class D in the cheap seats… €4K/pair remains competitive even if brand cachet doesn't hit as hard as Gryphon or Pass.
Early 2012 version | final 2013 version of Timekeeper with then still linear power supply.
For an apples-to-apples comparison of linear vs. switching power supplies, here's a Neurochrome amp which can be ordered either way. Everything else is identical. Only the power supplies differ. It's easy to appreciate how the right version would easily fit into a smaller chassis.
The particular external 32V/6.5A PSU associated with the Timekeeper 3XGT is specific to this model. Less potent 24V/5A or 24V/3A versions go on other Burson kit; or even competitors whose voltages match. Swappable heads shake pins with different wall sockets.
S'all good, man. No need to call a hifi attorney to decipher the small print. When powering these up, you won't trip a circuit breaker due to extreme in-rush current. When installing these, cancel the booking with the chiropractor and your heave-ho buddy. UPS won't curse after ringing the bell. You won't need two shelves in a rack either. And if you fancy keeping your friends close, your speakers closer, setting these upright next/behind them is readily doable.
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