Adcom GFP 555 II Preamp and GFA 545 II Power Amp Reviewed
- By: Ken Kessler
- - Reviewer's System
- Resources & Links:
- Adcom ,
- View Ken Kessler's Reviews
- February 14, 1992
Marvelling at the lack of speed which afflicts this industry, I'm pleased to note that -- at last -- Adcom has made it to the UK. No, I'm not wearing my Stars'n'Stripes necktie, but I do admit to above-average curiosity. After all, this brand is a market leader in the States, kicking serious tush in the sector best described as 'entry level high end'. Knowing about it mainly from the a heavy ad campaign and a run of rave reviews, I find that Adcom ought to have special appeal for the British audiophile: it's imported yet not expensive.
Sadly, though, for Adcom, it suffers not so much from the inevitable if slight price hikes as it wings its way across the Atlantic but from something unique to all imports into the UK. Even with sympathetic pricing, the Adcom -- while not entirely losing its bargain appeal -- has to compete with the toughest of our home-grown defenders in an area where the British excel: mid-priced separates from the likes of Exposure, Mission, Musical Fidelity, Audiolab, Arcam and every other audiophilic manufacturer which aims its wares at the hobbyist. And the British have had this market almost completely to themselves because the only other sources for cost-effective separates (Japan and the USA) have failed on either of two counts: lousy pricing or lousy sound. Aside from the presence of Hafler and PS Audio, the Yanks are barely represented in the UK at the sub-£1000 pre/power combination price point.
Adcom's GFP 555 II pre-amp and GFA 545 II power amp cost £499 each, for a combined price just £2 below the four-figure mark. And that tariff will pay for all manner of worthwhile British-made alternatives. But, immediately, you notice something about the Adcom combo which cannot be matched by British brands: it looks like high-end hardware. Most of the British, for whatever reason, continue to make gear which looks like -- let's just say that it's iconoclastic, which is noble if somewhat stupid. It limits the appeal mainly to British consumers who stubbornly encourage non-standard panel widths, unique colours and everything else which makes hi-fi mix'n'match an aesthetic nightmare. Adcom gives entry level buyers the look of pukka top-end gear, however boring the idea of a jet-black, 430mm fascia may seem.
The GFP 555 II pre-amp commits its first sin by including such anti-purist facilties as tone controls, a headphone socket, subsonic filter and tone contour, but it hastily makes amends by providing both a tone defeat and a second set of main outputs which bypass the tone and filter controls as well as the protection of the coupling capacitors. The sonic gains are obvious, so I did all of my listening with the amp connected to the bypass sockets. The pre-amplifier sounds dark, soft and thin when you feed a signal through all of the non-essential circutry.
The front panel is, indeed, loaded. At the extreme left is an on/off rocker and a power-on LED, the headphone socket (the 'phones run off a separate internal amplifier), balance, bass and treble rotary controls, tone defeat, contour (loudness), low filter, mono and external processor buttons, two rotary source selectors for play and record and volume control. At the back, the Adcom features gold sockets for phono (47k ohm/100pf), three line sources, two tape decks in both directions, the external processor and normal and bypassed outputs. Also on the back are an earthing post and a mains fuse.
The GFP 555 II uses a low-impedance power supply with enlarged traces on the double-layer PCB for minimal loss and improved stability. The power transformer is mu-metal shielded, so the sound is hum- and buzz-free. All capacitors are metallized electrolytics while the resistors are 1% Roederstein metal film types; so much for low prices precluding the use of designer components. The signal path amplifier uses premium grade ICs chosen for low noise, low distortion and low DC offset. All stages operate in Class-A and the entire signal path is direct-coupled when the pre-amp is operated in the bypass mode. The phono amp has been optimized for m-m and high-output m-cs; I tested it using Deccas, high-output Audio-Technicas and a Koetsu and found it adequate if not thrilling. This pre-amp is definitely a product of the line-level-sources era.
Operationally, the Adcom made me think 'Japanese', and that's meant as a compliment. No drama, everything worked as it should -- I'd forgotten what it was like to just flick a switch without shielding my eyes from debris or my ears from bangs and pops. Am I getting older or something?
Ditto for the power amplifier. After a few recent disasters, scale models of the bombing of Dresden, I've approached amplifier switch-on with dread. The Adcom? Not so much as a 'click', other than the mechanical sound of the rocker switch engaging. Again, this is hi-fi-as-appliance: A black box, ennui relief in the form of a grooved section on the upper half of the fascia, an on/off switch and LED indicator, a brace of multi-way binding posts and gold-plated inputs. Oh, and a mains fuse. The only other distinguishing characteristics are three warning lights, two for 'instantaneous distortion alert' to warn you of excessive THD, IM, slew-induced distortion or clipping, and a light to indicate the awakening of the thermal protection circuit. Even beating the crap out of this amp with some tough loads, I couldn't get the lights to flicker once. Which surprised me, because this amplifier -- though rated at 100W/channel into 8 ohms -- doesn't come across like a real piledriver. Even the literature mentions its suitability for non-headbanging conditions
Adcom's middle-of-the-range amp uses a Triple Darlington output stage, a large potted toroidal transformer and large, high-grade power supply filter capacitors to provide stability with awkward loads. While it didn't exactly make the Sonus Faber Extremas sing, neither did it pop its corks. There are no electrolytic caps in the low-frequency signal path or feedback loop path, with the only caps used in the circuit being precision non-polarized types. A servo circuit minimizes DC-offset at the outputs. Large heat sinks and adequate ventilation kept this cool at all times, even when the unit was attached to Apogee Stages. The output section contains 12 discrete transistors, and I'm assuming Class AB operation.
Time and again you're reminded that this is a middle-weight, mid-priced, mid-everything set-up. Despite lip service to the audiophile sector, the Adcom devices are too user-friendly, too tweak-free to frighten off non-hobbyists. If you look at the globe with the Japanese at one extreme and the British at the other, this American offering rests firmly in the middle. And not just in terms of ergonomics or perceived value but sonically as well.
If the characteristic British sound is one of coherence, top-to-bottom consistency and detail, with the Japanese sound being punchy but thin, bright and 'hi-fi', then this pairing provides a perfect compromise. More than competent but almost dismissive of subtlety, the Adcom sounds like a half-scale behemoth. While lacking the slam and sheer drive of the big Yank offerings, it does have more (subjective) kick than most British offerings, whatever palaver they may make about their Herculean power supplies. The Adcom is never ruffled. It merely knows its limitations. It will not ape 300W' worth of Krell or Levinson. Neither does it sound like a NAD3020 wishing it only had to drive headphones.
But there is, despite its feature-laden facade, a real sense of 'audiophile'. In other words, it makes all the right noises, with competence in certain areas -- of which the mass-market audience is ignorant but the hobbyist sector deems essential.
Using CD as a source and playing the Adcom through Linaeum LFXes or Rogers LS3/5As at 'sane' levels, it emerged that this amplifier enjoys great synergy with speakers which don't tax its lower registers and which possess stunning imaging capabilities. At no point do these speakers demand too much of the Adcom; allowed to all but 'idle', the GFA 555 II is a relaxed, relaxing performer which can handle quite large dynamic swings. It's quick without being breathtaking, and it's detailed without sounding over-etched. Juggling these qualities, you find that it's too 'musical' to be mistaken for any Oriental wares other than certain Marantz, Pioneer and Rotel units subject to known reviewer adulation. Conversely, it's too lively to be mistaken for a po-faced Britbrick concerned more with politeness than partying.
But it does have a 'personality'. The smooth, controlled sound stops just short of dullness, as if the designer consciously avoided exciting any tizz which could be mistaken for dialled-in hi-fi SFX. In this respect it does show a touch of Britishness. But the sound is, at times, too light, if not exactly washed out and thin. The lower registers have slam, power and control, but -- as shown by the Apogee Stages and the WATT/Puppy combination -- the real action is in the mid-to-upper bass, with the bottom octaves sounding drier and less visceral.
Which makes the Adcom a perfect match for smaller rather than larger speakers, but this is a byproduct of the sonic nature rather than the power delivery. Even so, this shouldn't present too much of a problem for British Adcom dealers because, conceptually, the products are far removed from the hair-shirt, circa '79 mentality of most of the British competitors. The Adcom products will appeal mainly to Krell/Levinson wannabees. They provide high-end karma at sensible prices, performance which must be taken seriously, benevolent ergonomics and perceived value which continues to elude the head-in-the-sand British makes. Then again, the looks alone will ensure that the Adcom never has to face off against its British rivals. I can only think of one range which would give the Adcom a hard time and that's Acurus. Which, fortunately for Adcom, isn't available inthe UK.
Does the Adcom package represent good value in the UK? Yes, but only if you can't bear the thought of giving shelf-space to ugly, unreliable, gutless, masochistic products aimed at xenophobes. Which means that you're part of the 99.999999999% of the world's population.
Keywords
Adcom GFP 555 II Preamp and GFA 545 II Power Amp Reviewed
- Audiovalve Baldur 70 Amplifier...
- Ayre AX-7 Power Amp Reviewed...
- EAT Valves Reviewed...
- Musical Fidelity X-Pre Preamp ...
- Sonus faber Gravis Subwoofer r...
- WAVAC Amp Reviewed ...
- AMC CVT 3030 Integrated Amp Rev...
- AMC CVT 3030 Tube Integrated Am...
- Adcom GFP 555 II Preamp and GFA...
- Air Tight ATC-1 Preamp and ATM-...
- Arion Nemisis Power Amp Reviewe...
- Armonia Integrated Amp reviewed...
- Audio Analogue Maestro Settana ...
- Audio Note Conquest Amp Reviewe...
- Audio Note Gaku-On Monoblock Po...
- Audio Research CA-50 Integrated...
- Audio Research Reference 600 Po...
- Audio Research VS55 Power Amp R...
- Audio Research VSi55 Integrated...
- Beam Echo Tube Amp Reviewed...
- Beard Audio BB100 Tube Power Am...
- Cadence PRE2 Preamp and MA2 Pow...
- Carver Silver Seven Mono Vacuum...
- Cello Audio Palette, Performanc...
- Classe DR-5 Preamp and DR-5 Pow...
- Classe Thirty Preamp and the Se...
- Conuterpoint SA-1000 Preamp and...
- Copland CSA 29 Integrated Amp R...
- Copland CSA14 integrated amplif...
- Copland CTA 401 Integrated Ampl...
- Counterpoint SA-12 Power Amp Re...
- Croft Series 3 Power Amplifier ...
- Croft Series V Power Amplifier ...
- Croft Series V-C Amp reviewed...
- Dynaco Stereo 70 Tube Amp Revie...
- EAR Paravicini M100A/312 Tube A...
- EAR V-20 Amp Reviewed...
- Einstein Power Amp Review...
- Esoteric Audio Research (E.A.R....
- Fase Nimis Integrated Amp Revie...
- GRAAF GM20 Power Amp Reviewed...
- Graff GM 200 Amplifier Reviewed...
- Graff GM50B Integrated Amp Revi...
- Gryphon Callisto 2200 Integrate...
- Gryphon Callisto 2200 Integrate...
- Gryphon DM100 Dual Mono Amplifi...
- Halcro dm58 Monoblock Amp Revie...
- Jadis JPS8 Preamp and JA50 Powe...
- Krell KAV-250a and KAV-250p Rev...
- Krell KAV-300i Integrated Amp r...
- Krell MD-20 CD Transport, Krell...
- LOTH-X JI-300 Amp Reviewed...
- Lecson Quattra Integrated Amp R...
- Linn Classik Movie System with ...
- Marantz Model 7 Reviewed...
- Marantz PM54 SE Integrated Ampl...
- Marantz SC-7S1 Preamp and MA-9S...
- McIntosh MA6900 Integrated Amp ...
- McIntosh MC 275 Power Amp Revie...
- McIntosh MC2000 Power Amp Revie...
- Metaxas Opulence Preamp and Sol...
- Metaxas Solitaire Power Amp and...
- Musical Fidelity F-Series Power...
- Musical Fidelity Nu-Vista M3 In...
- Musical Fidelity Tri-Vista 300 ...
- Musical Fidelity X-Ray Integrat...
- Musical Fidelity kW750 Preamp R...
- NVA AP10 Integrated Amp Review...
- NVA AP50 Amp Reviewed...
- Nagra VPA Amplifier Reviewed...
- Niro (Nakamichi) 1000 Integrate...
- Pathos Twin Tower Amps Reviewed...
- Pink Triangle Inergral Integrat...
- Primaluna Prologue One Integrat...
- Primaluna Prologue Two Amplifie...
- Quad 33 Preamp and 303 Amp Revi...
- Radford MA50 Renaissance Class-...
- Red Rose Music Model 5 Integrat...
- Red Rose Music Rosette 1 Integr...
- Sim Audio Moon Integrated Amp R...
- Sinfonia Preamp and Amp Reviewe...
- Solen Tiger Tube/MOSFET Integra...
- Sonic Frontiers SFS-50 Tube Pow...
- Sudgen A21 Amp Reviewed...
- Sugden Masterclass Preamp and M...
- T+A K6 Integrated Amp and Compa...
- T+A V-10 Amplifier Reviewed ...
- Tag McLaren DVD32FLR DVD-Video ...
- Theta Dreadnaught Amp reviewed...
- Trilogy RC211 Power Amps Review...
- Trilogy Vti Integrated Amp Revi...
- Unison Research Power Amp Revie...
- Unison Research SR1 Tube Amp Re...
- Unison Research Simply 845 Inte...
- Valfet Audio Power Amplifier Re...
Featured Audio-Video News
Experiencing Your Dream Home Theater While On Vacation -
It isn't any news that the economy is in the dumps. Morphing your living room, garage or basement into the...
Latest Stereo Amplifier Reviews (Classic)
AMC CVT 3030 Integrated Amp Reviewed -
Name the best-selling 'audiophile' budget integrated amplifier of all time. The NAD 3020, right? Even if it isn't -- I wouldn't be surprised if it was outsold by some piece of junk from one of the Japanese majors, but I... Click for more...
Beam Echo Tube Amp Reviewed -
Elder tubies delighted with the news that the name 'Beam-Echo' has been revived need wait no longer for proof. The reincarnated constructor has re-issued the Avantic DL7-35 monoblock power amp as its debut product, marking the amplifier's 40th anniversary,... Click for more...
NVA AP50 Amp Reviewed -
How refreshing it is to see, amidst a plethora of amps so cluttered as to be rococo, a return to good old-fashioned British minimalism. Not that NVA is completely innocent of the charge of producing what in the world of... Click for more...
Krell KAV-300i Integrated Amp reviewed -
Classroom doodling, playing the Lottery - whatever forms of dreaming take your fancy, there are some fantasies you're too realistic to entertain. And not just because Ferrari has already signed this year's drivers. I mean: who'd've thought that Dan D'Agostino... Click for more...
Audio Note Conquest Amp Reviewed -
Heh, heh...I can picture at least half of you going, "Oh, no - here come more toys with prices courtesy of L. Frank Baum." Close, but no (Monte Cristo) cigar: there are ranges in the Audio Note catalogue, the models... Click for more...
Audio Research Reference 600 Power Amps Reviewed -
Don't kid yourself: reviewers get nervous, too. At least this one does whenever he has to review a product which has the potential to rewrite the rules. Hell, the latest from Bill Johnson doesn't just rewrite 'em: he's thrown... Click for more...
NVA AP10 Integrated Amp Review -
It was never Richard Dunn's intention to set me on a chase to find the cheapest tolerable mock-audiophile system one could muster. But he did submit for review the NVA AP10 single-input amplifier selling for a paltry £160 and decided... Click for more...
Marantz Model 7 Reviewed -
Twist my arm. Go on. me to review a couple of products I've been dreaming about owning for years. What's that? If I've actually been waiting for 'years', did I suddenly find some mint originals? Not quite: Marantz took it... Click for more...
Arion Nemisis Power Amp Reviewed -
In a remarkably short time, the world of single-ended triode amplification has created its own set of niches. Calling it a 'hierarchy' would suggest some sort of pecking order - and I'd rather not be so egotistical as to assume... Click for more...
Krell KAV-250a and KAV-250p Reviewed -
What signals are you receiving from Krell? What do you make of the turnaround that has produced so much prime entry-level gear? Let's not be too glib about this, for even the Krell components we're about to explore sell for... Click for more...
Latest Stereo Amplifier Reviews (Classic)
AMC CVT 3030 Integrated Amp Reviewed -
Name the best-selling 'audiophile' budget integrated amplifier of all time. The NAD 3020, right? Even if it isn't -- I wouldn't be surprised if it was outsold by some piece of junk from one of the Japanese majors, but I... Click for more...
Beam Echo Tube Amp Reviewed -
Elder tubies delighted with the news that the name 'Beam-Echo' has been revived need wait no longer for proof. The reincarnated constructor has re-issued the Avantic DL7-35 monoblock power amp as its debut product, marking the amplifier's 40th anniversary,... Click for more...
NVA AP50 Amp Reviewed -
How refreshing it is to see, amidst a plethora of amps so cluttered as to be rococo, a return to good old-fashioned British minimalism. Not that NVA is completely innocent of the charge of producing what in the world of... Click for more...
Krell KAV-300i Integrated Amp reviewed -
Classroom doodling, playing the Lottery - whatever forms of dreaming take your fancy, there are some fantasies you're too realistic to entertain. And not just because Ferrari has already signed this year's drivers. I mean: who'd've thought that Dan D'Agostino... Click for more...
Audio Note Conquest Amp Reviewed -
Heh, heh...I can picture at least half of you going, "Oh, no - here come more toys with prices courtesy of L. Frank Baum." Close, but no (Monte Cristo) cigar: there are ranges in the Audio Note catalogue, the models... Click for more...
Audio Research Reference 600 Power Amps Reviewed -
Don't kid yourself: reviewers get nervous, too. At least this one does whenever he has to review a product which has the potential to rewrite the rules. Hell, the latest from Bill Johnson doesn't just rewrite 'em: he's thrown... Click for more...
NVA AP10 Integrated Amp Review -
It was never Richard Dunn's intention to set me on a chase to find the cheapest tolerable mock-audiophile system one could muster. But he did submit for review the NVA AP10 single-input amplifier selling for a paltry £160 and decided... Click for more...
Marantz Model 7 Reviewed -
Twist my arm. Go on. me to review a couple of products I've been dreaming about owning for years. What's that? If I've actually been waiting for 'years', did I suddenly find some mint originals? Not quite: Marantz took it... Click for more...
Arion Nemisis Power Amp Reviewed -
In a remarkably short time, the world of single-ended triode amplification has created its own set of niches. Calling it a 'hierarchy' would suggest some sort of pecking order - and I'd rather not be so egotistical as to assume... Click for more...
Krell KAV-250a and KAV-250p Reviewed -
What signals are you receiving from Krell? What do you make of the turnaround that has produced so much prime entry-level gear? Let's not be too glib about this, for even the Krell components we're about to explore sell for... Click for more...
Latest Equipment Reviews
Mapleshade Time-Correcting Maple Bedrock Speaker Stands Reviewed -
For ages the adage with bookshelf and/or monitor speakers has always been getting the tweeter or tweeter/midrange as close to ear height will yield the best results. Of course proper placement in a room as well as in relation to... Click for more...
Mapleshade Samson V.1 Equipment Rack Reviewed -
Seemingly everyone makes an equipment rack of some form or another these days with varying degrees of success, however for best results you're better off going with a third party or specialty equipment rack. The problem with going with an... Click for more...
Oppo BDP-83 Special Edition Universal Player Reviewed -
Oppo Digital's first Blu-ray player the BDP-83 entered the market in mid 2009 to numerous accolades. A mere half year later, Oppo Digital, not satisfied with the untapped performance potential of the player, released the BDP-83 Special Edition reviewed here.... Click for more...
Parker Audio 95MK II Loudspeakers Reviewed -
Chances are you've never heard of or seen a pair of Parker Audio 95MK II loudspeakers. Because of that fact, you're probably thinking they're some sort of uber-esoteric, high-end, ultra-expensive loudspeakers from some designer's garage in Munich. Well, you'd be... Click for more...
Bel Canto e. One S300iu Integrated Amplifier Reviewed -
Integrated amplifiers have always been an effective and affordable way to get into two-channel audio. However, in recent years, integrated amplifiers have come into their own, offering performance and simplicity that even high-end separate systems have trouble matching. Case in... Click for more...
Bel Canto e.One S300 Power Amplifier Reviewed -
Stereo amplifiers have been a staple since music went from single speakers to two-way back in the day. Over the years, we've seen stereo amplifiers go from simple, manageable black boxes to over-the-top, larger-than-thou space heaters for the home and... Click for more...
OmniMount Link Series A/V Stands Reviewed -
As its name suggests, OmniMount's Link Series is a modular line of A/V stands that you can mix and match to craft the exact entertainment solution you need. You can also add on as your system grows. The Link Series,... Click for more...
Paradigm Reference Studio 20 v.5 Bookshelf Speaker Reviewed -
I've been a fan of Paradigm for years, owning and enjoying seemingly every speaker in their product line from the awesome and affordable Atoms to their flagship Signature S8s. Over the years there have been two Paradigm speaker designs that... Click for more...
Bel Canto REF 1000M Mono Amplifier Reviewed -
When one thinks of a 500-Watt mono amplifier you probably picture a large, heat sink clad hunk of steel that weighs more than the car you drove it home in and probably costs more too. What if I told you... Click for more...
OmniMount VideoBasics TV Mounts Reviewed -
You've spent the extra money to buy an ultra-thin HDTV. The last thing you want to do is hinder the minimalist look by mating the TV with a bulky wall-mount. OmniMount designed the VideoBasics line of flat-panel TV mounts with... Click for more...





Comment on this article
0Post a Comment