Product Description - Model 1701 100 Watt Power Amplifier

Ovation High Fidelity’s Model 1701 Current Mode Topology (CMT) Stereo Power Amplifier delivers superior imaging, exceptionally transparent mid/high frequency sonics and deep, extended bass performance thanks to a very large, low noise power supply.

Paul Rigby, respected audio industry journalist and equipment reviewer had this to say about the 1701 “First impression? The Model 1701 offered one of the most mature and confidant musical reproduction experiences I have had for quite a while from any amplifier under review. It was that good.”

Compact, superbly engineered and like all Ovation High Fidelity products, built to last, the Model 1701 was described by Jon Myles of HiFi World as sounding ‘confident and authoritative’. He also noted the Model 1701 produced ‘more air and space and [Julie Cruise’s] vocals were deliciously rendered through the Quad Z3’s . . . ‘

Richard Bowles, reviewing for HiFiWigwam, enthused about the Model 1701 where he wrote ‘ . . . transients are rendered beautifully; every bass note is instant and clean’ going on to further remark ‘ . . . enormous impact and clarity, despite sound pressure levels verging on the obscene. It feels effortless. ‘

One of the key design objectives was to ensure the Model 1701 was transparent, open and could reproduce the delicate high notes on cymbals, triangles and violins accurately to preserve the all-important imaging that makes for a realistic listening experience. However, accurate, wideband performance without the ability to drive dynamic loudspeaker loads can result in constrained, compressed sound.  So, the Model 1701 features a hefty output stage for a 100W amplifier and a very large power supply. It will drive difficult loudspeakers with ease, and importantly, the distortion is flat not only across most of the audio bandwidth, but also across a widely varying loudspeaker load. And, each channel of the 1701 has its own large heatsink, which ensures under normal operating conditions, the amplifier only runs warm to the touch.

During the development phase, simulation tools are used extensively to optimise amplifier electrical performance, after which subjective listening tests are undertaken. This latter part of the design process will result in tweaks to extract the last bit of sonic performance – the finished amplifier is thus a delicate balancing act between optimum electrical performance and sonics.

The Ovation High Fidelity Model 1701 Power Amplifier. Engineered for Art.

Product reviews

Paul Rigby reviewing the Model 1701, September 2018

“The quality of the internal design was reflected by the sonic canvas.”

” . . . clarity was present in buckets while midrange transparent was a delight. Examples? Cymbal tapping was precise with transients to die for while a ride cymbal actually sounded like a ride cymbal . . .”

“The instrumental separation also meant that each musician could be followed and tracked without any effort, the vocal providing emotive resonance but also plenty of understated detail.”

“Enhancements [with balanced inputs] included a multi-layered effect in and around the soundstage with that self-same soundstage being pushed backwards to add to the 3D imagery. Transients were further enhanced but reverb was too, giving extra life to all instruments but especially cymbals and piano.”

” . . . the Model 1701 power amplifier reeks of value for money for those readers who are madly in love with music.”

Read Paul Rigby’s full review here Model-1701-amplifier-review-ovation/

Richard Bowles, HiFiWigwam Review of the model 1501 + Model 1701 (June 2017)

“There is an impression of a lightning-fast response from both the pre and power amps. Every note has enormous impact and clarity, despite sound pressure levels verging on the obscene. It feels effortless. ”

“Fast sounding with excellent transient response.”

“Lifelike presentation with superb detail.”

“Wide and deep soundstage.”

“The Ovation High Fidelity products are sonically extremely good. Percussion and brass have impact and a superb leading edge, and recovery from massive transients is seamless. An absolutely immersive sound that breathes life into recordings. ”

“The Ovations are more than good. A lifelike reproduction, combined with the capacity to deliver force and attack. Their ability to portray massive orchestral [music] is fabulous . . .”

You can read Richard Bowles full review here 

HiFi World review of the Model 1501 + Model 1701 by Jon Myles and Noel Keywood June 2017 issue

” . . . quickly impressed with a confident, authoritative sound”

” . . . the Ovations were capable of providing a massive soundstage”

“Moving on to David Byrne and Brian Eno’s ‘My Life in the Bush of Ghosts’ with its complex rhythms and sampled vocals, detail was exceptionally good.”

” . . . the Ovation pre and power amp combination have the makings of something special.”

A compact 100 Watt RMS (8 Ohms) per channel all-symmetrical CMT class AB power amplifier that features wide bandwidth, fast rise/fall times and a 500 Watt power supply, allowing it to drive any domestic speaker load up to its rated power. Short term loudspeaker current demands in excess of 20 A per channel are easily supported by means of an output stage that employs 6 matched 250 Watt power transistors per channel and feature exceptional SOA (Safe Operating Area) capability. Careful attention to signal integrity requirements, amplifier and power supply design and PCB layout have resulted in very low distortion and noise.

The 500 Watt power transformer is custom wound in England and incorporates an inter-winding screen and a flux band to keep mains noise ingress and radiated EMI within the amplifier chassis to an absolute minimum. A  large reservoir capacitor bank, rated at 15% above the highest expected mains voltage, provides huge instantaneous energy reserves that underpin the dynamic performance of this amplifier.

Comprehensive non-intrusive protection circuitry monitors the amplifier for DC offsets and overcurrent situations, which if arising, will result in the speakers being instantly disconnected from the amplifier output. Connection between the amplifier output and the speaker terminals is by means of an innovative solid state relay using ultra-low Rds(on) ‘Trench’ technology MOFET’s with a 200 J energy handling capability. These devices operate at 5~10x the speed and 10x lower ON resistances of the conventional electro-magnetic relays (EMR) used by our competitors. Importantly, our solution suffers no wear out mechanism whatsoever compared to EMR’s. Further protection features include mains switch-on inrush current limiting and loudspeaker muting during power up and power down cycles.

The Model 1701 can accept balanced or single ended inputs which are selected via a push-button switch located on the rear of the unit.

To minimize 3rd harmonic magnetic induction distortion, the chassis is constructed out of aluminium which is of course non-magnetic, while for selected parts like air vents and mounting brackets, stainless steel is used. Connection to the speakers is via high quality WBT style shrouded connectors, that can simultaneously accept 4mm banana plugs and/or 6mm spade lugs.

Only the highest quality, highest performance components from the worlds foremost semiconductor and passive component suppliers are used in Ovation High Fidelity products.

See below for detailed product specifications.

Designed, engineered and hand built in England. 5-year warranty on parts and labour.

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Specification

Inputs Balanced or single Ended - selected via push button on rear panel
Input Sensitivity for rated output 0.5 V into 10 k Ohms on balanced inputs; 1 V into 10 k Ohms for single ended inputs
Output power 100 W RMS into 8 Ohms 20 Hz to 20 kHz; 180 W into 4 Ohms 20 Hz to 20 kHz both channels driven
Peak Power Output Capability (Single Channel Driven) 450 Watts
Peak Current Output Capability (Both Channels Driven) >20 Amps for 20ms
Distortion < 0.002% 20 Hz to 20 kHz 1 W into 8 Ohms; <0.01% 20 Hz to 20 kHz 100 W into 8 Ohms
Signal to Noise Ratio Better than -93 dB ref 1V output; ~110 dB ref max output voltage
Frequency Response 1W into 8 Ohms 20 Hz - 20 kHz +0 dB -0.1dB; 2 Hz - 250 kHz +0 dB -3 dB
Damping Factor approx. 200 at 1kHz into 8 Ohms
Slew Rate (10% to 90%) both postive and negative 140 V/us into 8 Ohm resistive load
Speaker Connectors One set per channel; WBT Style shrouded type accepting standard 4mm banana plug and/or 6mm spade connector
Rise/Fall Time 10-90% Small signal: < 100ns; large signal ~700nS
Power consumption 500 Watts maximum
Weight 15 kgs unit only; 20 kgs including packaging
Dimensions 450mm wide x 350mm deep x 110mm high
Warranty 5 years parts and labour from date of purchase; Terms and conditions apply - see user manual for details, or click on 'Commercial' at the foot of this page for details

Ovation High Fidelity. Audio Equipment Engineered for Art.