The power amplifier is the final component in the signal chain before the loudspeakers. It is the workhorse of a hi-fi system. It takes the low-level signal from the pre-amplifier and converts it to a powerful signal to drive the loudspeakers. It has a low-level input to receive the signal from the preamplifier, and terminals for connecting loudspeaker cables.
Because of the power amplifier's unique function, it differs from other components in size, weight and use. High-quality power amplifiers are usually large and heavy. Moreover, the power amplifier is the component you don't need to touch and adjust. Consequently, power amplifiers are often placed on the floor near the loudspeakers rather than in an equipment rack.
STEREO POWER AMPLIFIER:
A power amplifier with two audio channels (left and right) in one chassis.
MONOBLOCK POWER AMPLIFIER:
A power amplifier with only one audio channel per chassis. Two monoblocks are required for stereo reproduction.
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Parasound New Classic 2250 v.2
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• THX Ultra2 certified
• 275 watts x 2 into 8 Ω (all channels driven)
• 400 watts x 2 into 4 Ω or 2 Ω (all channels driven)
• 750 watts x 1 bridged into 8 Ω or 4 Ω
• 45 amps peak current per channel
• 2 Ohm stable operation with load selector switch
• Two pairs of speaker outputs with front panel A/B buttons
• Rear-mounted lockout switch disables front A/B buttons
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Parasound HALO A23 Plus Power Amplifier
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Parasound Halo A23+
Changes from the original A 23→A 23+:-
•125 → 160 Watts (8Ω)
•225 → 240 Watts (4Ω)
•400 → 500 Watts (bridged)
•Filter cap: 40,000 uF →54,400 uF
•Crosstalk (20kHz): 63dB → 70dB
•Transformer size: 1.0 kVA → 1.1 kVA
•Refined Halo cosmetic with aluminum end caps & gold highlights
•Updated rear panel with heavy duty speaker terminals from HINT 6
•Upgraded internal gold on gold audio connections
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Parasound HALO A21 Plus - Stereo Power Amplifier
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Halo A21+
Changes from the original A 21→A 21+ :-
•250 → 300 Watts (8Ω)
•400 → 500 Watts (4Ω)
•750 → 1000 Watts (bridged)
•Filter cap: 88,000 uF → 108,000 uF
•S/N: 112dB → 115 dB
•THD (at full power): 0.2% → 0.1%
•Crosstalk (20kHz): 63dB → 70dB
•Transformer size: 1.2 kVA → 1.3 kVA
•Weight: 60 LB → 71 LB
•Refined Halo cosmetic with aluminum end caps & gold highlights
•Updated rear panel with heavy duty speaker terminals from JC 5
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Parasound Z Amp V3 Power Amplifier
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Ultra Compact Power Amplifier. 2 x 45W - 8 Ohms. Ideal For Multi-Room Use
The ‘Zamp’ was the first Z Series product to be developed, and like other Z Series models, is barely larger than a good book, yet it provides performance and features that belie its size and cost.
Now available in Mk III version, the two-channel ‘Zamp’ continues to be the installer’s first choice for discreet amplification.
The
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Quad II - Classic 15W Valve Mono Power Amplifiers
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II-classic 15W Valve mono power amplifier
A faithful reproduction of the original, the new Quad II-classic offers audiophiles the chance to recreate the spirit and atmosphere produced from one of the most famous amplifiers in audio history. The original Quad II was first launched in 1953, designed by Peter Walker. At the time, many of his contemporaries were also producing good quality valve amplifiers. The Quad II looked, in comparison, very simple and unassuming, but its performance was far beyond that which its diminutive dimensions might suggest. The property which set the Quad II amplifier apart from other amplifiers of the time was its output stage. It was arranged such that the cathode coupled circuit emulated the performance of triode operation, but with the size and efficiency characteristics of pentode operation. It was this breakthrough that ensured the Quad II was to remain in continuous production until 1970. Peter’s circuit, notably the design of the output transformer, has become the stuff of legend amongst electronics engineers. Studied and analysed by the finest minds in the industry, the elegance and coherence of the design is still regarded as a reference today.
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Quad II - Forty Valve Mono Power Amplifiers
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II-forty 40W Valve mono power amplifier
The Quad II-forty retains the elegance of the 1950s Quad II but with a level of sophistication, a build quality and finish rarely seen on any product old or new. The chassis has been substantially increased in size to accommodate the much larger components, all of which are hard wired by hand following a similar topology to the original. The modern listener demands a higher output than the fifteen watts of the original Quad II. The new Quad II-forty uses larger output valves, KT88s instead of KT66s, and a more robust power supply utilising a 5U4G rectifier valve. The input valves are now military specification 6SH7s instead of EF86s.
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EAR 890 Power Amplifier
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EAR890 Parallel Push Pull 8 Valve Power Amplifier
The 800 series of amplifiers from EAR has received widespread and consistent acclaim from users and reviewers the world over. However, feedback from some quarters suggested that there was a need for an amplifier with similar sonic prowess but just a little more power.
Taking as a starting point the circuits used in the 834 integrated amplifier, Tim de Paravicini has addressed that need by producing the 890 power amplifier. Using the innovative KT90 valve from EI, he has been able to offer 70W of clean Class-A audio from the same chassis as the 834. One of the few new valve designs of the last 30 years, the KT90 draws on the strengths of the EL509 valve (as used in many EAR amplifiers) and is capable of sustained high power operation with great reliability. Two pairs per channel are hardly stressed in the EAR 890.
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Naim NAP 500 DR
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Our design brief for the NAP 500 required an amplifier that could drive any load down to 2 Ohms for prolonged periods, deliver over 100W into 8 Ohms and sound - at the very least - as good as our reference at the time, the NAP135.
Naim has always understood the importance of reducing supply-induced intermodulation distortions and mains harmonic electrical noise from an amplifier, and has always used regulated supplies in its premier amplifiers. It was considered likely that improvements in these areas would yield further large gains in performance. Each channel of the NAP 500 includes ten stages of local regulation. To reduce interference from the mains supply further, the transformer and first stages of the power supply are in a separate enclosure (the same size as a Supercap), which provides twelve raw d.c. supplies for the power amplifier. Hence, the NAP 500 system consists of two boxes, a stereo amplifier and a separate power supply.
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£ 21,999.00
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| * Only available for purchase in-store |
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Naim NAP 300 DR
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After seventeen successful years at the top of Naim's amplifier range, the NAP 135 has been eclipsed by the flagship NAP 500. Many years of research went into the NAP 500, as fundamentally new components and technologies had to be perfected before Naim could raise the performance level. Many of these technical developments, along with the elegant new styling have been applied to the mighty NAP 300.
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£ 8,599.00
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| * Only available for purchase in-store |
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Naim NAP 250 DR
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The newest Naim NAP 250 delivers speed, power and agility providing exceptional detail and musicality in a package built to swing for another 25 years.
For 27 years the NAP 250 has been at the heart of thousands of high-quality audio systems around the world. During the years of research that went into the NAP 500, many technical developments came about that could be successfully applied to the NAP 250. Many of these developments, along with the elegant new styling have been incorporated, resulting in a new Classic line-up.
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£ 4,299.00
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| * Only available for purchase in-store |
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( Displaying 10 of 209 Products )
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