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TEAC- USA TEAC AP-505B Stereo Power Amplifier
An ultra-compact stereo power amplifier, powered by Hypex Ncore technology, designed to enable Bi-amping to reproduce real musical dynamics with high precision.
The AP-505 employs a high-performance, energy-efficient Hypex Ncore power amplifier module which produces 130W + 130W in stereo/bi-amp modes or 250W in BTL mode. The module, which has undergone extensive listening tests before being carefully tuned and tweaked by our engineers, easily drives a wide range of speakers. In other words, it reproduces real musical dynamics with high precision.
Not only for conventional stereo mode with 130W + 130W of output power, this compact unit also provides versatile speaker drive modes, Bi-amp, and BTL modes by deploying a couple of AP-505 units side by side. The Bi-amp mode drives woofer and tweeter independently, while the BTL modes produce 250W of output power in each channel.
Every external panel – at the front, top, and sides - is formed from high-grade aluminum alloy, firmly attached to the robust steel inner chassis. This method of construction helps reduce the transmission of mechanical vibration, ensuring that every single element inside the unit is allowed to perform at its best. Thanks to its convenient A4-sized footprint, the AP-505 easily slots into modern interiors where space efficiency is important, such as on a desktop. This is in stark contrast to most conventional bi-amp/BTL-capable power amplifiers which are usually bulky, full-width units.
By employing a fully-balanced circuit design from the input section to the output stage, the AP-505 keeps the audio signal as unadulterated as possible as it moves through the amplifier, the result being extremely low distortion levels and an excellent signal-to-noise ratio (assisted by the effective elimination of common-mode noise).
At the input stage, where sound quality is fundamentally defined, high-quality MUSES8820E dual op-amps are employed for both the XLR and RCA inputs. In the power supply section for the input stage, both the left and right channel rectifying circuits are completely independent of the power transformer onwards and employ four, high-capacity, 4700μF capacitors on each channel (8 in total), achieving clear soundstage separation between channels.
At the XLR input section, a well-designed circuit delivers excellent signal integrity, thanks in part to the elimination of coupling capacitors that can often lose audio information as a signal travels through them.
In the power supply, the AP-505 employs a high-capacity toroidal-core transformer, with Schottky barrier diodes in the rectifying circuit. Unlike conventional diodes, Schottky barrier diodes reduce rectifier noise, leading to a ‘cleaner’ supply and a more stable delivery of current.
The AP-505 employs TEAC's patent-pending ‘Pin-Point’ feet. These comprise two separated metal sections in integrated housing. One has a spiked top and is attached to the bottom of the chassis, the other is a basin-shaped base that hangs down from the spiked section, with a flange-shaped cup to simplify installation. As a result of the unique design, the ‘Pin-Point’ feet considerably minimize vibrations and resonance, by virtue of the fact that the unit is supported on just three points, with a very small surface contact area. This arrangement reduces mid and low-frequency muddiness so improving the soundstage and enhancing fine sonic detail.
* Japan Patent numbers 4075477 and 3778108
It makes no sense to design an amplifier that delivers excellent sound to a pair of speakers but which itself generates distracting operating noise from a cooling fan. From the outset, our engineers were determined to use a circuit and layout that would allow sufficient natural cooling, one that would allow the creation of a compact but powerful amplifier that didn’t need the help of a cooling fan.
Analog level meters on the front panel move in response to signal levels, giving a visually pleasing confirmation that the amplifier is doing its job. A four-step dimmer (bright, mid, dim off) allows users to adjust the intensity of the display to their taste, while a switchable sensitivity (±0dB, +20dB, movement off) allows you to enjoy more, less, or even no meter movement if preferred.
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TEAC AP-505B Stereo Power Amplifier
The AP-505B pairs a compact, fanless chassis with a Hypex Ncore output stage to deliver reference-class transparency and muscular control, as noted by Jay Garrett and The Ear Editor.
Sonically it emphasises clarity and neutrality—very low distortion, high SNR and a high damping factor give taut bass, detailed mids and clean treble with a wide, stable stereo image. Fully‑balanced signal path and MUSES input op-amps aid resolution and keep noise to a minimum.
Build-wise it combines a steel chassis, aluminium panels, toroidal transformer and retro analogue meters with a four-step dimmer; the fanless layout and Pin‑point feet support stable, long‑term operation. Ideal for listeners seeking transparent power in a space‑efficient package; the asking price positions it as a compelling mid‑range contender.
Pros
- Very low distortion and high signal-to-noise from a fully-balanced signal path and quality front-end components, delivering transparent, neutral presentation.
- Strong dynamics and speaker control driven by the Hypex Ncore module, high-capacity toroidal transformer and Schottky rectifiers—supports good headroom and tight bass.
- Well-executed, compact, fanless build with analogue level meters, adjustable dimmer and Pin‑point feet—combines thoughtful ergonomics with solid thermal and mechanical design.
Sound Quality
90/100
Dynamics
91/100
Reviewers highlight the Hypex Ncore module, a high-capacity toroidal transformer and Schottky rectifiers that deliver a cleaner, more stable current; TEAC and press coverage note up to 115Wpc (stereo) and 220W bridged. The very high quoted damping factor (370+) and low measured THD/SNR figures support strong speaker control and transient authority. Taken together the reportage indicates excellent headroom and grip for this power-class amp.
Soundstage Imaging
89/100
TEAC and reviewers note independent rectifying circuits for left/right channels and four 4700µF caps per channel, claims intended to improve channel separation; TEAC's ‘Pin-point’ feet are said to add incision and stability to imaging. Press coverage repeats these design points and presents them as contributing to a stable, well-defined stereo image. The evidence supports very good spatial performance for the price class.
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Build Quality
89/100
Construction described as a robust steel chassis with lightweight aluminium-alloy panels, a fanless footprint and a substantial toroidal transformer paired with high-capacity capacitors; reviewers explicitly note the Hypex Ncore module and a fanless design. The physical design and cooling approach are presented as well thought out for a compact, powerful amp, suggesting solid component and thermal choices for long-term reliability.
Value for Money
86/100
Street price reported at about £1,349 / €1,499 in the reviews; press coverage lists the price but offers no strong value verdict. Given the combination of Hypex Ncore output, high damping factor, balanced topology and toroidal transformer at this price, the unit appears competitively positioned in its segment though reviewers stop short of explicit 'best buy' language. Score reflects a neutral-to-positive value judgement based on features and performance versus the cited price.
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