TEAC AP505B Stereo Power Amplifier – Black | Polk Audio Monitor XT15 Compact Bookshelf Speakers – Pair

Brand: Polk Audio, TEAC
Model Number: 314112
Model Number: 314112
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TEAC AP505B Stereo Power Amplifier – Black | Polk Audio Monitor XT15 Compact Bookshelf Speakers – Pair

This Bundle Includes:
(1) TEAC AP505B Reference 500 Series Stereo Power Amplifier – Black
(1) Polk Audio Monitor XT15 Compact Bookshelf Speakers – Pair

Ships direct from manufacturer, shipping times can vary

Product Description

Features & Specifications



TEAC AP505B Stereo Power Amplifier – Black | Polk Audio Monitor XT15 Compact Bookshelf Speakers – Pair

This Bundle Includes:
(1) TEAC AP505B Reference 500 Series Stereo Power Amplifier – Black
(1) Polk Audio Monitor XT15 Compact Bookshelf Speakers – Pair

TEAC AP505B Reference 500 Series Stereo Power Amplifier – Black

A stereo power amplifier that is incredibly small and uses Hypex Ncore technology to enable bi-amping or BTL (Bridge Tied Load/Bridged) mode A high-performance, TEAC-tuned Hypex Ncore power amplifier module contained inside a small, stylish housing, serves as the foundation of the adaptable stereo power amplifier known as the AP505B.

The AP505B may operate in stereo, bi-amp, and BTL (Bridge Tied Load/Bridged) modes, in addition to traditional stereo operation. In stereo and bi-amp modes, the AP-505 can output a maximum of 130W + 130W and 250W, respectively. Its core is a Ncore power amplifier module developed by Dutch company Hypex that has been expertly tweaked for outstanding sound quality by TEAC’s R&D team.

A sturdy steel chassis is covered by lightweight aluminum-alloy panels on the outside. When the amplifier is in use, two huge level metres offer visual interest, and three strategically placed “Pin-point” feet on the underside of the amplifier lend incision to the sound, assisting in the creation of a more stable and detailed stereo image.

NCore Audio Power Conversion

The Hypex Ncore power amplifier module used in the AP505B is high-performance and energy-efficient, producing 250W in BTL mode or 130W + 130W in stereo/bi-amp modes. The module, which has been meticulously calibrated and tweaked by our engineers after undergoing rigorous listening tests, readily drives a variety of speakers, giving anything from a pianissimo to a fortissimo and everything in between. Therefore, it accurately mimics the dynamics of real music.

Stereo, Bi-amp, And BTL Modes Are Supported

By placing a few AP505B units side by side, this little unit offers multiple speaker driving modes, Bi-amp, and BTL modes in addition to the traditional stereo mode with 130W + 130W of output power. While the BTL modes create 250W of output power in each channel, the Bi-amp mode drives the woofer and tweeter separately.

Stiffness, Stability And Elegance Provided By A Full-Metal, Small-Footprint Body

Every exterior panel, including those on the front, top, and sides is made of a sturdy steel core chassis and a high-grade aluminium alloy. This technique of construction ensures that every component inside the unit is able to operate at its peak performance by reducing the transmission of mechanical vibration. Because of its practical A4-sized footprint, the AP505B fits in seamlessly in contemporary settings where saving space is crucial, like a desktop. Contrast this with the majority of traditional bi-amp/BTL-capable power amplifiers, which are typically hefty, full-width equipment.

Full-Scale Balance

The AP505B maintains the audio signal as pure as possible as it passes through the amplifier by using a fully balanced circuit design from the input section to the output stage. This leads to extremely low distortion levels and a fantastic signal-to-noise ratio (assisted by the effective elimination of common-mode noise).

Components That Have Been Carefully Chosen And Are Only Used In Hi-Fi Applications

High-quality MUSES8820E dual op-amps are used at the input stage, where sound quality is essentially determined, for both the XLR and RCA inputs. The left and right channel rectifying circuits use four high-capacity 4700F capacitors on each channel (8 in total) in the power supply part of the input stage to achieve distinct soundstage separation between the left and right channels.
A well-designed circuit provides great signal integrity at the XLR input portion, in part due to the removal of coupling capacitors, which frequently cause audio information to be lost as a signal passes through them.

Large Toroidal Power Transformer

The AP505B’s power supply uses a large capacity toroidal-core transformer while the rectifying circuit uses Schottky barrier diodes. Schottky barrier diodes, as opposed to conventional diodes, lessen rectifier noise, resulting in a “cleaner” supply and a more steady delivery of current.

Easy Installation Thanks To ‘Pin-Point’ Feet

The AP505B uses the “Pin-Point” feet that TEAC is attempting to patent. These consist of two independent metal pieces enclosed in a single housing. One is attached to the chassis’s bottom and has a spiked top, while the other has a basin-shaped base with a flange-shaped cup that hangs down from the spiked area. The ‘Pin-Point’ feet have a special design that significantly reduces vibrations and resonance because the unit is held by just three points and has a very limited surface contact area. This arrangement improves the soundstage and enhances fine auditory clarity by reducing mid- and low-frequency muddiness.

Design Using Passive Cooling For Silent Operation

Designing an amplifier that produces a pair of speakers with outstanding sound but also produces a cooling fan that is always making noise is absurd. Our engineers were adamant from the beginning to adopt a circuit and layout that would permit adequate natural cooling, enabling the design of a small but powerful amplifier that didn’t require a cooling fan.

Dual Analogue Level Meters Indicate The Musical Tempo

The AP505B front panel’s analogue level metres move in reaction to signal levels, providing an aesthetically pleasing indication that the amplifier is functioning as intended. Users may alter the display’s intensity in four steps (bright, mid, dim off), and a switchable sensitivity (0dB, +20dB, movement off) lets them choose whether they’d like to see more, less, or even no metre movement.
Naturally, you can determine the device is on even if the lighting is out and the metre movement has been disabled by looking at the location of the power switch!


  • TEAC-tuned Hypex Ncore power amplifier module
  • Maximum output power of 130W plus 130W, or 250W in BTL/bridged mode.
  • Able to function in stereo, bi-amp, and bridged/BTL modes
  • Complete circuit balancing
  • Carefully chosen premium components created specifically for hi-fi applications
  • Large-scale Schottky barrier diodes and toroidal power transformers
  • Circuits for comprehensive protection (Surge, Over-voltage, Thermal)
  • Pin-point feet for simple installation that are still subject to patent (Japan Patent Nos. 4075477, 3778108)
  • Substantial level metres
  • Use of passive cooling to achieve silence
  • Full-metal body with an A4-sized footprint for rigidity, stability, and elegance
  • Analogue audio inputs with XLR balanced and RCA unbalanced connections (one set of each)
  • Screw-type speaker connectors with a wide pitch
  • Automatic power saving
  • RoHS compliant

Polk Audio Monitor XT15 Compact Bookshelf Speakers – Pair

Compact and affordable, the Polk Audio Monitor XT15 maximizes the enjoyment of music, gaming, and movies with energetic, high-resolution sound with effortless bass. Use the MXT15 for front left and right channels or as side or surround speakers. It’s also wall-mountable allowing for flexible placement.

Maximize Your Enjoyment of Music, Movies, and Gaming

Monitor XT15 maximizes your enjoyment of music, movies, TV and gaming with dynamic, high-resolution sound featuring effortless bass. Hi-Res Audio and Dolby Atmos Certified, DTS:X compatible, and in an affordable, wall-mountable design that can be placed nearly anywhere, the MXT15 fulfills the Polk promise of great sound for all.

Feel The Difference Hi-Res Audio Certified Performance

The Polk Audio Monitor XT15 speakers Terylene dome tweeters enable playback beyond the range of human hearing—up to 40kHz—ensuring an airy, clear, high-end energy and spaciousness that you’ll not only hear but feel. MXT15 is a perfect speaker set to enjoy high resolution movies, gaming or the latest hi-res streaming services like Apple Music, Tidal, Amazon Music HD, Qobuz and Spotify HiFi.

Low Distortion, High Impact Surprisingly Effortless Bass

Polk has always been known for speakers that produce effortless bass that’s surprising for their size. The MXT15 is no exception. Beefy 5.25” high-efficiency, dynamically balanced woofers provide a clean, open mid-range and punchy, responsive bass, with low distortion—making voices and instruments clearly heard and movie soundtracks and music filled with impact.

Ready To Rock Dolby Atmos Certified & DTS:X Compatible

Compatible with the latest Dolby Atmos and DTS:X surround sound enabled AV receivers and 4- & 8-ohm amplifiers, Polk Audio Monitor XT15 does not require specialized equipment to deliver great sound.

Precision Made Built for Pure Listening

All Monitor XT models are made for the enjoyment of pure sound: Their nickel- plated binding posts guarantee a direct, lossless connection; critically braced MDF cabinets isolate the sound of the woofer and tweeter without adding unwanted resonances; and their removable, precision-fit grilles minimize sonic interference.

Brand TEAC   Model TEAC 314112
Product: TEAC AP505B Stereo Power Amplifier - Black | Polk Audio Monitor XT15 Compact Bookshelf Speakers – Pair
Amplifier - DAC



Amplifier section

Stereo, Bi-amp modes: 130W + 130W (4Ω, 1kHz, JEITA) 90W + 90W (8Ω, 1kHz, JEITA)
BTL (Bridge) mode: 250W (8Ω, 1kHz, JEITA)
Stereo, Bi-amp modes: 115W + 115W (4Ω, 1kHz, THD 0.8%) 70W + 70W (8Ω, 1kHz, THD 0.8%)
BTL (Bridge) mode: 220W (8Ω, 1kHz, THD 0.8%)
Total harmonic distortion: 0.0015% (8Ω, 1kHz, 12.5W, JEITA)
Signal-to-Noise ratio: 113dB (8Ω, 1kHz, IHF-A)
Frequency response: 10Hz to 50,000Hz (+0dB, –5dB, 8Ω, 1W, JEITA)
Dumping factor: 370 or higher, JEITA (20Hz to 20kHz, Output impedance: 22mΩ, 8Ω loaded)

Input section

LINE IN (Balanced)
Connector: XLR (2: HOT) × 1 pair
Input sensitivity: 1.3V (Output 8Ω, THD 1%)
Input impedance: 10kΩ or higher
LINE IN (Unbalance)
Connector: RCA Pin (gold-plated) × 1 pair
Input sensitivity: 0.66V (Output 8Ω, THD 1%)
Input impedance: 10kΩ or higher

Speaker outputs

Connector: Screw type × 1 set (gold-plated, AWG8 and Banana-plug compatible)
Compatible speaker impedance
Stereo, Bi-amp modes: 4Ω to 16Ω
BTL (Bridge) mode: 8Ω to 16Ω
Power: AC220 to 240V, 50Hz (UK/Europe)
Power consumption: 106W
Standby power: 0.1W or less (at Auto power-saving mode)
Overall dimensions: 290 × 84.5 × 271 mm / 11.4" × 3.3" × 10.7" (W × H × D)
Weight: 4.4kg / 9.7 lbs.
Included accessories: Power code, Owner's manual (incl. Warranty card)

Polk Audio Monitor XT15 Specifications

– Front Array Driver Complement: (1) 1" (2.54 cm) Terylene Dome Tweeter, (1) 5.25" (13.43 cm) Bi-laminate Paper Woofer
– Impedance: Compatible with 4- and 8-ohm outputs
– Total Frequency Response: 48Hz → 40,000Hz
– Max Sensitivity (1 watt @ 1 meter): 86dB
– Crossover Frequency: 2200Hz
– Mounting Type: 1/4" 20 Threaded Insert or Keyhole Hanger
– Recommended Amplifier Power Per Channel: 30 → 150W
– Speaker Inputs: (1) Pair of 5-way nickel-plated binding posts

– Width: 6.5" (16.51cm)
– Depth: 7.18" (18.24cm)

– 9Ibs/4.08kg


Enclosure Type
Passive Radiator

4 Ω, 8 Ω

Number of Speakers
2 Speakers

Speaker Sensitivity
86 – 90 db

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TEAC Canada 1 Year Limited Warranty
Polk Audio offers a limited 5 year Warranty


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