The Z-AP series power amplifiers are high sound-quality, sound-performance-first amplifiers that are based on the Z-LX series and further pursued in terms of sound.

The Z-AP series power amplifiers are AB-class power amplifiers designed with music performance as the top priority.
They achieve minimized signal-path length, identical printed-circuit patterns for each channel, adoption of a powerful power-supply circuit, and use of audio-dedicated transistors and capacitors with strong sound-evaluation credentials.
They also feature gain-adjustment circuits independent for each channel, premium high-rigidity RCA terminals, and a design that embodies a sound-quality-first philosophy.
A sound with rich musicality and no listening fatigue is an excellent power amplifier that captivates the listener.

The lineup includes three models with 150W output in 2ch/4ch/6ch configurations, as well as a high-power 400W output 2ch model.

For all models, the final devices in the power-amp section are driven in a parallel push-pull configuration using Sankens TO-3P power transistors 2SA-2151A/2SC-6011A, which are well regarded for sound quality.
In the drive stage of the high-power 2ch model Z-400.2AP, the power stage is driven powerfully using Sankens TO-3P power transistors 2SA-1695/2SC-4468.

For the circuit configuration of the signal line, a Texas Instruments LME49720 operational amplifier with low output impedance is used.
For coupling and power-supply enhancement, audio-dedicated electrolytic capacitors are used.
For the semiconductors in the amplification section, Toshibas low-noise transistors, high-end WIMA film capacitors, and 0.1% tolerance metal film resistors are used, resulting in a high-grade circuit specification that goes beyond the class.

The power-supply switching devices drive MOS-FETs with 2-parallel/3-parallel configurations, using a large toroidal transformer and large-capacity electrolytic capacitors for audio power-supply smoothing, thereby building a powerful power-supply circuit.

For protection, in the event of abnormalities such as thermal issues, overload, or short circuits, the high-speed protection function operates.

Z-150.6AP　Main Features
・150W×6ch (4Ω stereo)
・AB-class operation with natural sound
・Floating input that prevents ground from forming a loop
・Uses the TI LME49720 operational amplifier (low output impedance) for the input circuit
・Uses Toshibas low-noise transistors in the amplification section
・Uses Sankens TO-3P power transistors 2SA-2151A/2SC-6011A for the power stage
・Uses audio-dedicated electrolytic capacitors throughout
・0.1% tolerance metal film resistors

Z-150.6AP　Main Specifications
Channel mode
3ch/4ch/5ch
Output power
150W×6ch　4Ω stereo

250W×6ch　2Ω stereo

500W×3ch　4Ω bridge
Output-stage operating class
AB-class operation
Frequency response
10〓30KHz
Distortion
0.05% or less
S/N ratio
110dB or more
Channel separation
60dB or more
Input sensitivity
1.0V〓9.0V
Input impedance
30KΩ
Pre-out
None
High-level input
Not supported　High-level/auto power-on possible with separately sold ASP-OEB
Auto power-on function
Not supported
Operating power supply voltage
10.0V〓16.0V
Idle current
1.2A (no-signal)
Fuse
No built-in fuse (be sure to connect an external 80A fuse)
Dimensions (W×H×D)
190×62×573(mm)
Weight
7.6Kg