STEREO POWER AMPLIFIER● Large output 300 W / 8 ohms, 600 W / 4 ohms, 900 W / 2 ohms ● 10-parallelpush-pull output stage power transistors ● Instrumentation amplifier principle● Current feedback amplification circuits ● Balanced Remote Sensing ● MCS+ circuit● High damping factor of 1,000 ● Speaker output protection ● Highly responsive
large-scale power meters ● Support for bi-amping and bridged mode connection

High output stereo power amplifier bursting with musical expression
The P-7500 is our flagship model Class AB stereo power amplifier that provides supreme driving performance. The power
amplification stage uses a 10-parallel push-pull power transistor architecture, providing a rated output power of
300 W / 8 ohms that vastly exceeds that of conventional models. Boasting an impressive signal-to-noise ratio of 130 dBand a damping factor of 1,000, it can effortlessly drive massive speakers and create musical recreations overflowing withenergy. The P-7500 brings out the best of any speaker, allowing you to enjoy never-before experienced soundscapes.

Groundbreaking technology
The P-7500 power amplifier uses state-of-the-art circuitry
and the highest quality materials to achieve a perfect blendof refined responsiveness and groundbreaking technology.
■ Ample output power
The 10-parallel push-pull power transistor output stage produces
linear output power of 300 W into 8 ohms or 600 W into 4 ohms,
and a whopping 900 W into 2 ohms of maximum output power.

■ Ultra low noise performance
Ideal gain distribution and other sophisticatedtechniques improve noise level suppression by
11% over the previous model.

11% improvement
16μV

P-7500Previousmodel■ Instrumentation amplifier+＋

With balanced circuits in the signal
input section, the amplification stage iscomprised entirely of an instrumentation
amplifier principle that equalizes input
impedance on the + and – sides, forexcellent external noise suppression,and providing optimal circuitry for thishigh-end audio amplifier.

–+––−+−＋Signal
input sectionPoweramplification section■ Ideal gain distribution

18μV

Noise level

Noise level suppression has been dramatically improved by assigning a highgain (12.6×) in the signal input section with excellent noise figure results.

■ High damping factor
With a damping factor of 1,000, the speakers can be driven with full control
over the counter-electromotive forces to get the most out of your speakers.

+

12.6×+

2×■ Balanced remote sensing
Balanced remote sensing
improves damping factor
by feeding back the GND
at the same time as signal
output from the speakerterminals.

SignalPower
input section amplification section
Signalfeedback Signal sensing＋Poweramplification−GND
feedback4×‑‑Signal
Power
input section amplification section

P-7500

point

6.3×

Conventional models

Gain distribution comparison＋GND sensing
point■ Current feedback amplification topology−■ MCS+ (Multiple Circuit Summing-up) principle
By placing the voltage amplification stage in a two-parallel circuit layout,
the MCS+ circuit theoretically reduces the noise floor by 30%.

The current feedback amplification circuit
offers excellent phase characteristics in
the high-frequency range with almost no
impact on the frequency response evenwhen gain is switched, resulting in naturaland dynamic driving of the speakers.

Transformer impedance−I-V
converter

BufferCurrent
summing＋

BufferCurrent NFBnetwork■ Three-stage Darlington configuration

2-parallel circuit

The three-stage Darlington configuration that drives the final output stage
by a two-stage drive circuit minimizes any negative influence on the output
stage from the counter-electromotive forces of the speakers.

＋−

Protection circuitry

2-parallel circuit layout of MCS+ principle

MCS+ circuitry

Signal input section(GAIN 22 dB / 12.6×)

Power amplification section(GAIN 6 dB / 2×)
MCS＋+ B1+ B2Three-stage Darlington configuration

BIAS+ B2+ B310-parallel push-pull output stage

BIAS+ B4

BIAS＋Input- B2GNDGain
Selector- B1

MAX- 3dB- 6dB- 12dBFeedback NetworkDC ServoOutput

BIAS＋−+ B1

GND+ B2−Input

Toroidal transformer

BIAS

- B4

BIAS

- B3- B2
BIAS

- B1- B2

Circuit diagram (one channel)

L ch power
Filtering capacitors
amplification section

R ch power
amplification section

Advanced features■ 300 W / 8 ohms, 600 W / 4 ohms, 900 W / 2 ohms large
output power■ 10-parallel push-pull power transistor output stage■ Instrumentation amplifier principle■ Current feedback amplification topology■ Balanced remote sensing■ MCS+ circuitry■ Three-stage Darlington configuration■ Meter display switching・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・①■ LINE / BALANCED input switching・・・・・・・・・・・・・・・・・・・・・・・・・・・②■ 4-step gain control・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・③■ Polarity switching of balanced input connectors ・・・・・・・④■ Support for bi-amping and bridged modes・・・・・・・・・・・・・・・・⑤■ Ideal gain distribution in the signal input section ・・・・・・⑥■ Speaker output protection with short-circuit detection・・・⑦■ Large speaker terminals connected directly toprotection circuitry ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・⑧■ Edgewise coils improve damping factor ・・・・・・・・・・・・・・・・・・・⑨■ Highly reliable MOS-FET switches with no mechanicalconnections ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・⑩■ Large, high-efficiency toroidal transformer ・・・・・・・・・・・・・・・⑪■ High-capacity 60,000 μF filtering capacitors・・・・・・・・・・・・・・⑫■ Aluminum hairline finish top plate ・・・・・・・・・・・・・・・・・・・・・・・・・・・⑬■ Large, hi-sensitivity –50 to +3 dB power meters ・・・・・・・・⑭■ High-carbon cast iron insulator feet with superior
damping characteristics ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・⑮■ Power amplification section with a large heat sink・・・・・⑯①Meter display

selector②Input selector ③Gainbutton

selector④Balanced input

polarity selector⑥Signal input section⑤Operation

selector⑦Protection circuitry⑧Speaker terminals⑨Edgewise coil

⑩MOS-FET switches⑪Toroidal transformer⑫Filtering capacitors⑬Top plate⑭Power meter⑮Insulator feet

⑯Power amplification section

Bridged connection

Bi-amping connection

R Speaker

L Speaker

Jumperconnection

Jumperconnection

L

RRL

Jumpers
removedL

RR

R L
Input to L

L

R L
P-7500 for LLR

R SpeakerL Speaker

Operation
selector

Input to L

RL

R

L

R

LR

L

R L
P-7500 for R

Both channels used for BRIDGE

Operation
selector

Input to L

R L
P-7500 for L
L

(lit)

Preamplifier

Operation
selector

R

Meter display
selector

P-7500 for R

Operation
selector

Both channels used for DUAL MONO

(lit)

Operation selector(rear panel)

Dual mono indicator(front panel)

Bridge indicator(front panel)

Front Panel
Dual monoindicator

Input to L

Preamplifier
Operation selector(rear panel)

Bridgeindicator

Jumpers
removedPower meters

Rear Panel

Input indicators

Power switch Input selector
buttonSupported spade lug dimensions

Speaker terminals(Upper and lower terminals
output the same signal)

Gainselector

Min.
6.3 mm(0.25”)

Max.
19 mm(0.74”)

AC power supply connector
Operation selector
Balanced input polarity selector

Line input terminals
Balanced input connectors

Guaranteed Specifications
Load
8 ohms 4 ohms 2 ohms
Normal / bi-amping connection 300 W 600 W＊1 900 W＊1
Bridged connection
1200 W＊1 1800 W＊1−2 ohms
0.05%
Normal / bi-amping
Total Harmonic Distortion
connection
4 to 16 ohms
0.03%
(20 – 20,000 Hz)
Bridged connection
4 to 16 ohms
0.05%Intermodulation Distortion
0.01%
At rated output
20 – 20,000 Hz (+0, –0.2 dB)
Frequency Response
0.5 – 160,000 Hz (+0, –3.0 dB)
At 1 W output
Damping Factor
Normal / bi-amping connection
1,000 or greater
Input Impedance
BALANCED / LINE input
40 kilohms / 20 kilohms
OutputAt rated output At 1 W output
Input Sensitivity
Normal / bi-amping connection
1.95 V
0.11 V
Bridged connection
3.90 V
0.11 V
Signal-to-Noise Ratio
Gain Switch at MAX / at –12 dB
130 dB / 135 dB(A-weighted, input shorted)
Rated Output(20 – 20,000 Hz, 0.05%)

Gain

Gain switch

MAX−3 dB

−6 dB −12 dB

Normal / bi-amping / bridged connection

28 dB

25 dB

22 dB

FormatPower Meters

Power Requirements

16 dB

Logarithmic scale, with illumination off switch

Display range−∞ to +3 dB

Peak hold time

3 sec. / ∞ switchable

During bridged connection

Displays same value for left and right120/220/230 V AC, 50/60 Hz (Voltage as indicated on rear panel)PowerConsumption

Idle

142 W

In accordance with IEC 62368-1

450 W

Stand-by

0.3 W

Maximum
Dimensions

Width 465 mm (18.3”) × Height 238 mm (9.4”) × Depth 515 mm (20.3”)

MassNet49.0 kg (108.1 lbs)

In shipping carton

58 kg (128 lbs)

“Normal connection” indicates standard stereo operation.
＊1: Limited to music signals

Supplied accessories● AC power cord
Remarks★ This product is available in versions for 120/220/230 V AC. Make sure that the voltage shown on the rear panel matches the AC line voltage in your area.
★ The 230 V version has an Eco Mode that switches power off after 120 minutes of inactivity.
★ The shape of the plug of the supplied AC power cord depends on the voltage rating and destination country.

●The specifications and appearance of this product are subject to change without notice.

https://www.accuphase.com

C2204Y

850-2229-00（B1） PRINTED IN JAPAN