Audio Database

Grand Integra M-510
Commentary

This is a stereo power amplifier developed using technologies such as the double-trans drive system to enable the ultimate music playback.

In a general amplifier, the current that is out of phase due to the characteristics of the speaker is returned to the amplifier through flux, ground, or B power supply. This out-of-phase signal is superimposed on the input signal, and the mixed phase acts as the input signal. Therefore, the correct phase information originally contained in music information is disturbed, and the sound field feeling that produces a subtle phase difference is also disturbed.
The M-510 is equipped with an in-phase transformer in the current path to prevent out-of-phase components from returning to the amplifier. In this in-phase transformer, when a current with a waveform on the positive side flows, the current with the same waveform flows on the negative side with exactly opposite phases. This allows the positive side and the negative side to mutually control each other, canceling only the extra components that come back on the power supply current. This improves low-frequency braking and provides excellent low-frequency playback.
In addition, the in-phase transformer suppresses the overburden of the flux generated from the power supply and improves the low-level regeneration capability.

By separating the left and right power transformers and using another transformer for the power supply other than the signal system, there are three power transformers. In addition, the right and left power circuits are equipped with in-phase transformers, so there are five transformers in total.

Four capacitors of 33000 μ F/100V are used for the power supply section, and a unique vibration isolation structure is used for fixing.
This system takes note of the fact that sound changes depending on the position and material of the belt that fixes the condenser. We have newly developed and used a unique fixing device that suppresses vibration caused by sound pressure.

14 high power transistors per channel are used for the output stage.

A printed circuit board made of glass epoxy resin is used for the main circuit board.

The front panel is equipped with an independent power meter on the left and right.
The range of the meter can be switched, ON/OFF, and the lighting can be switched in 2 stages.

Equipped with two input terminals, a variable input with volume and a fixed input.

For the AC cable, 37 copper wires with a diameter of 0.26 mm are twisted to cancel leakage flux, and a high-current capacity low-impedance cable with a double sleeve to suppress resonance is adopted.

Equipped with a waiting indicator, you can check the state of warm-up when the power is turned on.
The warm-up time is shortened to about 10 minutes by the preheat mechanism that temporarily increases the idling current.

Model Rating
Type Stereo power amplifier
Amplifier Unit
Rated Output (20 Hz to 20 kHz, Both Channel Drive) 500W + 500W (4 Ω)
370W + 370W (6 Ω)
300W + 300W (8 Ω)
Total harmonic distortion rate (20 Hz to 20 kHz) 0.005% (at rated output)
Intermodulation distortion factor (70 hz : 7 khz = 4 : 1) 0.003% (at rated output)
Power bandwidth (IHF-3dB, THD 0.2%) 5 Hz to 100 kHz
Gain 33.8dB
Frequency characteristic 1 Hz ~ 100 kHz + 0 -1.5 dB
Input sensitivity 1 V (at rated output)
0.058 V (at 1W output)
Input impedance 20k Ω
SN ratio (A correction, input short) 120 dB (at rated output)
Load impedance 1 Ω ~ 16 Ω (music)
4 Ω ~ 16 Ω (Electrical Appliance and Material Control Law Standard Continuous)
Damping factor 300 (8 Ω, 50 Hz)
Input terminal Variable : 1 system
Direct : 1 route
Output terminal Speaker : 2 lines
Meter Section
Range switching x1(0dB=300W)
x0.1(0dB=30W)
Indication range x1 Range : 0.01W ~ 800W
x0. 1 range : 1W ~ 80W
-40 to + 4 dB
Indication accuracy 0 ± 1 dB
-10 + / - 2 dB
-20 + / - 3 dB
Response speed 100 μ sec (∞ → 0 dB)
Return speed 1 sec (-0dB → -20dB)
<Others>
Pwer 100 VAC, 50Hz/60Hz
Power consumption 720W (Electrical Appliance and Material Control Law Standard)
160W (No Signal)
External dimensions Width 507x Height 264x Depth 512 mm
Weight 63kg