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MAK-6630 Audio Analyzer
* End of sales


The MAK-6630 is an Audio Analyzer which incorporates the measurement functions of distortion, relative Value, AC/DC level and frequency in a single instrument, and also is equipped with a low distortion audio signal source (DDS method). This unit is designed for allowing a multifunction, high-performance and high speed measurements of various characteristics of stereo amplifiers, AM-FM receivers and other electronics appliances.
When this unit is combined with MEGURO's standard signal generators, wow & flutter meter, low distortion oscillator and etc., an automatic measuring system can also created. The fully microprocessor-controlled operations and standard interfaces (GP-IB, RS-232C, EXT.I/O) make this unit a measuring instrument suitable for use with various new media, as well as improving the ease of operation and efficiency of work.


Owing to the adoption of the DDS method, the frequency changing speed is very fast, from 10Hz to 110kHz, and the audio signal is very high purity (-100dB at 80kHz LPF).
In spite of one measuring system, 2-channel measurement can be capable due to the L/R signal selector circuit, and also UNBAL/BAL measurements are possible for BTL amplifiers.
High-pass filter --- 100Hz, 200Hz, 400Hz
Low-pass filter --- 30kHz, 80kHz
Pre-Low-pass filter --- 15kHz, 20kHz
Weighting network (PSOPHO) --- IEC-AUDIO, CCIR/ARM, DIN-AUDIO standards, In addition to the above filters, a user-provided filter can be inserted by connecting it to rear-panel Input/Output connectors (EXT. FILTER).
The reciprocal type high speed counter is equipped and the range is from 10Hz to 110kHz with ±5×10-5
The measuring range is from 0.03160mV to 100.0V in 7ranges and an accuracy is within ±0.4dB at 1kHz. The frequency range is from 10Hz to 110kHz.
The mesuring range is 30mV to 100V fs and an accuracy is ±0.5% of full scale.
This unit is capable of measuring distortion factors of the fundamental signal over the frequency from 10Hz to 110khz, and a high sensitivity 1.0mVrms range is provided for the dynamic range measurement of digital audio equipments.
For AC level measurements, it is possible to display input levels as the relative value referred to a reference value.
All operation functions provided on the front panel can be programmed up to 100 steps, and also the limit (GO/No-Go) judgment and memory auto-sequence functions are equipped.
This unit is provided with GP-IB, RS-232C and EXT.I/O external control interfaces as its standard equipment so that it can be converted into an automatic measuring system.


Frequencu range 10Hz to 110kHz (4 ranges)
Setting resolution 0.1Hz (10Hz to 200Hz)
1Hz (201Hz to 2kHz)
10Hz (2.01kHz to 20kHz)
100Hz (20.01kHz to 110kHz)
Setting accuracy ±2% of setting
Output channel 2-output channel
Output range 20dBV (OPEN)
14dBV (600Ω load end)
+20 to -79.9dBV (OPEN)
Resolution 0.1 dB
Accuracy ±0.4 dB (at 1 kHz)
Output impedance 600Ω
Frequency response +20dBV to -70dBV (OPEN)

±0.4dB 20Hz to 20kHz (at 1 kHz)
±0.8dB 10Hz to 110kHz (at 1 kHz)
Distortion 3.16Vrms (typ.)
Less than -100dB(10Hz to 15kHz, 80kHz BW)
Less than -90dB(15.1kHz to 20kHz, 80kHz BW)
Less than -80dB(10Hz to 110kHz, 500kHz BW)

 Frequency measurement
Frequency range 10Hz to 110kHz (AUTO/MANU)

5 digits display for 100Hz
0.01Hz for < 100Hz

Accuracy ±5×10-5 ±1 digit
Input range 25mV (rms) to 100.0V (rms)

 AC Level measurement
Measurement channel 2-CH (Switchable)
Input method Unbalance and Balanced (selectable)
Separation for 2 channels Better than 80dBb (at 1kHz)
Input impedance 100kΩ or more
Frequency range 10Hz to 110kHz
Measurement range 0.1mV to100V in 7 range(AUTO/MANU)
Unit (m) V Unit dBV Unit dBm
100.0V 40.0dBV 42.2dBm
31.6V 30.0dBV 32.2dBm
3.16V 10.0dBV 12.2dBm
316.0mV -10.0dBV -7.8dBm
31.6mV -30.0dBV -27.8dBm
3.160mV -50.0dBV -47.8dBm
0.316mV -70.0dBV -67.8dBm
Effective measuring range 0.0316mV (-90dB) to 100V (40dB)
Accuracy Within±0.4dB for 40dB to -70dB (at 1kHz)
Frequency response 40dBV to -70dBV
Within±0.8dB for 10Hz to 110kHz at 1kHz ref.
Within±0.4dB for 20Hz to 80kHz at 1kHz ref.
Measuring resolution 0.1% of full scale value for each range

 DC Level Measurement
Measurement channel


Input impedance 1MΩ or more
Range 300mV FS to 100.0V FS(4 ranges)
Accuracy ±0.5% of full scale value
Measurement resolution 0.1% of full scale value

 Distortion Measurement
Fundamental frequency range 10Hz to 110kHz(AUTO/MANU)
Measurement resolution 0.1% of full scale value for each range
Input range 7 ranges
Unit (m) V Unit dBV Unit dBm
100.0V 40.0dBV 42.2dBm
31.6V 30.0dBV 32.2dBm
10.0V 20.0dBV 22.2dBm
3.16V 10dBV 12.2dBm
1.0V 0dBV 2.2dBm
0.316V -10.0dBV -7.8dBm
0.1V -20.0dBV -17.8dBm
Measurement range display 7 ranges
Unit(%) Unit(dBV)
31.6% -10dB
10.0% -20dB
3.16% -30dB
1.0% -40dB
0.316% -50dB
0.1% -60dB
0.0316 -70dB
Residual distortion 3.16Vrms(typ.)
-100 dB Less than (10 Hz to 15 kHz 80 kHz BW)
-90 dB Less than (15.1 kHz to 20 kHz 80 kHz BW)
-80 dB Less than (10 Hz to 110 kHz 500 kHz BW)
Input level range 0.1V(rms) to 100V(rms)
Accuracy Within±1dB for 20Hz to 20kHz
Accuracy at 2nd harmonic Within±3dB for 10Hz to 110kHz
Amplifie for digital audio 60dB

• HPF 100 Hz, 200 Hz, 400 Hz
• LPF 30 kHz, 80 kHz
• PRE LPF 15 kHz, 20 kHz
Memory function 100points(Memory address 00 to 99)
Interface function GP-IB, RS-232C, EXT.I/O

 General Data
Operating temperature range 0ºC to +50ºC
Guarantee temperature range +15ºC to +35ºC
Power requirement AC 90V to AC 132V/AC 198V to 250V
Dimmensions Approx. 426 (W) × 100 (H) × 460 (D) mm
Weight Approx. 12kg

* Specifications are subject to change without notice.


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