Measurement's report Jcally JM7MAX - Reference Audio Analyzer

Jcally JM7MAX

About this report
This is a report for professionals with a suite of test of headphone amplifier.
You can see a simple report for "dummies" with explanations of the main characteristics for Jcally JM7MAX

A suite of tests for a headphone amplifier can be applied to just a universal output without a formal presence of an amplifier, if in this mode you can connect headphones to this output. Based on the results of the tests, you can understand the real picture, is the output powerful enough or not, with the initial data on the circuitry as a "black box".

Line-out, differences from the output for headphones and speakers

Advantages and disadvantages of balanced amplifiers

Test report - general data Jcally JM7MAX (as headphone amplifier)

Frequency response, Impedance and Frequency response with standard headphones

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Voltage levels from the load at the output of the amplifier

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The main parameters of the universal block diagram of the amplifier
Average value of impedance band in 40 Hz - 15 kHz0.6ohm
Voltage:
Linear Mode / Maximum or before clipping level
5.8/5.8dBV
1.9/1.9VRMS
Current:
Linear Mode / Maximum or before clipping level
27.5/41.5dB(mA)
23.6/118.7mA


General data - Signal/Noise
RMS dBFS (C) dBFS (A) dBFS 22 - 22k UNW
Left Right Left Right Left Right Left Right
Signal/Noise, dB -110.22 -112.39 -119.02 -120.67 -117.22 -119.07 -110.22 -112.47
Noise floor level, dBV -104.45 -106.62 -113.25 -114.90 -111.45 -113.30 -104.45 -106.70
Noise floor level, µVRMS 5.99 4.66 2.17 1.80 2.68 2.16 5.99 4.62
Optimal range of volume control, dB 40.22 42.39 49.02 50.67 47.22 49.07 40.22 42.47
Maximum level at 0 dBFS, dBV 5.77 5.77

Brief information

Clicking on the graph will take you to the comparison page of different models with advanced graph display settings.





Frequency response Jcally JM7MAX (as headphone amplifier)

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Graphics setting view
Channel

Range

Channel:LeftRight
Variation in frequency response in band from 40 Hz - 15 kHz -0.1, +0.0-0.1, +0.0dB



Brief information

Clicking on the graph will take you to the comparison page of different models with advanced graph display settings.

On the frequency response comparison page, there is an export option and additional tools for adjusting the frequency response



Impedance Jcally JM7MAX (as headphone amplifier)

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Channel

Channel:LeftRight
Impedance average in band from 40 Hz - 15 kHz0.7 0.6ohm
The minimum value in band from 40 Hz - 15 kHz0.7 0.6ohm
The maximum value in band from 40 Hz - 15 kHz0.7 0.6ohm


Comparison of basic characteristics AMPs


Brief information

Clicking on the graph will take you to the comparison page of different models with advanced graph display settings.



Crosstalk Jcally JM7MAX (as headphone amplifier)

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Graphics setting view
Channel

Range

Load

Channel:LeftRight
Crosstalk @ 1 kHz @ 15.8 ohm -53.3 -53.1dB
Crosstalk @ 1 kHz @ 24.5 ohm -56.8 -56.6dB
Crosstalk @ 1 kHz @ 30.5 ohm -58.9 -58.6dB
Crosstalk @ 1 kHz @ 62.4 ohm -64.9 -64.7dB
Crosstalk @ 1 kHz @ 100.0 ohm -68.8 -68.6dB
Crosstalk @ 1 kHz @ 198.9 ohm -74.6 -74.5dB
Crosstalk @ 1 kHz @ 300.0 ohm -77.8 -77.8dB
Crosstalk @ 1 kHz @ 763.0 ohm -85.4 -85.3dB
Crosstalk @ 1 kHz @ Not loaded-104.7 -100.8dB



Brief information

Clicking on the graph will take you to the comparison page of different models with advanced graph display settings.



Crosstalk Phase Jcally JM7MAX (as headphone amplifier)

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Graphics setting view
Channel

Load




Brief information

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Frequency response Jcally JM7MAX with resistive load

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Channel

Range

Frequency response of amplifier with resistive load @ 40 Hz - 15 kHz
Channel:LeftRight
TEST 16 ? + Jcally JM7MAX 0.00.0dB
TEST 32 ? + Jcally JM7MAX 0.00.0dB
TEST 64 ? + Jcally JM7MAX 0.00.0dB
TEST 126 ? + Jcally JM7MAX 0.00.0dB
TEST 256 ? + Jcally JM7MAX 0.00.0dB
TEST 512 ? + Jcally JM7MAX 0.00.0dB



Brief information

Clicking on the graph will take you to the comparison page of different models with advanced graph display settings.

On the frequency response comparison page, there is an export option and additional tools for adjusting the frequency response



Frequency response Jcally JM7MAX loaded dynamic headphone type

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Channel

Range

Frequency response of amplifier loaded dynamic headphone type @ 40 Hz - 15 kHz
Channel:LeftRight
TEST 10000 ? + Jcally JM7MAX 0.00.0dB
Grado GH4 Limited Edition + Jcally JM7MAX 0.10.1dB



Brief information

Clicking on the graph will take you to the comparison page of different models with advanced graph display settings.

On the frequency response comparison page, there is an export option and additional tools for adjusting the frequency response



Frequency response Jcally JM7MAX loaded type balance armature headphone type

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Channel

Range

Frequency response of amplifier loaded type balance armature headphone type @ 40 Hz - 15 kHz
Channel:LeftRight
TEST 10000 ? + Jcally JM7MAX 0.00.0dB
Campfire Audio Andromeda + Jcally JM7MAX 1.21.1dB
Fearless Audio S8F Freedom + Jcally JM7MAX 1.00.9dB



Brief information

Clicking on the graph will take you to the comparison page of different models with advanced graph display settings.

On the frequency response comparison page, there is an export option and additional tools for adjusting the frequency response



THD vs load vs output voltage Jcally JM7MAX

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Graphics setting view
Channel

Load

Harmonic, number

Range

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Channel

Load

Harmonic, number

Range

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Channel

Load

Range


Brief information

Clicking on the graph will take you to the comparison page of different models with advanced graph display settings.



   

Spectrum of Total Harmonic Distortion vs Level Jcally JM7MAX (as headphone amplifier)

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Graphics setting view
Channel

Level

Range

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Channel

Level

Range

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Channel

Shift

dBm

Range

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Channel

Shift

dBV

Range




Brief information

Clicking on the graph will take you to the comparison page of different models with advanced graph display settings.



   

Spectrum of Multitone Distortion vs Level vs Load Jcally JM7MAX (as headphone amplifier)

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Channel

Level

Range

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Graphics setting view
Channel

Level

Range

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Graphics setting view
Channel

Shift

dBm

Range

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Graphics setting view
Channel

Shift

dBV

Range


Brief information

Clicking on the graph will take you to the comparison page of different models with advanced graph display settings.



   

Spectrum of IMD SMPTE vs Level Jcally JM7MAX (as headphone amplifier)

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Graphics setting view
Channel

Level

Range

Range

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Channel

Level

Range

Range

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Graphics setting view
Channel

Shift

Range

dBm

Range

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Graphics setting view
Channel

Shift

Range

dBV

Range


Brief information

Clicking on the graph will take you to the comparison page of different models with advanced graph display settings.



   

Spectrum of IMD CCIF vs Level Jcally JM7MAX (as headphone amplifier)

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Graphics setting view
Channel

Level

Range

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Graphics setting view
Channel

Level

Range

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Graphics setting view
Channel

Shift

dBm

Range

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Graphics setting view
Channel

Shift

dBV

Range


Brief information

Clicking on the graph will take you to the comparison page of different models with advanced graph display settings.





More detailed

Measurements of Jcally JM7MAX were carried out by Roman Kuznetsov on the hardware-software complex RAA.

The Jcally JM7MAX test was conducted as a black box test, without regard to cost and prestige. This is the basic principle for making measurements, measurement reports and developing tests in RAA.

I believe that it is important to do not make an absolute assessment of the device, but an aggregate assessment when working together with a headphones and taking into account external factors. This allows you to effectively reveal the potential of the entire set of devices or to make a more optimal choice of components.




Kuznetsov Roman
Founder of RAA



Known by the nickname romanrex
Аuthor of articles iXBT.com



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Jcally JM7MAX is available in reports and services. You are in a professional report.

Information for entry level users


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