Measurement's report DIY Beta 22 - Reference Audio Analyzer

DIY Beta 22

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 DIY Beta 22

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 DIY Beta 22 (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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Average value of impedance band in 40 Hz - 15 kHz0.2ohm
Voltage:
Linear Mode / Maximum or before clipping level
12.6/12.6dBV
4.3/4.3VRMS
Current:
Linear Mode / Maximum or before clipping level
47.8/48.8dB(mA)
246.6/276.7mA





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Frequency response DIY Beta 22 (as headphone amplifier)

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Channel

Range

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



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



Impedance DIY Beta 22 (as headphone amplifier)

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Channel:LeftRight
Impedance average in band from 40 Hz - 15 kHz0.2 0.1ohm
The minimum value in band from 40 Hz - 15 kHz0.2 0.1ohm
The maximum value in band from 40 Hz - 15 kHz0.2 0.1ohm


Comparison of basic characteristics AMPs


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Crosstalk DIY Beta 22 (as headphone amplifier)

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Channel

Range

Load

Channel:LeftRight
Crosstalk @ 1 kHz @ 15.8 ohm -50.8 -50.9dB
Crosstalk @ 1 kHz @ 24.5 ohm -59.5 -59.3dB
Crosstalk @ 1 kHz @ 30.5 ohm -61.2 -61.1dB
Crosstalk @ 1 kHz @ 62.4 ohm -67.9 -67.6dB
Crosstalk @ 1 kHz @ 100.0 ohm -71.8 -71.6dB
Crosstalk @ 1 kHz @ 198.9 ohm -77.3 -76.8dB
Crosstalk @ 1 kHz @ 300.0 ohm -79.8 -79.6dB
Crosstalk @ 1 kHz @ 763.0 ohm -84.4 -84.0dB
Crosstalk @ 1 kHz @ Not loaded-88.0 -88.0dB



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Crosstalk Phase DIY Beta 22 (as headphone amplifier)

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Load




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Frequency response DIY Beta 22 with resistive load

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Range

Frequency response of amplifier with resistive load @ 40 Hz - 15 kHz
Channel:LeftRight
TEST 16 ? + DIY Beta 22 0.00.0dB
TEST 32 ? + DIY Beta 22 0.00.0dB
TEST 64 ? + DIY Beta 22 0.00.0dB
TEST 126 ? + DIY Beta 22 0.00.0dB
TEST 256 ? + DIY Beta 22 0.00.0dB
TEST 512 ? + DIY Beta 22 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 DIY Beta 22 loaded dynamic headphone type

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Range

Frequency response of amplifier loaded dynamic headphone type @ 40 Hz - 15 kHz
Channel:LeftRight
TEST 10000 ? + DIY Beta 22 0.00.0dB
Grado GH4 Limited Edition + DIY Beta 22 0.00.0dB



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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 DIY Beta 22 loaded type balance armature headphone type

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Range

Frequency response of amplifier loaded type balance armature headphone type @ 40 Hz - 15 kHz
Channel:LeftRight
TEST 10000 ? + DIY Beta 22 0.00.0dB
Campfire Audio Andromeda + DIY Beta 22 0.50.3dB
Fearless Audio S8F Freedom + DIY Beta 22 0.40.2dB



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 DIY Beta 22

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Channel

Load

Harmonic, number

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Load

Harmonic, number

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Load


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Maximum voltage output level vs load DIY Beta 22

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RAW coordinates

Power characteristics of the Voltage Current
dBVVRMSdB(mA)mA
Equivalent class A 12.64.347.8246.6
Equivalent class AB 12.64.348.8276.7
Equivalent class B 12.64.348.8276.7
Maximum mode 12.64.348.8276.7


Volume Control TypeDiscrete Analog
Optimal range of volume control56.0dB


Comparison DIY Beta 22 and another amplifiers by loudness (Volume Level)

Main characteristics of the DIY Beta 22


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Maximum voltage output level vs load DIY Beta 22

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Maximum Amplifier Voltage Level
Load Pure or equal class AOptimal or equal class ABHard or equal class BMax, before clipping
dBVVRMSdBVVRMSdBVVRMSdBVVRMS
15.8 ohm 11.83.912.83.912.83.912.83.9
24.5 ohm 11.63.812.63.812.63.812.63.8
30.5 ohm 11.63.812.63.812.63.812.63.8
62.4 ohm 11.63.812.63.812.63.812.63.8
100 ohm 12.64.312.64.312.64.312.64.3
198.9 ohm 12.64.312.64.312.64.312.64.3
300 ohm 12.64.312.64.312.64.312.64.3
763 ohm 12.64.312.64.312.64.312.64.3
Not loaded12.64.312.64.312.64.312.64.3



Maximum level of amplifier current
Load Pure or equal class AOptimal or equal class ABHard or equal class BMax, before clipping
dB(mA)mAdB(mA)mAdB(mA)mAdB(mA)mA
15.8 ohm 47.8246.548.8276.648.8276.648.8276.6
24.5 ohm 43.8154.844.8173.744.8173.744.8173.7
30.5 ohm 41.9124.542.9139.742.9139.742.9139.7
62.4 ohm 35.761.036.768.536.768.536.768.5
100 ohm 32.642.732.642.732.642.732.642.7
198.9 ohm 26.621.526.621.526.621.526.621.5
300 ohm 23.114.323.114.323.114.323.114.3
763 ohm 15.05.615.05.615.05.615.05.6


Power
Load Pure or equal class AOptimal or equal class ABHard or equal class BMax, before clipping
dBmmWdBmmWdBmmWdBmmW
15.8 ohm 29.8960.330.81208.930.81208.930.81208.9
24.5 ohm 27.7586.928.7738.828.7738.828.7738.8
30.5 ohm 26.7472.727.7595.127.7595.127.7595.1
62.4 ohm 23.7232.224.7292.424.7292.424.7292.4
100 ohm 22.6182.722.6182.722.6182.722.6182.7
198.9 ohm 19.692.019.692.019.692.019.692.0
300 ohm 17.961.017.961.017.961.017.961.0
763 ohm 13.824.013.824.013.824.013.824.0



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Spectrum of Total Harmonic Distortion vs Level DIY Beta 22 (as headphone amplifier)

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Channel

Level

Range

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Level

Range

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Shift

dBm

Range

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dBV

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Spectrum of Multitone Distortion vs Level vs Load DIY Beta 22 (as headphone amplifier)

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Level

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Level

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dBm

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Spectrum of IMD SMPTE vs Level DIY Beta 22 (as headphone amplifier)

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Level

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Level

Range

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dBm

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dBV

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Spectrum of IMD CCIF vs Level DIY Beta 22 (as headphone amplifier)

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Level

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dBm

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dBV

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More detailed

Measurements of DIY Beta 22 were carried out by Roman Kuznetsov on the hardware-software complex RAA.

The DIY Beta 22 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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