## Test report - general data of GoVibe Porta Tube+ Mod C4 Op-Amp as AMP mode

## General results

General results

GoVibe Porta Tube+ Mod C4 Op-Amp

GoVibe Porta Tube+ Mod C4 Op-Amp

Channel

Center/Summary

Average variation in FR in the band 40 Hz to 15 kHz, dB

-0,15, 0,06

Average value of impedance band in 40 Hz to 15 kHz, ohm

0,0

Max voltage output

V

_{RMS}dBV

Pure or equal class A

^{F.A.Q.}1,56

3,89

Optimal or equal class AB

^{F.A.Q.}2,19

6,82

Hard or equal class B

^{F.A.Q.}2,19

6,82

Max, before clipping

^{F.A.Q.}2,19

6,82

Maximum current output at loaded

ohm

mA

Pure or equal class A

^{F.A.Q.}15,8

69,62

Optimal or equal class AB

^{F.A.Q.}15,8

120,79

Hard or equal class B

^{F.A.Q.}15,8

120,79

Max, before clipping

^{F.A.Q.}15,8

120,79

Max power output

ohm

mW

dBm

Pure or equal class A

^{F.A.Q.}15,8

76,58

18,84

Optimal or equal class AB

^{F.A.Q.}15,8

230,51

23,63

Hard or equal class B

^{F.A.Q.}15,8

230,51

23,63

Max, before clipping

^{F.A.Q.}15,8

230,51

23,63

The table shows a most important technical characteristics of GoVibe Porta Tube+ Mod C4 Op-Amp

*Center channel is received by data averaging between the left and right channels

## Test conditions

- For record of test signals RAA was used ADC: E-MU 1616m
- The difference between maximum levels output unloaded GoVibe Porta Tube+ Mod C4 Op-Amp and input level 0 dBFS E-MU1616m is -11,24 dB (value level for left and right channels)
- The signal was played to the amplifier with DAC: Internal DAC
- The signal was tested with output: Jack
- Was exposed to the level of the signal: Maximum level
- The bit size/format of the test signal: PCM 24 bit
- The source of the test signal: USB
- During tests RAA software-hardware measuring complex was used galvanic isolated power transformer and was excluded the effect of ground loop in the spectra

## Detailed measurements report of technical characteristics

#### Report content

- Frequency response
- Frequency response with loaded resistors
- | Variation in frequency response dependence of load dynamic type headphones
- Frequency response vs load balance armature headphone type (one driver) | Variation in frequency response vs load balance armature headphone type (one driver)
- Crosstalk
- Impedance
- Maximum level:
**voltage from the musical power for the amplifier output**- voltage output level vs load of sine
- current output level vs load of sine
- power output level vs load of sine
- THD vs load vs output voltage

#### Spectra vs Amplitude

- Harmonic distortion spectrum vs amplitude vs loaded
- Not loaded
- Loaded 15,8 ohm
- Loaded 24,5 ohm
- Loaded 30,5 ohm
- Loaded 62,4 ohm
- Loaded 100 ohm
- Loaded 198,9 ohm
- Loaded 300 ohm
- Loaded 763 ohm
- Spectrum of IMD SMPTE vs Level
- Not loaded
- Loaded 15,8 ohm
- Loaded 24,5 ohm
- Loaded 30,5 ohm
- Loaded 62,4 ohm
- Loaded 100 ohm
- Loaded 198,9 ohm
- Loaded 300 ohm
- Loaded 763 ohm
- Spectrum of IMD CCIF vs Level
- Not loaded
- Loaded 15,8 ohm
- Loaded 24,5 ohm
- Loaded 30,5 ohm
- Loaded 62,4 ohm
- Loaded 100 ohm
- Loaded 198,9 ohm
- Loaded 300 ohm
- Loaded 763 ohm
- Spectrum of Multitone Distortion vs Level vs Load

## Brief information

## Table of measured characteristics

Recommended impedances for headphones for GoVibe Porta Tube+ Mod C4 Op-Amp

Recommended impedance for headphones from the range

8 - 1008 Ом для режима работы усилителя

8 - 1008 Ом для режима работы усилителя

Equivalent class A

^{F.A.Q.}Max, before clipping

^{F.A.Q.}For In-Ear Headphones

8 - 499 ohm

8 - 973 ohm

For Over-Ear Headphones

8 - 63 ohm

8 - 122 ohm

## Table of measured characteristics

GoVibe Porta Tube+ Mod C4 Op-Amp

Output Impedance

0.03 ohm

Power characteristics of the

Voltage

Current

Equivalent class A

^{F.A.Q.}1.56 V

3.89 dBV

_{RMS}3.89 dBV

70.56 mA

36.97 dB(mA)

36.97 dB(mA)

Equivalent class AB

^{F.A.Q.}2.19 V

6.82 dBV

_{RMS}6.82 dBV

122.40 mA

41.76 dB(mA)

41.76 dB(mA)

Equivalent class B

^{F.A.Q.}2.19 V

6.82 dBV

_{RMS}6.82 dBV

122.40 mA

41.76 dB(mA)

41.76 dB(mA)

Maximum mode

^{F.A.Q.}2.19 V

6.82 dBV

_{RMS}6.82 dBV

122.40 mA

41.76 dB(mA)

41.76 dB(mA)

## On-line comparison and selection services for GoVibe Porta Tube+ Mod C4 Op-Amp

Comparison of basic characteristics GoVibe Porta Tube+ Mod C4 Op-Amp versus other models.

Voltage, Current and Impedance

Voltage, Current and Impedance

Compare a changed frequency response the bundles of GoVibe Porta Tube+ Mod C4 Op-Amp and headphones .

Comparison of the power characteristics of GoVibe Porta Tube+ Mod C4 Op-Amp and interaction headphones.

Additional headphone compatibility analytics.

Additional headphone compatibility analytics.

The automatic selection of the optimal AMP models from GoVibe Porta Tube+ Mod C4 Op-Amp.

from the measured power parameters of the amplifying part and the measured parameters of the headphones for different purpose of use.

from the measured power parameters of the amplifying part and the measured parameters of the headphones for different purpose of use.