Hello everyone! This was one I finished awhile back but decided to revisit and run some analysis on with an Audio Precision 555.
Unagi Transformer Equipped Unit: Measured @ 600R Zin
Noise of output: (EQ @ noon)
1/4":
Volume Off: -44.174dB
Volume Max: -24dB
DI:
Volume Off: -43.5dB
Volume Max: -44.243dB
Maximum output before clip (roughly 10% THD)
1/4": +5.332dBu
DI: +5.5dBu
SNR:
1/4": 52dB
DI: 49dB
Lowest THD before Clip: +2dBU Output knob @ Noon
FFT DI @
300Hz
1Khz
Phase relationship between 1/4" and XLR outputs:
Frequency Sweep of EQ:
Treble Sweep w/Bass off
1/4" Out
XLR:
Comparison:
Bass Sweep w/Treble off
1/4"
XLR:
Comparison:
Sweep with both knobs in same position
1/4"
XLR:
Comparative:
Sweep of HP Filter engaged EQs at 12 o'clock
1/4":
XLR:
I have to say I really like this DI. I liked it so much i built a few extra with some Jensen transformers as well. I'll get around to testing those and seeing if there are much in the way of measurable difference but we will see. I recommend this tube DI for Bass, Acoustic guitar with a built in preamp, Keys and going direct from Guitar to interface.
Unagi Transformer Equipped Unit: Measured @ 600R Zin
Noise of output: (EQ @ noon)
1/4":
Volume Off: -44.174dB
Volume Max: -24dB
DI:
Volume Off: -43.5dB
Volume Max: -44.243dB
Maximum output before clip (roughly 10% THD)
1/4": +5.332dBu
DI: +5.5dBu
SNR:
1/4": 52dB
DI: 49dB
Lowest THD before Clip: +2dBU Output knob @ Noon
FFT DI @
300Hz
1Khz
Phase relationship between 1/4" and XLR outputs:
Frequency Sweep of EQ:
Treble Sweep w/Bass off
1/4" Out
XLR:
Comparison:
Bass Sweep w/Treble off
1/4"
XLR:
Comparison:
Sweep with both knobs in same position
1/4"
XLR:
Comparative:
Sweep of HP Filter engaged EQs at 12 o'clock
1/4":
XLR:
I have to say I really like this DI. I liked it so much i built a few extra with some Jensen transformers as well. I'll get around to testing those and seeing if there are much in the way of measurable difference but we will see. I recommend this tube DI for Bass, Acoustic guitar with a built in preamp, Keys and going direct from Guitar to interface.