In this blog post I test the Fezz Audio Titania Class A/B integrated amplifier. The amplifier is on kind loan from a friend.
- Made in Poland
- Push/pull class AB1
- 3 RCA input
- 2 x 45w
Frequency response:18Hz-103kHz (-3dB)
Net weight: 17.5 kg
- KT88 x 4 (power output), ECC83 (12AX7) x 2 (pre-amplifier and power drivers)
In this blog post I will provide the follow test data.
- Harmonic distortion (H2,H3,& H4)
- Intermodulation distortion, 12 band/octave test tone (IMD)
- Gedlee Metric (Gm)
I test at the following output voltages using a reactive 8ohm load.
The above voltages correlate to the following output power using the following equation.
Power = Voltage squared divided by Resistance
- 0.00045m watt
- 0.0078 watt
- 0.12 watt
- 2.00 watt
For a speaker rated at 100dB/1w sensitivity, the above power correlates to the following speaker SPL.
Gedlee Metric (Gm)
Below is an overlay of the various output voltages.
The Fezz Audio Titania seems to really hit it out of the park at the 0.25v test voltage (86dB speaker output) with very low distortion for all tests (Harmonic, IMD, Gm), however bass distortion seems elevated compared to my Meixing Mingda tube amp results found here. For example the Meixing keeps bass distortion below 0.10% while the Fezz has 0.24% for H2 and H3.
Comparing bass distortion against the Mingda we see lower distortion.
So far I've tested four amplifiers to date. If I compare the IMD of each amplifier for the 0.25v output (10kHz region), we get the following summary.
Nelson Pass ACA Mini: -74dB
Fezz Titania: -70dB
I conducted my listening test with the shallow horn speaker system No.1928 and found that the amplifier sounded very similar to the Meixing Mingda. In fact, I could not tell the difference between the two amplifiers except for the bass. I found that the Meixing Minda has tighter and more defined bass. This correlates to the objective data where we see the Fezz Audio Titania with slightly higher distortion in the bass region only.
For interest's sake, here is one of my test tracks. This song is particularly great at bringing out an amplifier's ability to sound authentic on wood instruments. Particularly at 3:22 where you can really hear the body of the violins. Both the Minda and the Fezz sounded excellent on this test track.
The Fezz Audio Titania matches the performance of my KT90 Meixing Mingda Single Ended Tube amplfiier but does not quite match the low distortion of the Nelsen Pass Amp Camp Mini, but betters the Rogers Sound Lab.