PAD-SO & PAD-EVOLUZIONE

PAD-SO & PAD-EVOLUZIONE

One day, a customer told me that using a BA ( balanced armature ) type CIEM, Bialbero makes slightly floor noise. Using a Dynamic type headphone, CIEM, we could not hear such noise. But as customer claimed, BA type CIEM especially FITEAR brands can hear this noise.

At beginning, I did not understand why this happen. Bialbero output circuit is very strong, can drive AKG type high impedance dynamic headphones. I did almost test using dynamic headphone for calibrate and building test just like in recording studios.

I check with FITEAR and I agree that BA type CIEM can hear this noise. Especially FITEAR has very low impedance, and this was the reason.

To eliminate this noise, the most efficient way is put a reasonable impedance match bridge between PHPA and earphone.

Again, my days of research began. I choose the best bridge circuit and TOP quality components. Raw parts are not accurate for critical phase circuit, I have to select under 0.1% order ( EVOLUZIONE type )

PAD-SO & PAD-SO EVOLUZIONE is recommended for FITEAR and similar impedance small CIEM canceling floor noise of Bialbero series PHPA. no active circuit inside, so will not damage your precious earphone in every environment.

One more very important reason!!

Because low impedance BA type CIEM are very sensitive, many of powerfull amp could not increase volume. A rotary type continuos resistor has critical problem in both start and end side of resistor material.
The best position is about from 9 O'clock to 3 O'clock. So in case using a sensitive reproducer like CIEM, we could not rotate volume to get the best position. PAD-SO and EVOLUZIONE decrease volume without
loosing any sound detail, so you can rotate volume to get the best position.

Rotate type volume in beginning of rotate, especially stereo 2ch type, in most case they do not have great phase quality. Burned carbon and oxidized metal resistor material is not stable in both end.

Using PAD-SO and EVOLUZIONE can increase your CIEM sound phase quality.


PAD-SO


PAD-EVOLUZIONE