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Hi,
I would like to recommend a small change for those who own a Pro-Ject DAC Box FL, but are somewhat unsatisfied with the sound.
Symptom: no treble resolution at all, the audio bandwidth seems to end at the higher midrange.
I hunted for this one a bit - a more qualified person would have found the issue probably after a couple of minutes. The developer of this unit thought it wise to implement a low pass filter via capacitor to ground after the coupling cap. While this seems to be a good idea in principle (considering the ultrasonic hash coming from NOS DACs), 3.3nF do not seem to be correctly dimensioned.
I changed them for what I had and what fitted (470pF polystyrenes), and the sound became *much* better. Dynamics, treble resolution, etc. is all there.
The insulated caps are Pana FM 1000uF/25V, which hardly fit into the case.
The new caps, left and right to the output:
The old caps (on the red heat sink):
Best,
Oliver
I would like to recommend a small change for those who own a Pro-Ject DAC Box FL, but are somewhat unsatisfied with the sound.
Symptom: no treble resolution at all, the audio bandwidth seems to end at the higher midrange.
I hunted for this one a bit - a more qualified person would have found the issue probably after a couple of minutes. The developer of this unit thought it wise to implement a low pass filter via capacitor to ground after the coupling cap. While this seems to be a good idea in principle (considering the ultrasonic hash coming from NOS DACs), 3.3nF do not seem to be correctly dimensioned.
I changed them for what I had and what fitted (470pF polystyrenes), and the sound became *much* better. Dynamics, treble resolution, etc. is all there.
The insulated caps are Pana FM 1000uF/25V, which hardly fit into the case.
The new caps, left and right to the output:
The old caps (on the red heat sink):
Best,
Oliver