First of all, I’m very pleased with the Fosi Audio Preamplifier.
From Fosi Audio: The P4 features three RCA inputs, one RCA output, and a pre-out, with bass and treble adjustments as well as gain control functions, and comes with a remote control. (There is also a Tone Control bypass switch.)
Second, if, like me, you’re one of the many who have a small Class D amplifier and would appreciate remote volume control and source switching, the P4 fills a gap in the market. I now have the option of placing the amplifier, streamer, CD player, and turntable where they belong and not cluttering my workspace.
Practical applications: I got into the audio hobby about three years ago and bought the recommended starter stuff: Class D amp, Sony SScS5 speakers, WiiM Mini. Since then I have branched out, adding more equipment along the same lines for different rooms, now including DACs, a headphone amp, Jamo, JBL, and Mission speakers, etc. To date, I’ve used certain DACs (Topping E50 and SMSL M300SE) to double as pre-amps but they don’t quite fill the bill.
So why the P4? It allows me to use a dedicated amp so I can choose my DAC and other source hardware that use RCA outputs. The switching works perfectly, the volume control is smooth and accurate and the tone controls do a fine job if needed (and can be bypassed with a switch on the rear of the P4).
In the intended setup, the hardware is close enough not to need more than 1 foot cable runs. Balanced XLR cables are indicated for long runs but are surplus to requirement here. Eliminating additional XLR (or TRS) inputs keeps size and price requirements down.
Fosi claims SNR and Dynamic Range of >110dB and THD of 0.003%. I have no reason to doubt this.
From Fosi Audio: The P4 features three RCA inputs, one RCA output, and a pre-out, with bass and treble adjustments as well as gain control functions, and comes with a remote control. (There is also a Tone Control bypass switch.)
Second, if, like me, you’re one of the many who have a small Class D amplifier and would appreciate remote volume control and source switching, the P4 fills a gap in the market. I now have the option of placing the amplifier, streamer, CD player, and turntable where they belong and not cluttering my workspace.
Practical applications: I got into the audio hobby about three years ago and bought the recommended starter stuff: Class D amp, Sony SScS5 speakers, WiiM Mini. Since then I have branched out, adding more equipment along the same lines for different rooms, now including DACs, a headphone amp, Jamo, JBL, and Mission speakers, etc. To date, I’ve used certain DACs (Topping E50 and SMSL M300SE) to double as pre-amps but they don’t quite fill the bill.
So why the P4? It allows me to use a dedicated amp so I can choose my DAC and other source hardware that use RCA outputs. The switching works perfectly, the volume control is smooth and accurate and the tone controls do a fine job if needed (and can be bypassed with a switch on the rear of the P4).
In the intended setup, the hardware is close enough not to need more than 1 foot cable runs. Balanced XLR cables are indicated for long runs but are surplus to requirement here. Eliminating additional XLR (or TRS) inputs keeps size and price requirements down.
Fosi claims SNR and Dynamic Range of >110dB and THD of 0.003%. I have no reason to doubt this.