Audio Alchemy DDP-1Preamp/DAC/Headphone amp


From the website: Inside the machined aluminum chassis are four core components: an all-analog preamplifier, a 32-bit/216-kilohertz DSD-compatible digital-to-analog converter, dual digital signal processors and a headphone amp.

The digital section of the DDP-1 incorporates dual 32/216 PCM/DSD AKM DACs (one per channel) with seven digital inputs: USB, AES/EBU, two RCA coaxial, two Toslink optical and an I2S connection for use with the Audio Alchemy DMP-1 Digital Music Player and other sources that support the Alchemy I2S format, including legacy Audio Alchemy products and some from Cambridge Audio and other brands. XLR and RCA outputs are provided, as well as a headphone amp that delivers 1 watt into 32 ohms.

The DDP-1 employs sophisticated digital processing. You can select from four output filter profiles and you can also select the output resolution. A multistage phase-locked loop (PLL) circuit reduces jitter to the picosecond level. The preamp section employs a discrete FET driver and output stages.

The DDP-1 is equipped with an external AC power supply, and can be upgraded by replacing the stock power supply with the PS-5. The PS-5 is a balanced power supply with separate feeds for analog and digital/control circuits, separate positive and negative rails for analog circuits, well as large banks of storage capacitors for better filtering of AC ripple and improved dynamics. A USB connector on the back of the DDP-1 makes firmware updates easy.

Key Features
· Internal 32/216 PCM DAC with native DSD capability
· All-analog preamp stage
· 7 digital and 3 analog inputs
· XLR, RCA and 3.5mm headphone outputs
· Remote control
Frequency response
+/-0.05 dB, 20 Hz to 20 kHz
+/-0.1 dB, 10 Hz to 80 kHz
Nominal THD+N (1 volt)
<0.001% at 10 volts output from analog input
0.009% at 7 volts from XLR output, 3.5 volts from RCA output
Signal-to-noise ratio (1 kHz) 103 dB unweighted
Maximum digital input sampling rate/bit depth:
32-bit/216-kHz on PCM
2.82 MHz (DSD64) on DSD
Headphone amp output 1 watt at 32 Ω
Input impedance 50 kΩ
Output impedance 75 Ω
Digital inputs:
AES/EBU, 2 RCA coaxial, 2 Toslink optical, I2S, aux USB for firmware updates
Analog inputs stereo XLR, 2 stereo RCA
Outputs stereo XLR and RCA, 3.5mm headphone jack 3.5mm 12V DC trigger
Digital filter profiles:
Linear phase, fast roll-off
Linear phase, slow roll-off
Minimum phase, fast roll-off
Minimum phase, slow roll-off (apodizing)
3.0 x 10.5 x 11.6 in (hwd)
8 lb