• Iconic rock-solid & lifelong durability — designed for critical audio and voice recording applications in audio production, equipment monitoring and recording markets.
• Pristine Digigram audio quality — SNR >115 dBA A-weighted on inputs, THD+N <-98 dB, with 24-bit / 192 kHz A/D and D/A converters.
• 8 balanced Mic/Line inputs with high-end preamplifiers — independent switchable 48V phantom power on each input, EIN <-124 dB at Gain +56 dB.
• Zero latency FPGA-based 16×10 mixer — 16 inputs (8 analog + 8 software playback channels) and 10 outputs (2 analog + 8 software recording channels). Each output channel has its own mix from the 16 inputs.
• Multi-applications — one driver package with multi-application and multi-card API available. Up to 8 ALP-X cards manageable from one unified control panel.
• Hiccup free reliability — low profile card with standard and low profile brackets included. PCI Express x1 (x2, x4, x8, x16 compatible).
• 8 GPIs and 8 GPOs — 8 dry contact GPIs and 8 relay GPOs (0.5 A, 48 VCC).
• Inter-board synchronization — possibility to connect up to 8 ALP-X cards linked with an inter-board sync cable.

Parameter	Value
Form factor	Low profile — standard and low profile brackets included
Expansion bus	PCI Express x1 (x2, x4, x8, x16 compatible)
Dimensions	L: 168 mm × H: 69 mm × l: 20 mm
Analog inputs	8 balanced Mic/Line level inputs
Analog outputs	2 servo-balanced line outputs
A/D & D/A converters	24 bits / 192 kHz
Line — max input level / impedance	+24 dBu / >10 kΩ
Line — analog gain	-24 dB to +16 dB in 0.5 dB steps
Line — digital gain	-90 dB to +12 dB in 0.1 dB steps
Mic — max input level / impedance	+10 dBu / >10 kΩ
Mic — analog gain	0 dB to +56 dB in 0.5 dB steps
Mic — max sensitivity	0 dBfs for a -56 dBu input signal
Mic — phantom power	Switchable 48V per input
Mic — EIN	<-124 dB @ Gain +56 dB (48kHz)
Output max level / impedance	+24 dBu / <100 Ω
Digital gain (outputs)	-90 dB to +12 dB in 0.1 dB steps
On-board mixer	Zero latency FPGA-based 16×10
GPIs / GPOs	8 dry contact GPIs / 8 relay GPOs (0.5 A, 48 VCC)
Sync inputs	1× AES11 + 1× Word Clock input
Word Clock output	1×
Sample format	PCM (8, 16, 24, 32 and 32 float bits), Float IEEE754

Analog audio performance	Inputs	Outputs
SNR A-weighted	>115 dBA	>109 dBA
SNR unweighted	>112 dB	>106 dB
THD+N @22dBu / 1kHz	<-98 dB @24dBu	<-96 dB @24dBu
Crosstalk @1 kHz / @15 kHz	-128 dB / -107 dB	-127 dB / -112 dB
Frequency response @48kHz	±0.83 dB	±0.57 dB
Channel phase @1 kHz	<0.01°	<-0.02°

• Windows (from Windows 10 and Server 2019) — ASIO, WASAPI/DirectSound
• Linux — Ubuntu 20.04 kernel 5.15 · Debian 11 kernel 5.10 · RHEL 9 kernel 5.14 — ALSA, Libgpiod
• One driver package — multi-application and multi-card API available
• Digigram ALP-X Manager (Windows) — one unified control panel for the whole ALP-X range, manages up to 8 ALP-X cards
• Digigram ALP-X ASIO Settings (Windows) — intercard synchronization, select I/Os through ASIO (others can be used through WASAPI)
• Inter-board synchronization — up to 8 ALP-X cards via inter-board sync cable

What is the Digigram ALP-280E-MIC?

A multi-channel low profile PCIe sound card designed for the acquisition of analog signals from 8 audio inputs at line or microphone level, on professional PC-based audio systems. Ideal for audio production, equipment monitoring and recording markets.

What is the difference between the ALP-280E and the ALP-280E-MIC?

The ALP-280E-MIC adds microphone-level inputs with high-end preamplifiers, independent switchable 48V phantom power per input, and a mic gain range of 0 to +56 dB — making it suitable for both line and microphone sources.

Does the ALP-280E-MIC support phantom power?

Yes. 48V phantom power is switchable independently on each of the 8 mic/line inputs.

What PCIe slot does the ALP-280E-MIC require?

It uses a PCIe x1 lane and is compatible with x2, x4, x8 and x16 slots. The low profile form factor is included with both standard and low profile brackets.

Can I use multiple ALP-280E-MIC cards in one system?

Yes. Up to 8 ALP-X cards can be connected via an inter-board sync cable and managed from Digigram's unified ALP-X Manager control panel on Windows.

Does the ALP-280E-MIC work with Linux?

Yes — with ALSA and Libgpiod drivers on Ubuntu 20.04 (kernel 5.15), Debian 11 (kernel 5.10) and RHEL 9 (kernel 5.14). One driver package covers both Windows and Linux with multi-application and multi-card API available.

What cables and connectors are included?

Two 1m breakout cables are included: one analog cable with 8 female XLR and 2 male XLR connectors, and one digital cable with 1 XLR for AES11 sync, 2 BNCs for Word Clock I/O, and 2× D-Sub 25 for GPIs and GPOs.