Metric Halo LIO-8 4 Channel (5-8) ULN-R Preamp Kit — an expansion module adding four ULN-R preamps to channels 5-8 of a LIO-8, requiring an already-installed 8-channel DB-25 input connector board.
The kit uses the identical preamp design found in the ULN-8, letting a LIO-8 owner reach a full 8 mic-channel configuration without a quality drop relative to Metric Halo's flagship interface. Installation applies only to units that already have the input board wired — the module itself mounts into the existing connector slot without additional signal cabling.
Low-Noise Signal Path at High Gain
Capturing quiet sources — ribbon mics, subtle vocal takes, distant-miked acoustic instruments — demands 60-90 dB of gain without lifting the noise floor of the signal chain. The ULN-R covers a gain range from -22 dB to +91.5 dB in 0.5 dB steps at ±0.05 dB precision, giving fine control instead of coarse jumps that force a re-take. Dynamic range sits at 115 dB flat (0-22.05 kHz) with a noise floor of 115 dB flat / 117.9 dB A-weighted, so pushing gain high on a quiet source doesn't add audible hiss to vocal or string tracks in the mix.Scalable System Expansion Without a New Interface
Instead of purchasing a separate 8-channel interface, a LIO-8 owner adds the 5-8 module to an existing input board and reaches a full 8 channels of ULN-8-grade mic preamps. THD across the D/A/A/D loop at -12 dBFS measures 0.0007%, and crosstalk between channels at 1 kHz stays at -110 dB — figures that matter when tracking a full band simultaneously, where every added channel needs to hold the same transparency as the first four.KEY FEATURES
- Four ULN-R preamps identical to those used in the ULN-8
- Handles dynamic, condenser, and ribbon mics plus line and instrument-level signals
- +48V phantom power, independently switchable per channel
- High rejection of RFI and common-mode noise
- Channels 5-8 require a pre-installed 8-channel DB-25 input board
TECHNICAL SPECIFICATIONS
- Model number: 003-11013
- Input impedance: 3.3 kΩ
- Dynamic range (flat, 0-22.05 kHz): 115 dB
- Dynamic range (A-weighted): 118 dB
- Gain range: -22 dB to +91.5 dB, 0.5 dB steps
- THD D/A/A/D loop @ -12 dBFS: 0.0007%
- Crosstalk @ 1 kHz: -110 dB
- Phantom power: +48V, switchable per channel
