312L - Uncategorized Heritage Audio - Free user manual and instructions
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| Product Type | Single-channel Solid-state Microphone Preamplifier |
| Brand | Heritage Audio |
| Model | 312L |
| Dimensions (W x H x D) | 19 x 1.75 x 6.5 inches (rackmount, 1U) |
| Weight | 5.5 lbs (2.5 kg) |
| Power Requirement | Internal linear power supply, 100-240 VAC, 50/60 Hz |
| Power Consumption | 15 W |
| Input | XLR (mic) and 1/4" TRS (line/hi-Z) |
| Output | XLR (line) and 1/4" TRS (unbalanced) |
| Gain Range | 15 dB to 70 dB (continuous) |
| Input Impedance | 1.2 kOhm (mic), 47 kOhm (line), 1 MOhm (Hi-Z) |
| Output Impedance | 600 Ohm (transformer balanced) |
| Frequency Response | 20 Hz - 20 kHz (±0.5 dB) |
| Equivalent Input Noise (EIN) | -127 dBu (150 Ohm source, 60 dB gain) |
| Maximum Input Level | +21 dBu (line) |
| Maximum Output Level | +26 dBu |
| Phantom Power | +48 V, switchable (global or per-channel) |
| Polarity Invert | Yes, front panel switch |
| Pad | -20 dB pad |
| High-Pass Filter | 75 Hz, 12 dB/octave |
| Construction | Steel chassis, aluminum front panel |
| Operating Temperature | 0°C to 40°C |
| Maintenance | Clean with dry cloth; do not use solvents. No user-serviceable parts inside. |
| Safety | Class I equipment; use grounded outlet. Do not expose to rain or moisture. |
| Spare Parts / Repairability | Contact Heritage Audio for service; no user replaceable fuses. |
Frequently Asked Questions - 312L Heritage Audio
How do I connect a microphone to the 312L?
Connect your microphone via XLR cable to the MIC INPUT on the rear panel. Ensure phantom power is switched on if using a condenser microphone.
How do I enable phantom power?
Press the +48V switch on the front panel. An LED will indicate that phantom power is active.
Can I use the 312L with a guitar or bass?
Yes, plug your instrument into the INSTRUMENT INPUT (1/4" jack) on the front panel. Set the input selector to Hi-Z for optimal impedance matching.
What does the -20 dB pad do?
The -20 dB PAD attenuates the input signal by 20 dB to prevent clipping when using high-output sources. Engage it when the input level is too high even at minimum gain.
How do I adjust the gain?
Turn the GAIN knob clockwise to increase gain. The range is from 15 dB to 70 dB. Start low and increase until you achieve desired level.
What is the high-pass filter for?
The HPF (high-pass filter) at 75 Hz cuts low frequencies below 75 Hz, reducing rumble or proximity effect. Engage it with the front panel switch.
How do I connect the output?
Use an XLR cable from the LINE OUTPUT to your interface or mixer. Alternatively, use a 1/4" TRS cable from the UNBALANCED OUTPUT.
Why is there no sound?
Check connections, gain settings, and phantom power if needed. Ensure the input selector matches your source (mic/line/instrument). Test with a known working cable.
Can I use the 312L with a balanced line-level source?
Yes, connect a balanced line source to the LINE INPUT (XLR) and set the input selector to LINE. Adjust gain accordingly.
How do I clean the unit?
Disconnect power. Use a soft, dry cloth to wipe the surface. Do not use any liquids or chemicals. Avoid dust by covering the unit when not in use.
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USER MANUAL 312L Heritage Audio
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Product information
Brand : Heritage Audio
Model : 312L
Category : Uncategorized