Pro D8 - Uncategorized Radial Engineering - Free user manual and instructions
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| Product Type | 8-channel passive direct box |
| Number of Channels | 8 |
| Input Connectors | 8 x 1/4" TRS (balanced/unbalanced) |
| Output Connectors | 8 x XLR Male (balanced) |
| Frequency Response | 20 Hz - 20 kHz, ±0.5 dB |
| Dynamic Range | > 110 dB |
| THD+N | < 0.01% @ 1 kHz |
| Input Impedance | 140 kΩ (balanced), 70 kΩ (unbalanced) |
| Output Impedance | 600 Ω (balanced) |
| Maximum Input Level | +21 dBu |
| Maximum Output Level | +4 dBu (typical) |
| Ground Lift | Yes, per channel |
| Pad | -15 dB, per channel |
| Power Requirement | Passive (no power needed) |
| Dimensions (W x D x H) | 19 x 6.75 x 1.75 inches (1U rack) |
| Weight | 5.5 lbs (2.5 kg) |
| Construction | All-steel chassis, powder-coated |
| Warranty | 3 years, transferable |
| Maintenance | Periodic check of connectors; wipe with dry cloth; no internal serviceable parts |
| Safety | No user-serviceable parts; use proper cabling; avoid moisture |
| Repairability | Contact Radial for service; no schematics provided |
Frequently Asked Questions - Pro D8 Radial Engineering
What is the Radial ProD8 used for?
The Radial ProD8 is a passive direct box designed to interface multiple unbalanced instrument-level signals to balanced microphone inputs on mixing consoles, stage boxes, or recording interfaces.
Does the ProD8 require power?
No, the ProD8 is a passive direct box. It does not require any external power or batteries.
How do I use the ground lift switch?
The ground lift switch per channel disconnects the audio ground from the chassis ground to eliminate ground loop hum or buzz.
What is the -15 dB pad for?
The -15 dB pad attenuates the input signal by 15 dB for high-output instruments (like active keyboards) to prevent clipping at the console input.
Can I use the ProD8 with active instruments?
Yes, the ProD8 works with both passive and active instruments. If the output level is too high, engage the -15 dB pad.
What cables do I need?
Use standard 1/4' TS or TRS cables for inputs and XLR cables for outputs. Unbalanced sources work fine with TS cables.
How do I clean the ProD8?
Wipe the chassis with a soft dry cloth. Do not use solvents or liquids. Ensure connectors are free of dust.
Is the ProD8 rack-mountable?
Yes, it is designed for 1U rack mounting. Included rack ears attach to the front panel.
What is the warranty?
Radial Engineering offers a 3-year transferable warranty against defects. Register your product online for coverage.
Can I repair the ProD8 myself?
No, the ProD8 has no user-serviceable parts. For repairs, contact Radial or an authorized service center.
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USER MANUAL Pro D8 Radial Engineering
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Product information
Brand : Radial Engineering
Model : Pro D8
Category : Uncategorized