Do you want to capture the pure signal from a guitar, bass or keyboard without noise and loss of tone – even over long cable runs? If so, you need a DI box – and a high-quality one at that – to ensure your sound isn’t compromised.
BRIDGE 4A by Palmer is a 4-channel active DI box in 19" rack format for feeding unbalanced, high-impedance signals from electric instruments such as guitar, bass, keyboard or synthesizer into the microphone inputs of a mixing console. It delivers a transformer-balanced, low-impedance signal at the outputs and eliminates mains hum and interference caused by ground loops. This keeps the sound uncoloured: brilliant, quiet and free from interference.
Each channel features a 6.3 mm jack input, a THRU out (to pass the input signal on to e.g. an amplifier) and two transformer-balanced XLR outputs – one on the front and one on the rear.
Thanks to switchable 30 dB pre-attenuation, the BRIDGE 4A can handle extremely high input levels in addition to line signals, which means it can even be inserted between an amplifier output and the speakers, for example. The Audio-over-Cat output makes it possible to route the signals from all 4 channels via a single Cat cable (Cat5e or higher). This saves materials, space and time. The active circuitry leaves the frequency response unaffected, achieves a high dynamic range and delivers a higher output level than a passive DI box.
BRIDGE 4A is the ideal solution for audio engineers, semi-professional and professional musicians, as well as recording studios that value reliable, durable products.
- Balancing and impedance matching for guitar, bass, keyboards & synthesizers
- Eliminates ground loop hum thanks to galvanic transformer isolation
- 4 independent DI boxes in a solid 19" housing (1U)
- Higher output level than a passive DI box
- THRU-output for passing the input signal
- Audio over Cat output (AES72 Type 5e) for forwarding all signals via a single Cat cable
- Pure and unaltered low-noise audio
- Handles even high-level inputs without distortion thanks to switchable -30dB pad
- Ground-lift switch for each output
- Power supply: 9V DC, center negative
- Engineered in Germany
General data
| Product type | DI boxes |
| Type | active |
| Transformer isolated | yes |
| Channels | 4 |
| Inputs | 4 |
| input type | unbalanced |
| Input connectors | 6.3 mm jack |
| Input pad | 0 dB / 30 dB |
| Number of outputs | 4 (+ 4 parallel XLR outs + AoC) |
| THRU outputs/channel | 1 |
| Output type | balanced |
| Output connectors | RJ45 |
| Output connectors | XLR |
| Cabinet material | sheet steel |
| Width | 482 mm |
| Width | 19 " |
| Depth | 90 mm |
| Height | 44 mm |
| Height | 1 U |
| Weight | 1,96 kg |
| Ground lift switch | yes |
| Operating voltage | 9 V |
| Power consumption | 2 W |
| Additional Features | AoC output with ground lift |
| Additional Features | power LED |
| Ambient temperature during operation | -20 - 70 °C |
| Relative Humidity | < 80 %, not condensing |
| Accessories (included) | external power supply PW9V |
Audio
| Max. input level (< 1% THD, 20 Hz) | + 14 dBu |
| Max. input level (< 1% THD, 1 kHz) | + 23 dBu |
| Max. output level (<1% THD, 20 Hz - 20kHz) | +19 dBu |
| Frequency response (±0,5 dB, relative 1 kHz) | 20 Hz - 20 kHz |
| Input impedance (1 kHz) | 390 kOhm |
| Output impedance (1 kHz) | 110 Ohm(s) |
| THD + N (30 Hz, +4 dBu, unity, unweighted) | < 0.0026% |
| THD + N (1 kHz, +4 dBu, unity, unweighted) | < 0.0011% |
| SNR (+4 dBu, 22 kHz BW, unity, unweighted) | 105 dB |
| IMD (SMPTE) (60 Hz / 7 kHz, 4:1, +4 dBu) | < 0.0021% |
| Transformer ratio | 1:3 |
If you have questions about this product before placing an order, please contact our staff – we get back to you as quickly as possible, and always within 24 hours on weekdays.
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