Do you want to capture the pure signal from a guitar, bass or keyboard without noise or loss of tone, even over long cable runs? If so, you need a DI box – and a high-quality one – to ensure your sound isn’t compromised.
The Palmer BRIDGE 4P is a 4-channel passive DI box in 19" rack format with high-quality transformers that can handle even high levels without distortion or losing the instrument’s pure sound. Each channel is equipped with a 1/4" jack input, a THRU output (for example, to pass the input signals on to an amplifier) and two transformer-balanced XLR outputs – one on the front and one on the rear.
With a 10:1 transformation ratio, the transformers ensure optimal impedance and level matching for connecting instrument signals from guitar, bass, keyboard or synthesizer to a balanced mic input. At the same time, galvanic isolation prevents hum from ground loops, so the signal remains clean, clear and ultra-low-noise – without any kind of interference.
Thanks to switchable 30 dB pre-attenuation, BRIDGE 4P can handle extremely high input levels in addition to line signals, meaning it can even be inserted between an amplifier output and the speakers, for example. The Audio-Over-Cat output makes it possible to send the signals from all 4 channels via a single Cat cable (Cat5e or higher). This saves materials, space and time. Due to the passive design, BRIDGE 4P requires no power supply, making it extremely reliable in operation.
BRIDGE 4P 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)
- Extremely fail-safe, no power supply required
- 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
- Engineered in Germany
General data
| Product type | DI boxes |
| Type | passive |
| 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 |
| Output impedance | 30 Ohm(s) |
| Frequency response | 20 Hz - 20 kHz |
| Cabinet material | sheet steel |
| Width | 482 mm |
| Width | 19 " |
| Depth | 90 mm |
| Height | 44 mm |
| Height | 1 U |
| Weight | 1.92 kg |
| Ground lift switch | yes |
| Additional Features | AoC output with ground lift |
| Ambient temperature during operation | -20 - 70 °C |
| Relative Humidity | < 80% (non-condensing) |
Audio
| Max. input level (< 1% THD, 20 Hz) | + 21 dBu |
| Max. input level (< 1% THD, 1 kHz) | +25 dBu |
| Frequency response (±0,1 dB, relative 1 kHz) | 20 Hz - 20 kHz |
| Input impedance (1 kHz) | 27 kOhm |
| Output impedance (1 kHz) | 30 Ohm(s) |
| THD (30 Hz, +4 dBu, unity, unweighted) | < 0.029% |
| THD (1 kHz, +4 dBu, unity, unweighted) | < 0.0006% |
| IMD (SMPTE) (60 Hz / 7 kHz, 4:1, +4 dBu) | < 0.0012% |
| Transformer ratio | 1 : 10 |
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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