Palmer RIVER main Passive 2-Channel Line Merger

About: Palmer RIVER main Passive 2-Channel Line Merger

Sometimes it is necessary to send two stereo signals to one device, for example, when two mixing consoles have to drive a stereo power amplifier. In practice, this is rarely possible without ground loops occurring. The Palmer main solves this type of problem. It mixes two stereo input signals via a resistor matrix, whereby the input pair A is galvanically isolated by a transformer in order to avoid ground loops.

• Merge two stereo signals on one output pair
• Allows the combination of two devices, e.g. two mixers to a PA System
• Galvanic transformer isolation of outputs
• Switchable ground lift to isolate ground loop hum
• Neutral sound
• High headroom (+20 dBu max. input level)
• Passive construction, no power supply required
• Extremely fail-safe
• Solid casing made of aluminium and steel
• Engineered in Germany

The Palmer main works purely passively. The result is a particularly low noise floor and a neutral sound. Thanks to large transformers, it can handle high-level signals up to +20 dBu without distortion. The transformers also make it possible to assign the input pair A unbalanced while the output signal remains balanced.

The passive mode of operation without a power supply makes the Palmer main particularly reliable and failure-proof. The aluminium/steel housing and XLR sockets are also best suited to the rough everyday life on stage. The Palmer main merge box solves typical sound reinforcement problems in the simplest way with uncompromised sound quality.

Tough and Durable New Design

We know that the demands of stage and studio require equipment that is not only high performing, but also rugged and durable. The River Series represents a new design philosophy that combines form and function to create audio tools that are as rugged as they are stunning. These units are built to last, with rugged metal chassis and reinforced connectors. We've tested them in the harshest conditions, so you can count on the River Series to deliver, gig after gig, session after session, year after year.

Rewritable Tour Labels

In the world of professional audio, organisation is king. Misplaced or incorrectly connected equipment can turn a flawless performance into an unforgettable disaster. That's why the River Series introduces an innovative feature: rewritable tour labels. These color coded handy labels let you customize your di-boxes, line isolators splitters & mergers, ensuring each piece is in the right place, every time whether in the busy backstage area of a rock concert or the tangled web of cables in a recording studio.

Specifications

• Audio
  • Max. input level (< 1% THD, 20 Hz): +20 dBu
  • Max. input level (< 1% THD, 1 kHz): + 32 dBu
  • Frequency response (±1 dB, relative 1 kHz): 10 Hz - 80 kHz
  • Input impedance (1 kHz): 3.3 kOhm
  • Output impedance (1 kHz): 600 Ohm(s)
  • THD (30 Hz, +4 dBu, unity, unweighted): < 0,9 %
  • THD (1 kHz, +4 dBu, unity, unweighted): < 0,02 %
  • IMD (SMPTE) (60 Hz / 7 kHz, 4:1, +4 dBu): < 0,015 %
  • Transformer ratio: 1 : 1
• General
  • Product type: Line summing unit
  • Type: passive
  • Number of channels: 2
  • Transformer isolated: Yes
  • Number of inputs: 4
  • Input type: balanced
  • Input connections: XLR
  • Number of outputs: 2
  • Output type: balanced
  • Output connections: XLR
  • Ground lift switch: Yes
  • Housing: Aluminum continuous casting
  • Ambient temperature during operation: -20 - 70 °C
  • Relative humidity: < 80%, non-condensing
  • Dimensions (HxWxD): 1.97 x 5.51 x 5.04 in (50 x 140 x 128 mm)
  • Weight: 1.76 lbs (0.8 kg)
  • Accessories (included in delivery): Labeling plate (tour label), rubber feet