FURMAN HRM-16 (01) PDF Document

The FURMAN HRM-16 system consists of the HDS-16 distribution unit and one or more HRM-16 remote mixers.

HDS-16 Distribution Unit:

The HDS-16 accepts eight mono and four stereo inputs from a mixing console and routes them to each HRM-16 via a 50-pin Centronics cable. This cable also transports DC power, so the HRM-16 units do not require a separate power cable. A single HDS-16 can drive a maximum of eight HRM-16 units.

HRM-16 Remote Mixer:

The HRM-16 is a 16-channel mixer with a powerful headphone amplifier. Each HRM-16 can drive two headphone outputs, allowing sixteen musicians to be supplied with eight different mixes from one HDS-16. It features a built-in microphone and a talkback system with two communication modes (Live/Stage and Studio). It also includes a solo system that allows an engineer to automatically mute all HRM-16 sends except for a specific stereo channel and the talkback output.

The FURMAN HRM-16 system has two talkback modes designed for different situations:

Live/Stage Mode (Default):

This mode establishes communication from the HDS-16 distribution unit to all HRM-16 remote mixers, but not between the mixers themselves. An HRM-16 user must press their TALK button to speak with the HDS-16, but they will not hear other HRM-16 users or their own voice. This mode is useful for live situations to prevent feedback from adjacent stage monitors.

Studio Mode:

This mode establishes communication among all HRM-16 units and the HDS-16, functioning like an intercom system. When an HRM-16 user presses their TALK button, they can speak to all other HRM-16 users and the HDS-16. In this mode, each person will also hear their own voice. This is useful for enabling discussion between musicians and the mix engineer between takes.

Changing the talkback mode requires moving a jumper inside the HDS-16 distribution unit. Follow these steps:

Step 1. Use a Phillips screwdriver to unscrew the middle two screws located near the top of the front panel and all screws on the top of the HDS-16 unit.

Step 2. Remove the top cover. You will see the main PCB.

Step 3. Locate the jumpers in the left-front corner of the PCB. Lift the jumper from the J-2 two-pin header (the default Live/Stage mode) and move it to the J-1 header to change the talkback mode to Studio mode.

The FURMAN HRM-16 remote mixer includes the following useful features:

• local effects send and return;

• line out (mono);

• bass and treble shelving EQ controls;

• talkback level and master volume controls.

The front panel of the HDS-16 unit serves as the patch bay for all input connections. It features eight mono and four stereo inputs, with both 1/4-inch and TT connectors for each channel. All connectors are balanced and use the Tip/Ring/Sleeve (TRS) wiring convention.

Note: While both 1/4-inch and TT connectors are available for each channel, they cannot be used simultaneously for the same channel. If both connector types are used for the same channel, the TT connector will be active, and the 1/4-inch connector will be disabled.

For talkback functionality, connect the mix console’s line-level talkback-microphone output or cue send to the HDS-16’s 1/4-inch TALKBACK INPUT jack. This signal is then distributed to all connected HRM-16 units.

The SOLO feature on the HDS-16 allows musicians using the FURMAN HRM-16 to hear rough mixes, final mixes, or soloed tracks from the recording console without having to manually adjust their mixer settings. To use this feature, you must patch the mix console’s main or mix output to the HDS-16’s channel D input.

When the SOLO button on the HDS-16 front panel is pressed, all outputs to the HRM-16 units are muted except for Channel D. The SOLO ON LED will light to indicate the function is active. A remote switch can also be plugged into the 1/4-inch SOLO REMOTE SWITCH connector to turn the solo function on and off. Note that the remote and front panel switches are wired in parallel, so both must be in the off position to deactivate the function.

The GROUND lift switch on the rear panel of the HDS-16 has two positions to help eliminate hum or noise issues:

LIFT: In this position, the signal ground is separate from the chassis ground. The earth ground from the AC line cord is connected only to the chassis.

GROUNDED: In this position, the signal ground is connected to the chassis ground. This is the default setting and should be used unless there is hum or noise present in the audio signal.

The top panel of the FURMAN HRM-16 provides the following controls for creating a custom headphone mix:

• Level controls for four STEREO SOURCES (A, B, C, D);

• For each of the eight mono channels: EFFECTS SEND control, L/R pan control, and a level control;

• MASTER volume control;

• HI and LO shelving EQ controls with 12 dB of boost and cut;

• TALKBACK VOLUME control, TALK button, and a built-in microphone;

• EFFECTS RETURN level control.

To use the talkback feature, press the TALK button and speak in the direction of the built-in microphone, which is located above the button and identified by three small holes in a triangle shape. The microphone is designed to pick up voices from up to six feet away, so you do not need to speak directly into it.

The TALKBACK VOLUME control adjusts the level of the incoming talkback signal from the HDS-16. For hands-free operation, you can plug a momentary footswitch into the TALKBACK SWITCH REMOTE jack on the rear panel, which can be used in addition to or instead of the front panel TALK button.

The FURMAN HRM-16 system can be connected in two configurations. A maximum of eight HRM-16s can be driven from a single HDS-16. When connecting in series, no more than four HRM-16s should be connected from a single HDS-16 output.

Parallel: In a star configuration, each HRM-16 is connected directly to one of the six Centronics outputs on the rear of the HDS-16 distribution unit.

Series: In a daisy-chain configuration, one HRM-16 is connected directly to the HDS-16. Additional HRM-16s are then connected sequentially. Connect the “OUTPUT TO ADDITIONAL HRM-16’s” jack of the first unit to the “INPUT FROM HDS-16” jack of the next unit.

The rear panel of the FURMAN HRM-16 includes several 1/4-inch TRS connectors:

• EFFECTS SEND: This is a mono output. Connect it to an external effects processor.

• EFFECTS RETURN: These are stereo inputs (L/R) for the signal returning from the effects processor. Use the L input for a mono return, which will be panned to the center.

• LINE OUT: This is a mono, line-level output used to route the HRM-16’s mix to a monitor system. The signal from this output is affected by the MASTER VOLUME and HI/LO EQ controls.

• TALKBACK SWITCH REMOTE: Plug a momentary switch (like a footswitch) into this jack to activate the talkback function remotely.

Both the HDS-16 distribution unit and the HRM-16 remote mixers have built-in protection circuits.

HRM-16 Protection:

The headphone driver and power supply regulators are protected against over-temperature and current overloads. The power delivered from the HDS-16 is protected against over-current by PolySwitch resettable fuses inside each HRM-16. These fuses prevent a defective HRM-16 from shutting down the entire system. The fuses reset automatically after the fault is cleared and power is removed from the circuit.

HDS-16 Protection:

The regulated power delivered from the HDS-16 to the HRM-16s is protected against shorted cables by an over-current crowbar circuit. If a short occurs, the affected power supply turns off. To restore normal operation, remove the defective cable or HRM-16 and turn off the power to the HDS-16 for at least 30 seconds. The AC-line fuse is a 1-Amp Slo-Blo and should only be replaced with a fuse of the same type and rating.

The maximum recommended cable run is 200 ft. The following table details the power loss per 100 feet of cable for different headphone impedances.

HDS-16 SPECIFICATIONS

INPUTS: Balanced, 50 kΩ, 90 dB CMRR

INPUT IMPEDANCE: 50 kΩ

LINE OUTPUTS: Balanced or singled ended, 50 Ω, 68 dB OCMR

SINGLE CHANNEL GAIN: 21 dB; +4 dBu for maximum output

REMOTE SWITCH: Connect tip to ring to mute all outputs except channel D (solo function)

SIZE: 3.5″ H x 19.0″ W x 8.0″ D

WEIGHT: 9.4 lb (4.27 kg)

HRM-16 SPECIFICATIONS

LINE OUTPUTS: Balanced or single ended, 50 Ω, 68 dB OCMR

POWER OUTPUT: 750 mW at 32 Ω, 770 mW at 100 Ω, 260 mW at 600 Ω

REMOTE SWITCH: Connect tip to ring to activate the talkback microphone

SIZE: 2.9″ H x 11.0″ W x 7.0″ D

WEIGHT: 3.5 lb (1.59 kg)

HDS-16 AND HRM-16 SYSTEM SPECIFICATIONS

DISTORTION AND NOISE: < 0.002% THD+Noise, 20 Hz - 20 kHz at full rated power

DYNAMIC RANGE: > 105 dB

FREQUENCY RESPONSE: +0/-1 dB 13 Hz – 32 kHz

POWER REQUIREMENTS: HDS-16: 120 VAC, 60 Hz, 82 W; HDS-16E: 230 VAC, 50 Hz, 82 W

CROSSTALK: < -95 dB at 10 kHz