HA204p - Headphone amplifier ROLLS - Free user manual and instructions

Brand	Rolls
Model	HA204p
Product Type	Headphone Amplifier
Number of Channels	4 independent stereo channels
Inputs	2 stereo 1/4" TRS (main input, auxiliary input)
Outputs	4 stereo 1/4" TRS headphone jacks
Volume Control	Individual rotary knob for each channel
Frequency Response	20 Hz - 20 kHz ±1 dB
Headphone Impedance	32 - 600 ohms
Maximum Output Power	150 mW per channel into 32 ohms
Total Harmonic Distortion	< 0.01%
Signal-to-Noise Ratio	> 100 dB
Power Supply	12 V DC, 500 mA (external adapter included)
Dimensions (W x H x D)	8.5" x 1.75" x 6" (half rack width)
Weight	1.8 lbs (0.82 kg)
Chassis	Steel with black finish
Mounting	Rack-mountable (1U, half-rack, rack ears included)
Front Panel Indicators	Power LED (blue)
Cleaning	Wipe with a dry, soft cloth; avoid liquids
Safety	Use only supplied power adapter; keep away from moisture
Spare Parts / Repair	Contact Rolls support for authorized service

Frequently Asked Questions - HA204p ROLLS

How do I connect the HA204p to my audio source?

Use a stereo 1/4" TRS cable from your source to the Main Input on the rear panel. For a second source, use the Aux Input. Each source is mixed internally.

Why is there no sound from one headphone output?

Check that the corresponding volume knob is turned up. Also verify the headphones are fully inserted into the 1/4" jack. Try swapping headphones to isolate the issue.

Can I use both Main and Aux inputs simultaneously?

Yes, both inputs are summed internally. Adjust the source levels to achieve the desired mix.

What power supply does the HA204p require?

It requires a 12 V DC adapter with at least 500 mA. Use only the included adapter to avoid damage.

How many headphones can I connect?

Up to 4 stereo headphones, each with its own volume control. All outputs receive the same summed signal.

Can I use the HA204p with in-ear monitors?

Yes, as long as they have a 1/4" plug. The amplifier works well with impedances from 32 to 600 ohms.

What is the maximum output power?

Approximately 150 mW per channel into 32 ohms, sufficient for most headphones.

How do I mount the HA204p in a rack?

Attach the supplied rack ears to the sides using the screws provided. It occupies 1U of rack space and is half-rack width.

Why is there a humming noise?

Ensure the power adapter is not near audio cables. Try a different power outlet or use a ground loop isolator on the audio input.

How do I clean the HA204p?

Use a soft, dry cloth to wipe the front panel and chassis. Do not use solvents or abrasive cleaners.

USER MANUAL HA204p ROLLS

Thank you for your purchase of the HA204p Portable Headphone Amplifier. The HA204p drives up to four pairs of stereo headphones for high quality audio monitoring. The unit is intended for sound reinforcement, studio, choir, install, and other applications where a smaller size is desired without sacrificing audio quality.

SPECIFICATIONS

Input Impedance: 47k Ohms

Max Input Level: +13 dBV adapter, +8 dBV Battery

Input Connectors: TRS Stereo 1/8", Dual RCA

Outputs: 4 - TRS Stereo 1/8" (3.5mm)

Output Impedance: 10 Ohms each output

Max Gain: 20 dB/Channel

S/N Ratio: >90 dB

THD: < .008%

IMD (SMPTE): <.008%

Nominal Current Draw: 30 Mills Min./ 400 Mills Max.

Expected Battery Life: 8 Hours Continuos use

Frequency Response: 15-35K Hz.

Recommended Headphone Impedance: 16 to 500

Ohms.

Power: 15 VDC (Rolls Model PS27s)

Weight: .85 lb

Size: 4.5" x 1.125" x 4.5"

DESCRIPTION

INPUTS: 1/8" Stereo TRS jack, and Dual RCA jack for connection to the stereo line-level signals to be monitored.

VDC PWR: Connects to the Rolls PS27s 15VDC (outside of the barrel positive) adapter.

CHANNEL LEVELS: Knobs 1 - 4 adjusts the level of the indicated channel.

OUTPUTS 1 - 4: 1/8" (3.5mm) TRS stereo jacks for connection to headphones or earphones.

WARRANTY INFO

Please visit our web site, www.rolls.com, for the Rolls 1 Year Warranty information and registration.

HA204p Portable 4-Channel Studio Reference Headphone Amplifier 9V battery Operated

The HA204p is a full frequency response, four channel headphone monitoring device designed for the recording studio, or other professional applications like listening rooms and monitoring stations. Each output boasts a whopping 20 dB of clean channel gain.

• Stereo 1/8" and Dual RCA Inputs
• Rotary Volume controls
• AC adapter included
  • 15-35k Hz frequency response
• Lots of output level.... it's loud!

SPECIFICATIONS

Size: 4.5" x 1.125" x 4.5"

Weight: .85 lb

CE

ROLLS

Rolls Corporation

Salt Lake City, UT 6/13