HA43 Pro - Headphone amplifier ROLLS - Free user manual and instructions

Product Type	4-Channel Headphone Amplifier
Brand	Rolls
Model	HA43 Pro
Input Connectors	1/4" TRS Stereo and Dual RCA
Output Connectors	4x 1/4" TRS and 4x 1/8" TRS (3.5mm)
Input Impedance	100k Ohms unbalanced
Output Impedance	51 Ohms per channel
Max Gain	20 dB per channel
Max Input Level	+14 dBV
Signal-to-Noise Ratio	>90 dB
Total Harmonic Distortion	<0.008%
Intermodulation Distortion (SMPTE)	<0.008%
Power Supply	12V DC (adapter included, Rolls PS27)
Weight	1 lb (0.45 kg)
Dimensions (W x H x D)	4.15 x 3.45 x 1.16 inches
Channel Level Controls	Sliders 1-4
Number of Headphone Outputs	4 (each with 1/4" and 1/8" jacks)
Applications	Studio, broadcast, school, sound reinforcement
Care and Cleaning	Wipe with a dry cloth
Safety	Use only the supplied 12V DC adapter
Spare Parts and Repairability	Contact Rolls for service or replacement parts
Warranty	1 year (see rolls.com for details)
Country of Origin	USA (Salt Lake City, UT)

Frequently Asked Questions - HA43 Pro ROLLS

What type of power adapter does the HA43 Pro use?

The HA43 Pro uses a 12V DC power adapter (Rolls Model PS27) with center pin positive. The adapter is included with the unit.

Can I connect both 1/4" and RCA inputs simultaneously?

Yes, the HA43 Pro has both a 1/4" TRS and dual RCA inputs. They are internally summed, so you can connect two sources simultaneously, but ensure levels are adjusted appropriately.

How many headphones can I connect?

The HA43 Pro has four independent output channels. Each channel provides both a 1/4" and 1/8" jack, so you can connect up to four pairs of headphones. Using both jacks on a single channel is not recommended as they are wired in parallel.

What is the maximum output gain?

The maximum gain per channel is 20 dB, providing clean amplification for a variety of headphones.

Is the HA43 Pro suitable for low-impedance headphones?

Yes, with an output impedance of 51 Ohms, it can drive most low-impedance headphones effectively. However, for very low impedance (<32 Ohms), the volume may need to be reduced.

Can I use the 1/8" and 1/4" outputs at the same time?

Each channel has both jacks wired in parallel, so you can use them simultaneously, but the combined load will be lower. It is safe to use both, but volume may be affected.

What is the signal-to-noise ratio of the HA43 Pro?

The signal-to-noise ratio is greater than 90 dB, ensuring low noise and clean audio output.

How do I clean the HA43 Pro?

Clean the unit with a dry, soft cloth. Do not use any liquids or abrasive cleaners. Unplug the adapter before cleaning.

What is the warranty period?

The HA43 Pro comes with a 1-year warranty from Rolls. For warranty registration and details, visit rolls.com.

Where can I find the user manual?

The user manual is available for free download in PDF format from notice-facile.com or the Rolls website. It includes specifications, setup instructions, and warranty information.

USER MANUAL HA43 Pro ROLLS

Thank you for your purchase of the HA43Pro Reference Headphone Amplifier. The HA43Pro drives up to four pairs of stereo headphones for high qualituy 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: 100k Ohms unbalanced

Max Input Level: +14 dBV

Input Connectors: TRS Stereo 1/4" phone, Dual RCA

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

Output Impedance: 51 Ohms each output

Max Gain: 20 dB/Channel

S/N Ratio: >90 dB

THD: < .008%

IMD (SMPTE): <.008%

Power: 12 VDC (Rolls Model PS27)

Weight: 1 lb (.45 kg)

Size: 4.15 x 3.45 x 1.16 (W x H x D)

DESCRIPTION

INPUTS: 1/4" Stereo TRS jack, and Dual RCA jacks for connection to the stereo line-level signals to be monitored.

12 VDC PWR: Connects to the Rolls PS27 12 VDC (outside of the barrell positive) adapter.

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

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

WARRANTY INFO

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

SCHEMATIC

... anywhere you need four channels of clean, loud headphone amplification.

STIOL

- Broadcast

- School

- Studio

HA43 Pro 4 Channel Headline Amp

4-CH. Studio Headphone Amp

HA43 Pro

ST10H

HA43 Pro

4-Channel Studio Reference Headphone Amplifier

The HA43 Pro 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 1/4" and Dual RCA Inputs
• Slider Volume controls
• AC adapter included
  • Full frequency response
• Lots of output level.... it's loud!

HA43p Headphone Amp

Rolls Corporation

Salt Lake City, UT

9/06

CE