Description
The HD-RA35U is a compact four-input mixer amplifier that combines paging, background music and music-on-hold capabilities in a single chassis. It provides a 35 W Class D main output and a 4 W secondary output to serve a primary zone and a small secondary zone. The unit is engineered to minimize standby power while restoring full operation automatically when audio is present – ideal for energy-conscious installations.
Key features include a front-panel paging input with VOX or push-to-talk operation, three remotely controlled VCA volume inputs for user-accessible level control, and front-panel bass and treble tone controls. The main amplifier channel uses an analog compressor/limiter that increases apparent average output without audible artifacts. The amplifier outputs are switch-selectable to drive 4 Ohm or 8 Ohm loads on the main zone and provide a transformer-balanced 600 Ohm music-on-hold output.
Performance details include Class D amplifier stages, a compressor threshold set 2 dB below rated output, low THD, and low noise figures across balanced and unbalanced inputs. Line and mic inputs accept a wide range of levels with switch-selectable phantom power on mic channels. The system meets strict energy standards and consumes less than 1 W in standby, while soft-start and internal protection prevent clicks, pops and thermal or short-circuit damage.
Connectivity covers two balanced mic/line inputs on detachable terminal blocks, two unbalanced RCA stereo inputs summed to mono, an unbalanced amp-in RCA, dual-mono line outputs on RCA, a transformer-isolated 600 Ohm MOH output, and an effects send/return loop. A RJ45 VCA control port accepts RDL wall-mounted remotes to give users local control without running audio cables. A 24 Vdc accessory output is provided to power optional external modules.
The HD-RA35U suits paging systems, small-background-music applications, and music-on-hold integration in telephony systems. Use it in reception areas, retail spaces, small meeting rooms, or as a dedicated paging amplifier in distributed audio systems. Its VOX or contact-closure ducking ensures priority paging that reliably attenuates background sources during announcements.
Installation is installer-friendly with rear-panel gain trimmers, mic/line switching, sleep-mode delay DIP switches, and detachable speaker terminals. The included external 24 Vdc power supply simplifies mounting and service access. Robust front-panel and rear-panel indicators, remote control compatibility, and a metal chassis provide dependable operation and long-term reliability.
Free Ground Shipping
We offer free ground shipping on every purchase of $300 and more for US and US territory. Please choose "Free Ground Shipping (UPS/USPS)" option at checkout.
UPS Ground
UPS provides up-to-date tracking information. Ground service takes anywhere from 2-7 working days for delivery depending on destinations. UPS Ground does not deliver on Saturdays, Sundays or Holidays.
USPS Priority Mail/USPS Express Mail
For all shipments shipped via USPS, we offer 'DELIVERY CONFIRMATION' number with each package. Difference between tracking number provided by UPS vs USPS Delivery Confirmation number is: Delivery Confirmation status is updated when the delivery has been made or when the package has made it through major USPS stations.
Air Shipment
Air shipments, Overnight, 2nd day and 3 day select methods offer guaranteed delivery time for your shipment. If you are in hurry or in need for the items on schedule, select one of these methods. Up-to-date tracking information is provided with each Air Shipment. AVProSupply has the right to choose between Air shipments to meet or reduce delivery time. For guaranteed delivery of multiple items with expedited shipping, please contact our customer service representative for personalized assistance to get your items delivered to you when you need them.
International Customers
We offer shipping via USPS/UPS for our international customers. You can find different shipping options during checkout.
Most items ordered from AVProSupply will be shipped out from our California Warehouse. Will-Calls are only allowed with Appointment Only - Please call Customer Service to set one up between the hours of 9am to 6pm PST.
We Offer A 30-Day Money Back Guarantee:
Our main goal is to ensure your complete satisfaction with our service and products. If, for any reason, you are not 100% satisfied with your purchase, you can return it within 30 days of the purchase date for a full refund. Our 30-day money back guarantee applies to all of the products we sell, except for: TVs and monitors 20" and larger, Special Order merchandise, or any item indicated as non-returnable. Shipping is not refundable. Prior to returning your purchase, a Return Merchandise Authorization (RMA) number will be provided to you.
Refunds:
Refunds on returned items will be issued in the same payment form as received from the customer at the time of purchase. Once we receive the product and it passes inspection, we will credit your account. Please allow 3 - 6 business days for a credit to appear on your account.
Exchanges:
If the item was sent back to us for an exchange, please allow 3 - 5 business days for the replacement to be processed.
No Returns/Exchanges on the following:
- TVs and monitors 20" and larger
- Special Order merchandise
- Any item indicated on the website as non-returnable
For more information see our official Return Policy
Download Manual 
