Description
The HD-PA35X is a compact single-zone 35 W Class D power amplifier designed to deliver efficient amplified audio with low heat dissipation. It accepts an unbalanced stereo-summing RCA input and provides front-panel input gain and bass and treble tone controls. The unit includes a worldwide 24 Vdc power supply and a front-panel power/standby pushbutton.
Key features include a high-efficiency Class D output stage, a built-in analog compressor/limiter, and VCA-compatible remote level control. The compressor prevents clipping under overload conditions while preserving program dynamics, and a front-panel LED indicates compressor activity. Output impedance can be switched for 4 ohm or 8 ohm speakers to match system requirements.
Performance specifications include 35 W RMS into 4 ohms and 32 W into 8 ohms with less than 1% THD+N at rated outputs. Noise is specified at less than -75 dB at maximum gain and THD+N is under 0.5% at 1 kHz near the compressor threshold. Frequency response is flat across the audio band with tone controls offering ±10 dB treble and ±9 dB bass adjustment.
Connectivity is straightforward with unbalanced summing RCA inputs and a detachable terminal block for speaker outputs and VCA remote wiring. The VCA accepts 0 to 10 Vdc control or industry-standard 0 to 10 kΩ wall controls for remote level adjustment. Indicator LEDs show signal presence, compressor activity, and power state for quick status checks.
Typical applications include paging and background music zones, additional reinforcement for existing mixer-amplifier systems, and small meeting rooms where compact size and low thermal output are required. The analog compressor enables higher average output levels and clearer speech intelligibility when compared to a non-compressed amplifier of similar power rating. The unit is engineered and manufactured in the U.S.A.
Installation is simplified by the included universal 100-240 Vac power module that provides 24 Vdc to the amplifier chassis and a detachable terminal block for clean wiring. The metal chassis and thermal/short-circuit protection ensure reliable operation in professional environments. Front-panel controls and clear LED status make daily operation and troubleshooting quick and predictable.
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 
