Description
The MS-4002 is a four-channel balanced audio master station that integrates a 4.0 amp system power supply in a single 1U rack-mount chassis. It provides operator audio control for intercom networks and supports both speaker-station and headset-station operation. The unit is designed for professional AV and broadcast environments that require a compact, rackable master intercom solution.
Key features include an auto-sensing headset connector that detects dynamic or electret microphones and selectable station modes for speaker or headset use. The unit offers voice-activated microphone (VOX) capability, program inputs for each channel, and a public address (PA) output with a dedicated PA key for external announcements. Controls include back-lit keys and incoming call indications for clear operator feedback.
On the technical side, the MS-4002 accepts 100 to 240 VAC mains input and supplies 4.0 amps for the system power bus. It supports balanced audio operation and can run in unbalanced mode for compatibility with legacy equipment. The front panel features advanced programming controls eliminating the need for internal DIP switches and includes an instantaneous auto-reset function.
Connectivity options include headset and microphone connections on the front panel and intercom station connections on the rear panel. The PA output can drive external amplifiers or powered speakers, and the unit can be configured to listen through external powered speakers. Clear-Com compatibility is built in to ease integration with common wired intercom infrastructures.
Typical use cases include broadcast production control rooms, live event communications, and fixed-install AV control where multiple user channels and centralized power distribution are required. The MS-4002 is expandable to support larger intercom systems and offers operator-centric controls for call handling and mic management. Its compact 1U footprint fits standard 19 inch equipment racks for space-efficient installation.
Installation is straightforward: mount the unit in a standard 19 inch rack, connect AC mains between 100 and 240 VAC, attach headsets or microphones, and connect intercom stations to the rear connectors. The front-panel programming and auto-sensing headset detection simplify setup and reduce configuration time. The MS-4002 is built for reliable daily operation in professional AV environments.
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
