What does B-Stock mean for this unit?

B-Stock means this CS3 BU is fully functional with complete manufacturer warranty coverage. The unit features minor cosmetic imperfections including light wear and superficial scuff marks on the exterior casing, but these marks have zero impact on operational performance, audio quality, or structural integrity.

How many microphones can the CS3 BU control?

The CS3 BU manages up to 60 microphone stations. It includes a selectable NOM (Number Of Microphones) limitation function that restricts 1, 2, 4, or 6 simultaneous open microphones depending on your conference format and operating mode.

What operating modes does this unit offer?

The CS3 BU features four distinct modes: Override (bypasses microphone limits), Normal (standard operation), Free (unrestricted microphone access), and Request (attendees request floor access). These modes adapt to different meeting structures and control protocols.

Does the CS3 BU integrate with video systems?

Yes, the unit includes an integrated RS-232 interface for optional camera control system integration, making it scalable for hybrid meeting environments and larger installations requiring coordinated audio-visual control.

What are the power and rack requirements?

The CS3 BU fits a compact 19-inch rack chassis (19 L × 11.1 W × 3.5 H) weighing 8 lbs. It requires a standard SMPS 100–240V supply (50/60Hz) rated at 3A, with nominal power consumption of 320W and minimal static draw of only 13W.

Do I pay sales tax on this order?

We collect sales tax only on orders shipped to California. Orders shipped to any other US state are charged $0 sales tax at checkout when you buy direct from our website. On this item that is roughly $89 less out the door than the same listed price at a national retailer or on a marketplace. Marketplaces such as eBay, Reverb and Amazon collect sales tax in nearly every state as marketplace facilitators no matter who the seller is, so the same item at the same price costs less bought direct. Free US shipping and 30-day returns are included. Some states ask buyers to self-report use tax on out-of-state purchases.

AKG CS3 BU Conference Base Unit

The AKG CS3 BU is a purpose-built conference base unit engineered to manage large-scale microphone systems with rock-solid reliability and transparent audio delivery. This unit handles the technical backbone of professional conferencing setups, controlling up to 60 microphone stations with four selectable operating modes that adapt to your meeting structure. The audio path remains clean and uncolored, capturing speech with exceptional clarity while maintaining tight control over open microphone count and system feedback.

System Architecture & Control

The CS3 BU operates in four distinct modes—Override, Normal, Free, and Request—with selectable NOM (Number Of Microphones) limitation that restricts 1, 2, 4, or 6 simultaneous open microphones depending on your conference format. An integrated RS-232 interface connects optional camera control systems, making this unit scalable for hybrid meeting environments and larger installations requiring coordinated audio-visual control.

Physical Specifications & Power

Housed in a compact 19-inch chassis measuring 19" × 11.1" × 3.5" and weighing 8 lbs, the unit integrates into standard equipment racks without excessive footprint demands. Power requirements are efficient—SMPS 100–240V supply (50/60Hz) rated at 3A—with nominal consumption of 320W and static draw of only 13W, keeping operational costs predictable and heat generation minimal.

Key Features

Manages up to 60 microphone stations
Four operating modes: Override, Normal, Free, Request
NOM limitation function: selectable 1, 2, 4, or 6 simultaneous open microphones
RS-232 interface for optional camera control system integration
Compact 19-inch housing: 19" L × 11.1" W × 3.5" H
Weight: 8 lbs
Power supply: SMPS 100–240V (50/60Hz) 3A
Nominal power consumption: 320W
Static consumption: 13W
Output power: ≤90W / 24V
Color: Black
B-Stock condition with original SKU 3361H00010

The CS3 BU remains the professional standard for conference facilities that require transparent audio management and dependable control over distributed microphone systems.

This specific B-Stock unit features minor cosmetic imperfections consisting of light wear and superficial scuff marks on the exterior casing. These marks are purely superficial and have absolutely zero impact on the operational performance, audio quality, or structural integrity of the conference base unit. Acquire this professional-grade AKG conferencing solution at a significant B-Stock discount while enjoying the complete backing of full manufacturer warranty coverage.

Condition	Refurbished
Country of Manufacture	China