Is the cooling fan supposed to be running all the time?

It runs all the time. And it’s loud.

Does this system produce stereo (left and right) channels for each zone on the 70v? In the pictures, it looks like it is bridged mono sound per zone.

No. Like most 70v amps, it can only output mono.

Anyone able to manage multiple zones with in wall knob amps?

Sure, why don't you crank each zone up and install in-wall volume controls to match the speaker settings re: 70 volt, 8 ohm, etc..

I bought these speakers https://www.amazon.com/dp/b014v4cva2/ref=cm_sw_r_cp_tai_csn2db2176sm3 how many can i connect per channel?

You need 70 volt speakers. These look like 8 ohm speakers

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RCS650-6 650W 6-Zone 70V Commercial Amplifier with Bluetooth

Product ID: 389997863

Details

Brand
Rockville
Item dimensions L x W x H
19 x 16 x 4
Manufacturer
Rockville
UPC
819216028506
Voltage
100 Volts

⚡650W RMS power output

📶Bluetooth + USB/SD wireless playback

🔊6 independent zone volume controls

R22748

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎶 Amplify your space, command every zone, and never miss a beat!

TAILORED AUDIO FOR EVERY ZONE - Individually control volume across 6 zones—perfect for multi-room venues like cafes and offices.
POWER YOUR SPACE WITH 650 W RMS - Robust 70V/100V output powers up to 6 zones seamlessly for any commercial environment.
DURABLE RACK MOUNT DESIGN WITH COOLING - Compact 19" rack size with built-in cooling and clipping limiter ensures reliable, long-term performance.
PRO GRADE MIC INPUTS WITH ECHO CHIME - Three mic inputs with echo control and chime button elevate your announcements and events.
WIRELESS STREAMING MEDIA FLEXIBILITY - Bluetooth, USB, SD card, and FM tuner options keep your playlist fresh and announcements clear.

The Rockville RCS650-6 is a powerful 650W commercial amplifier designed for multi-zone audio control in professional settings. Supporting 70V, 100V, 8-ohm, and 4-ohm configurations, it features Bluetooth streaming, USB/SD playback, 3 mic inputs with echo and chime, and a durable rack-mount design with built-in cooling for reliable, high-quality sound distribution across 6 independent zones.

Specifications

ASIN	B09LXL6NC1
Best Sellers Rank	#18,036 in Electronics ( See Top 100 in Electronics ) #81 in Audio Component Amplifiers
Brand	Rockville
Built-In Media	Remote Controller
Customer Reviews	4.1 4.1 out of 5 stars (123)
Item Highlight	70V/100V/4-8 Ohm, Rack Mount, USB/SD, 3 Mic Inputs, Optical Input, Chime Function, Zone Volume Controls
Item Weight	31.7 pounds
Manufacturer	Rockville
Mfr Part Number	RCS650-6
Model Number	RCS650-6
Number of Items	1
Unit Count	1 Count
Warranty Description	1 YEAR

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