Signature BS-3 Bookshelf Speaker Connection Guide with Active Subwoofer

This guide helps distinguish between the included cable and the SUB OUT connector, and provides instructions on how to properly connect an active subwoofer.

I. 3.5mm-RCA cable included with the package.

The package includes a 3.5mm to dual RCA audio cable for connecting the 3.5mm output (computer/TV headphone jack/mobile phone, etc.) to the BS3 RCA input. 

Please note that the accessories include only the 3.5mm-to-RCA cable, this cable cannot be connected to the SUB OUT port on the back of the BS3. The RCA-to-RCA cable must be purchased separately.
 

II. How to connect an active subwoofer to the SUB OUT interface

The BS3's SUB OUT is a single RCA subwoofer output interface, using an RCA lotus plug with a diameter of 3.175mm (1/8 inch) . You need to purchase the appropriate cable according to the active subwoofer interface.

Option 1: Subwoofer with LFE IN / SUB IN (Recommended)
Required purchase: Single RCA male-to-male subwoofer cable

Connection: BS3 SUB OUT → Single RCA male to male cable → LFE IN / SUB IN
Option 2: Subwoofer with only LINE IN L/R
If the instruction manual supports connecting only the L end, a single RCA cable can be used; if simultaneous input from both sides is required, please purchase a 1 RCA to 2 RCA Y-type splitter.

III. Precautions

• The included 3.5mm-RCA cable is for audio input only and should not be connected to the SUB OUT. 
• If you are unsure of the interface type, please take a photo of the subwoofer's rear interface or provide the brand and model number, and we will assist you in confirming it.

If you still have questions about the connection method, please contact support@ultimea.com for assistance.