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Does the Klipsch R-121SW work with the Yamaha RX500A?

Verdict
Yes

The R-121SW has a line-level input, and the RX500A's 2 subwoofer outputs feed it.

Connection
Line-level
Sub out to its LFE input
Sub outputs
2
On the RX500A
Amplifier
200 W
Built into the R-121SW

How to connect them

  1. Run a subwoofer cable from the RX500A's sub out 1 to the R-121SW's line-level input.
  2. Set speakers to Small with an 80 Hz crossover.
  3. Run Room Correction with its microphone at your seat.

Plan the R-121SW and RX500A in your own room.

Draw your room in 3D, place both, and see every connection checked and how loud they play at your seat. Designing is free.

Build it in your room

The specs that decide it

Klipsch R-121SW

Amplifier
200 W
Low end
28 Hz
Inputs
Line
MSRP
$650 each (MSRP, September 2026)
All R-121SW specs and pairings

Yamaha RX500A

Amplifier channels
7
Subwoofer outputs
2
MSRP
$600 each (MSRP, May 2026)
All RX500A specs and pairings

Questions about the R-121SW and RX500A

Does the R-121SW connect to the RX500A?
Yes. The R-121SW has a line-level input, and the RX500A's 2 subwoofer outputs feed it.
What crossover setting should I use with the R-121SW?
Set your speakers to Small with an 80 Hz crossover: the standard starting point for a receiver and subwoofer, whichever subwoofer you use.
How do I connect the R-121SW to the RX500A?
Run a subwoofer cable from the RX500A's sub out 1 to the R-121SW's line-level input.

Swap one of them

References

  1. Klipsch R-121SW: Spec sheet, assets.klipsch.com, retrieved September 15, 2026
  2. Klipsch R-121SW: Retailer listing, bestbuy.com, retrieved September 15, 2026
  3. Yamaha RX500A: Spec sheet, usa.yamaha.com, retrieved September 15, 2026
  4. Yamaha RX500A: Manufacturer product page, usa.yamaha.com, retrieved September 15, 2026
  5. Yamaha RX500A: Manufacturer product page, usa.yamaha.com, retrieved September 15, 2026 (2)

Specs verified against the manufacturer's published data. Last checked September 15, 2026.

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