Audio & Video / bookshelf speaker
Klipsch R-50M
D0 No Radio — No radio at all. It cannot phone home.
The unplug test
There is nothing to unplug. This speaker has no power cord, no battery, and no electronics — it is a woofer, a tweeter, a crossover network, and a wooden box. Speaker wire from an amplifier or AV receiver is the only connection it has ever had, and that is also the only thing that can make it stop working.
Why this tier: The manufacturer's own spec sheet lists a single input: a pair of gold-plated binding posts. This is a fully passive loudspeaker with no internal power supply, no amplifier, and no electronics of any kind — it cannot contain a radio because it contains no active circuitry at all.
Specifications
| Account required | none |
|---|---|
| Works offline | fully |
| Forced firmware updates | no |
| Radios | none |
| FCC ID | no intentional-radiator grant found |
| Local control | none |
| Phones home | none |
| Parts available | unknown |
| Availability | in stock |
| Price band | $300-400 (seen 2026-09-02) |
| Vendor risk | 0 / 3 |
Where to buy
Open questions
- No FCC filing was searched for because a purely passive speaker with no power supply has no plausible intentional or unintentional radiator to certify — this is the case the project's sibling-control heuristic explicitly does not apply to.
Sources
Class A is primary (manual, FCC filing, teardown). Class B is corroborated community reporting. Class C is never sufficient alone.
- A https://assets.klipsch.com/product-specsheets/Reference-R-50M-Spec-Sheet.pdf
Manufacturer spec sheet: 'INPUTS: Single Gold Plated Binding Posts' is the entire connectivity section. Full driver, crossover, enclosure and dimension specs given with no power supply, no amplifier stage, no Bluetooth or Wi-Fi anywhere in the document — consistent with a fully passive design that contains no active electronics. — accessed 2026-09-02 - A https://www.klipsch.com/products/r-50m-bookshelf-speakers
Manufacturer product page confirms this is the current, in-production model in the Reference line (successor to the discontinued R-51M) and that it requires an external receiver or amplifier and speaker wire — i.e. it is passive, not powered. — accessed 2026-09-02
History
- 2026-09-02 — First published at D0.
Last verified 2026-09-02 — 4 days ago.