What the maker puts in writing
- Title: “Edifier P12 Passive Bookshelf Speaker - 2-Way Speakers with Built-in Wall-Mount Bracket - Wood Color, Pair - Needs Amplifier or Receiver to Operate”
- “RECEIVER OR AMPLIFIER REQUIRED – Connect an amplifier or receiver to power these speakers to your taste. Speaker wires included. Receive and Amplifier sold separately”
- “SILK DOME TWEETERS – High quality 19mm (3/4 inch) tweeters reproduces treble in every detail”
- “4-INCH BASS DRIVERS – Balanced natural sound with the 4-inch driver and a bass reflex port to enhance bass. 6 ohm impedance”
- “WALL-MOUNT BRACKET BUILT-IN – Hang these speakers on the wall as rear surround speakers for your home theater”
Three practical things, and nobody else combines them
The warning is in the title. Needs Amplifier or Receiver to Operate.
A passive speaker has no amplifier inside. It cannot be plugged into a phone, a laptop, a television’s headphone jack or a turntable — it needs an amplifier or AV receiver, and cable to each cabinet.
At least five listings here say so somewhere. This is the only one that puts it where you cannot miss it, and then repeats it in bullet 1 with “Receive and Amplifier sold separately”.
The speaker wire is in the box. The only listing on this shelf that supplies any. The only other one that mentions cable is Micca’s COVO-S, which says the opposite: “Speaker wires are required and are not included.” The other ten are silent, which in practice means none.
The wall bracket is part of the cabinet. Not an accessory, not a keyhole — built in. Micca’s OoO and COVO-S both need “optional wall mounting brackets”; both Daytons have keyhole points; the Polk ES20 has keyholes and threaded screw inserts.
Which adds up to a sensible surround speaker
Hang these speakers on the wall as rear surround speakers for your home theater.
That is the use this product is actually built for, and the three features above are exactly what the job needs: a long cable run (included), a wall fixing (built in), and the knowledge that your AV receiver will power it (stated in the title).
At 11.2 lb (5.1 kg) a pair it is not light, so check what your wall fixing is rated for.
Nineteen millimeters is three-quarters of an inch
Worth saying plainly, since the listing gives both: “19mm (3/4 inch) tweeters”.
The shelf divides into two tweeter camps. One inch: both Daytons, the Polk XT15, the Polk ES20. Three-quarters of an inch: all four Miccas, the Polk T15, and this.
The trade runs both ways. A larger dome moves more air, distorts less at volume, and can cross over to the woofer lower — keeping midrange strain off a small woofer. A smaller dome is lighter, extends higher, and spreads treble more widely across a room.
And note that Polk sells both for the same $149: the T15 with 0.75 inches, the XT15 with a full inch.
The bass reflex port, and the alternative
A 4-inch driver and a bass reflex port to enhance bass.
A ported cabinet has a tuned opening so the air inside resonates and reinforces the low end — typically 3 to 6 dB around the tuning frequency. Below that point output collapses at around 24 dB per octave, and at high level the port can be heard chuffing.
Nine products here are ported. One is not: Dayton’s B40 at $59.98, with a “sealed acoustic suspension cabinet [giving] controlled low-end response with reduced bass distortion”.
Ported goes lower and louder. Sealed goes cleaner and stops sooner.
Six ohms, which is half of what you need to know
Impedance is the electrical load the speaker presents. Most amplifiers are specified into 8 ohms; a 6-ohm speaker draws more current, which a decent amplifier handles and a very cheap one may not.
Four products here publish impedance: this and Dayton’s B40 at 6 ohm, both Polks at 4 and 8 ohm compatibility, and both Miccas at 4–8 ohms.
The other half of the question is sensitivity — how loud the speaker goes per watt — and this listing does not publish it. Only the two Micca MB42 models do, at 85 and 86 dB, and only Dayton’s B40 publishes a recommended amplifier range (10–50 W).
What is not published
No frequency response, no sensitivity, no power handling, no crossover slope.
That last one is not a formality. The entire forty-dollar difference between Micca’s MB42 and MB42X G2 is a crossover slope — 6 dB/octave against 12 — and it is audible, because a steeper filter keeps bass out of the tweeter.
And a four-inch woofer at $108.99 sits oddly on this shelf, where Dayton’s B65 at $79.98 has a 6.5-inch one. Cone area goes as the square of the radius, so that is about two and a half times the air moved.
5,100 g and 431 × 300 × 183 mm are published.
Prices quoted in this text were read on October 4, 2026. The live price is at the top of the page.
