What the maker puts in writing
- “Featuring a 1” tweeter, one 6.5” Dynamic Balance driver, dual 6.5” bass radiators, and tower speakers that enhance the low end”
- “Dual 6.5” Bass Radiators deliver deep, effortless bass into the listening area”
- “Start your home theater journey with the T50 tower speakers and easily build a full 5.1 setup by adding T15 surrounds, T30 center channel, subwoofer, and home theater receiver”
- “Just connect the speaker wire to your AV receivers or stereos, and you’re ready”
- Description: “Featuring a 1” silk dome tweeter, a 6.25” composite driver, and two front-firing sub bass radiators… the T50 supports Dolby and DTS”
One driven cone, two passengers
This is the thing to understand before anything else.
One 6.5” Dynamic Balance driver, dual 6.5” bass radiators.
A passive radiator — also called a drone cone or auxiliary bass radiator — has no magnet and no voice coil. Nothing drives it electrically.
It is tuned to resonate with the volume of air inside the cabinet, so when the powered woofer moves, the pressure change moves the radiator too. The effect is the same as a port: it extends the bass below where the driven woofer alone would roll off.
The advantage over a port is real. A port is a tube of moving air, and at high excursion that air becomes turbulent — audible as chuffing, and a hard limit on output. A radiator is a cone on a surround; it does not chuff.
The disadvantage is equally real: you have one motor, not three. Looking at the baffle you would count three 6.5-inch drivers. One of them is a driver.
For comparison, Dayton’s T65 at $229.98 for a pair has two driven 6.5-inch woofers per speaker.
And the diameter is published two ways
Bullet 1: 6.5 inches. Description: 6.25 inches.
Cone area goes as the square of the radius, so 6.5 inches has about 8 percent more radiating area than 6.25 — not nothing, and not decisive.
The same two sentences also disagree about the material: “Dynamic Balance” in the bullet, “composite” in the description. Those are different kinds of statement. Dynamic Balance is Polk’s design method — analyzing where a cone’s resonances fall and shifting them out of the band the driver is asked to cover — not a material.
Front-firing radiators, which is the right direction
Two front-firing sub bass radiators.
Worth noticing, because the direction a bass opening faces decides how much the wall behind the speaker matters.
A rear-facing port or radiator pressed close to a wall is choked: airflow is restricted and the bass compresses. A front-facing one does not care.
The shelf divides interestingly on this. Focal publishes two vents — “a vent towards the front for more frontal impact, in addition to one at the back for an encompassing bass”. Fluance’s Ai81 fires downward — “down-firing bass ports for deep and natural omni-directional bass” — which couples to the floor and is likewise indifferent to walls. KEF includes port bungs, foam plugs to seal the vent when the speaker is near a wall. NHT sidesteps it entirely with a sealed box.
Four approaches, four stated rationales. This is the fifth.
The upgrade path, which is a real feature
Build a full 5.1 setup by adding T15 surrounds, T30 center channel, subwoofer, and home theater receiver.
Naming the models matters because of timbre matching. In a film mix sounds pan constantly between speakers — a car crossing frame, a voice moving off-screen. If the front and surround speakers use different drivers, the sound audibly changes tone as it travels and the illusion breaks.
Within one range the drivers share materials and voicing.
Note that the T-series path ends at 5.1: there is no T-series height module, so Atmos would need something else. On this shelf the NHT MS Tower at $749.99 has an up-firing Atmos driver built in, on its own separate terminals.
And it is the shortest real tower here
921 mm. Against Fluance Ai81,960 · Dayton 1001 · NHT 1022 · KEF 1062 · Focal 1122 · Rockville 1181 · SVS 1182 · Fluance Signature 1201 mm.
Which cuts both ways. A shorter cabinet fits a low room, a corner under a sloping ceiling, or beside a low television unit.
But Dayton gives the argument against: a tower stands tall “precisely placing the tweeter at ear level”, and a seated listener’s ears are roughly 38 to 42 inches — about 38 to 41.9 in (965 to 1,065 mm) — from the floor. At 36.3 in (921 mm) the tweeter sits slightly below that, and treble beams, so the difference is audible.
What is not published
No frequency response. KEF alone publishes one, with the only tolerance on the shelf: “37Hz (-6dB), with in-room bass extending to 26Hz”.
No sensitivity, the figure that decides loudness per watt. KEF alone gives it, at 89 dB.
No impedance, where the Rockville at $119.95 publishes 8 ohm.
No power qualifier. The title says 150W; whether that is RMS or peak is not stated. The Rockville publishes 125 W RMS and 500 W peak together, which is the only readable figure here.
No quantity stated. The title is singular — “Tower Speaker” — so a stereo pair is likely about $498. Three listings on this shelf are explicitly per speaker: KEF (“sold individually”), Focal (“sold individually”) and NHT (“single unit”).
9,231 g and 197 × 222 × 921 mm are published.
Prices quoted in this text were read on October 4, 2026. The live price is at the top of the page.
