Bass from a cabinet rather than from a subwoofer · review
Polk Audio Monitor XT70 floorstanding speaker review
The largest speaker in Polk's Monitor XT range: 89 dB, 35 Hz–40 kHz, two passive radiators instead of a port, and a matching center and height module here.
The anchor of a matched system, and better documented than its Amazon listing suggests: Polk's own spec sheet fills in sensitivity, response and bass loading. The reason to buy it is still the range around it. Key figures: Floorstanding · top of the Monitor XT range · 1 in Terylene tweeter, two 6.5 in woofers, two 8 in passive radiators · 89 dB · 35 Hz–40 kHz. Amazon.com had an offer at $349 on October 25, 2026. Our score: 7.8/10, specification-checked.
The argument is the range, not the speaker
The Monitor XT line in this catalog includes this floorstander, the XT35 center speaker and the XT90 height module. Bought together, the front three share drivers and voicing, and a sound moving across the screen stays the same sound. That coherence is what a mixed system cannot have at any price.
What Polk publishes
The Amazon listing gives only materials and the speaker’s place in the range. Polk’s own spec sheet goes much further:
Drivers: one 1 in Terylene dome tweeter and two 6.5 in bi-laminate paper woofers, crossing over at 2,700 Hz.
Bass loading: two 8 in passive bass radiators. No port is listed.
Sensitivity: 89 dB at 1 W / 1 m.
Impedance: “compatible with 4- and 8-ohm outputs”, with no nominal figure.
Frequency response: 35 Hz to 40 kHz, published without a tolerance.
Amplifier: 25 to 200 W per channel recommended.
Size and weight: 9.25 × 40.4 × 12.5 in, 35 lb.
What is still missing
A tolerance on the frequency response. “35 Hz” without “±3 dB” or “−10 dB” does not say how much bass is left at 35 Hz. Of the figures that matter, it is the only one Polk leaves vague — and the impedance is given as compatibility rather than as a number.
The room question
A floorstander is a large cabinet, and this one is just over 40 inches tall. Because it uses passive radiators rather than a port, it is less sensitive to a nearby wall than a rear-ported tower: in a small room it can sit closer to the wall without the port chuffing or the bass ballooning as badly. Pull it out a little if the bass sounds heavy.
Where to start
A pair of these and a receiver. The XT35 center and the XT90 height modules are the next two steps, and buying them from the same range is the whole point.
Buying it in the United States
Amazon.com lists this model (ASIN B09BMX4QLD) and had an offer at $349 on October 25, 2026. The price box on this page is refreshed live and takes precedence over that figure.
In its favor, and against it
Strengths
Part of a complete range — center, height module and surrounds all match
The Terylene tweeter is shared across the range, which is what makes the front three sound alike
Passive radiators instead of a port, so there is no port noise and placement near a wall is less critical
89 dB sensitivity and 4- or 8-ohm compatibility: an entry-level receiver drives it comfortably
Compromises
Frequency response published without a tolerance, so 35 Hz says little about real bass output
Its matching advantage applies only within the Monitor XT range
At 40 in tall and 35 lb, it needs floor space a small room may not have
Specifications
Position in range
Largest model in the Monitor XT series — stated
Drivers
One 1 in Terylene dome tweeter, two 6.5 in bi-laminate paper woofers — Polk spec sheet
Bass loading
Two 8 in passive bass radiators, no port listed — Polk spec sheet
Sensitivity
89 dB (1 W at 1 m) — Polk spec sheet
Impedance
Compatible with 4- and 8-ohm outputs; no nominal figure given — Polk spec sheet
Frequency response
35 Hz – 40 kHz, no tolerance given — Polk spec sheet
Crossover
2,700 Hz — Polk spec sheet
Recommended amplifier power
25–200 W per channel — Polk spec sheet
Dimensions
9.25 × 40.4 × 12.5 in (W × H × D), 23.5 × 102.6 × 31.8 cm — Polk spec sheet
Weight
35 lb (15.9 kg) — Polk spec sheet
Matching
Same range as the XT35 center and the XT90 height module reviewed here
Amazon reference
B09BMX4QLD
EAN
0747192133351
What gets asked most
Do I need the whole range?
Not to start. A pair of these with any receiver is a good stereo system. What the range buys is a coherent path: add the XT35 center and the XT90 height modules later and the whole front behaves as one, which is not true of a mixed system.
How far from the wall?
Less critical than with a ported tower: the XT70 loads its bass with two 8 in passive radiators rather than a port, according to Polk's spec sheet. A few inches of breathing room still helps, and pulling it further out tightens the bass if it sounds boomy.
What receiver does it need?
Not much of one. At 89 dB sensitivity and with Polk listing it as compatible with both 4- and 8-ohm outputs, any mainstream AV receiver in Polk's recommended 25–200 W per channel range drives it without strain.
Our score
7.8/ 10
The anchor of a matched system, and better documented than its Amazon listing suggests: Polk's own spec sheet fills in sensitivity, response and bass loading. The reason to buy it is still the range around it.
Against the floorstanding speakers in the same bracket
Between floorstanding speakers at a nearby price. Shown: what they all state. A half-filled column says nothing.
Model
Price
Sensitivity
Frequency response
Dimensions
Weight
Polk Audio Monitor XT70 floorstanding speaker
$349
89 dB (1 W at 1 m) — Polk spec sheet
35 Hz – 40 kHz, no tolerance given — Polk spec sheet
9.25 × 40.4 × 12.5 in (W × H × D), 23.5 × 102.6 × 31.8 cm — Polk spec sheet
Amazon reports what buyers took in the month before this page was last checked: at least 50.
The figure is a floor, rounded by Amazon, and read through Keepa — it says what buyers picked, not what a maker claims.
Sources
Specifications: the manufacturer sheet and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
Two-way floor-standing tower speaker pair over 39 inches tall with dual 6.5 inch custom poly bass drivers and a 1 inch silk dome tweeter in a bass reflex cabinet, with real crossovers, 150 W power handling and upgraded gold-plated binding posts accepting banana plugs, supplied in black under the reference Classic T65-Oak
A two-way tower pair over 39 inches tall, in black, under a reference that names oak.
Best for: The black finish, which is the only thing this listing offers over its twin
Two-way floor-standing tower speaker pair over 39 inches tall with dual 6.5 inch custom poly bass drivers and a 1 inch silk dome tweeter in a bass reflex cabinet, with real crossovers, 150 W power handling and upgraded gold-plated binding posts accepting banana plugs
A two-way tower pair over 39 inches tall with dual 6.5 inch drivers and a 1 inch silk dome.
Best for: A first tower pair — the height is right and the posts are right
Three-way floorstanding tower speaker two-pack with a stated 6.5 inch driver specification and a stated 300 W power rating whose peak, program or RMS classification the listing states was not provided, supplied as two matching black cabinets
A three-way tower two-pack with a 6.5 inch driver and a 300 W rating of unstated type.
Best for: A buyer who already knows the Energy Connoisseur line and wants a matched three-way pair — this listing gives no figure to judge it on
