Shop
Proline X PO 10D-P W UMII10 dual ported wedge, front baffle with gloss black insert, 29 by 15 inches.
Proline X PO 10D-P W UMII10 dual ported wedge, side profile with the port mouth, 15.3 inch base, 15 inches tall.

Performance Optimized · Datasheet

Dayton Audio Ultimax II UMII10 Dual Box: Ported 10" Wedge Enclosure Dual 10" Ported enclosure

Net volume
1.43 cu ft, one shared chamber (0.71 per driver)
Tuning
37.5 Hz
External dimensions
29.00" W x 15" H
Front baffle
1.5 in double baffle
Buy at Audio IntensityFactory-direct, ships from Tullahoma
Dayton Audio Ultimax II UMII10Buy at Audio Intensity
  • Alignment: 1.43 cu ft net shared, vented at 37.5 Hz, F3 40.5 Hz
  • Drivers: Pair of Dayton Audio Ultimax II UMII10 (UMII10-22), 600 W RMS each
  • Port: Triangular side slot, 23.0 sq in
  • Cabinet: 29.00" W x 15" H x 9.88/15.33" D

Spec of record

Technical specifications

SeriesProline X Performance Optimized Ported Wedge
Compatible DriverDayton Audio UMII10-22 (dual 2 ohm), quantity 2. Direct fit
External Dimensions29.00" W x 15" H, 15.33" D at the base tapering to 9.88" at the top
Internal Volume, Net1.43 cu ft, one shared chamber (0.71 per driver)
Tuning37.5 Hz
PortTriangular side slot, 23.0 sq in, 23.8 in path
AlignmentF3 40.5 Hz anechoic, ripple 1.1 dB
Driver Openings9.36 in cutout, 10.47 in recess, x2 at 7.875 / 21.125 in
Driver MountingThreaded inserts pressed at the shop to Dayton's 9.92 in bolt circle
Driver Displacement0.076 cu ft each, estimated; Dayton publish none
Parameter SourceDayton Audio spec sheet and product page
Motor Clearance0.86 in to the port panel
Bracing2 windowed C braces
MaterialLangboard Elite MDF, V-groove and dado joinery
Front Baffle1.5 in double baffle
Terminal CupOne, side mounted, pre wired 12 gauge OFC to both drivers
Acrylic InsertGloss black acrylic baffle insert standard
DampingNone, ships dry
CarpetPlush black
Shipping Weight54 lb
Warranty1 Year Limited
Built InTullahoma, Tennessee

Modelled response

Performance in this enclosure

Net airspace
1.43
cu ft
Tuning
37.5
Hz · Fb
Half power
40.5
Hz · F3, anechoic
Xmax at
8911
W RMS · 30 Hz subsonic
With NO filter
1110
W RMS · unfiltered
Port
15.3
m/s at the mouth

01Is this driver right for a ported box?

Efficiency bandwidth product places the motor before anything else is decided.

EBP = Fs ÷ Qes = 53.4
SEALED 0–50 TRANSITION 50–100 PORTED 100–150 0 50 100 150 EBP 53.4
Dayton Audio UMII10-22 · EBP 53.4
Between 50 and 100 a driver takes either load, and the choice becomes one of priorities rather than of physics. The Dayton Audio UMII10-22 reads 53.4. Ported buys output and low-end reach around tuning; sealed buys a shallower rolloff below it. This cabinet takes the first trade.

02What the box does to it

1.43 cu ft net against a 42.4 L Vas, vented at 37.5 Hz.

Fb = 37.5 Hz  ·  F3 = 40.5 Hz  ·  passband ripple 1.08 dB
20 30 50 70 100 150 200 +4 0 −4 −8 −12 −16 −20 −24 −28 −32 −36 FREQUENCY · Hz LEVEL · dB −3 dB Fb 37.5
Dayton Audio UMII10-22 · Fb 37.5 Hz, F3 40.5 Hz
Anechoic, before any cabin gain, with the 30 Hz subsonic filter already applied. The vent takes over below 38 Hz and the cone stops doing the work there, which is what holds travel down at the bottom of the passband.

03Ported vs Sealed

No sealed comparison is shown for this driver.

A ported-versus-sealed chart is only worth reading against a sealed box someone would actually build: the one we make for the driver, or the one its maker recommends. Neither exists for the Dayton Audio UMII10-22 — we do not build a sealed enclosure for it and Dayton publish no sealed volume for it — so rather than compare this cabinet against itself stuffed and sealed, a box no one would build, the comparison is left out.

04The watts that reach Xmax (in this enclosure)

Travel scales with the square root of power, so there is one wattage that puts both cones exactly on Dayton's published 20.0 mm. The two traces are the same cabinet with the subsonic filter switched on and switched off. Every power figure in this section is for the pair, split evenly.

PXmax = 8911 W with a 30 Hz subsonic  ·  1110 W with none  →  the filter is worth 8.0×
20 30 50 70 100 150 200 0 8 16 24 FREQUENCY · Hz CONE TRAVEL · mm PAST LINEAR TRAVEL · Xmax 20.0 mm 8911 W reaches Xmax here
8911 W · subsonic at 30 Hz, 24 dB/oct1110 W · no subsonic filterXmax 20.0 mm one-way, published
Each trace touches the limit and no further, because each is drawn at the exact power that puts the cone on 20.0 mm. With a 30 Hz subsonic that takes 8911 W, reached first at 27 Hz. Take the filter away and the same cabinet reaches 20.0 mm on 1110 W — the filter is worth 8.0× the safe power. A vent unloads the cone below tuning, so there is nothing holding it once the box stops loading: on a sealed build a subsonic filter is an improvement, here it is required equipment. The unfiltered trace is still rising where this chart stops at 20 Hz, so treat 1110 W as a bound rather than a floor. Every wattage on this page is a MECHANICAL limit, not an electrical one. It is the power at which the cone runs out of linear travel in this cabinet, and nothing more. What the voice coil can dissipate as heat is a separate ceiling set by the driver, not by the box — Dayton rate this one at 1200 W RMS, and that is the number that binds first here: heat stops you before travel does, so treat 1200 W as the ceiling and the travel figures above as headroom. Final wired impedance, amplifier output and how long you hold the level are all electrical questions this graph does not answer.

From the shop floor

Installer's take

Two UMII10s on 1.43 cubic feet at 37.5 Hz, one shared chamber, 40.5 Hz anechoic. The mouth runs about 15 m/s with both at 600 watts.

Drivers sit at 7.875 and 21.125 from the mouth side, braces between them, each motor inside a brace window.

Dayton print the bolt circle, so the threaded inserts are pressed into the baffle at the shop. Ships dry, subsonic near 32 Hz.

Before you order

Questions

Why is this enclosure tuned to 37.5 Hz?

This cabinet gives the pair 1.43 cubic feet in one shared chamber, 0.71 per driver, vented at 37.5 Hz through a 23.0 square inch triangular port, and reaches 40.5 Hz anechoic in a 29 by 15 inch dual wedge. The port runs 23.5 m/s in the channel and 15.3 at the flared mouth with both drivers at 600 watts, and each cone peaks at 7.3 of its 20 mm. Passband ripple is 1.1 dB.

Why the 20 degree wedge, and why rear-firing?

The rake on the back matches a factory rear seat so the cabinet sits flush and the trunk floor in front stays usable; the baffle is vertical and fires rearward, using the trunk as an acoustic extension.

Do I need a subsonic filter?

Yes. Below 37.5 Hz the port no longer controls the cones; set the filter near 32 Hz.

How much power can I run, and at what impedance?

Dayton rate the UMII10 at 600 watts RMS per driver, 1200 across the pair; aim for 420 to 600 per driver. Each UMII10-22 has two 2 ohm coils: a pair lands on 2 ohms with each woofer's coils in series and the two woofers in parallel, or 8 ohms all in series. 0.5 ohm, everything in parallel, is outside what most amplifiers are built for.

Would a sealed box be better for me?

Sealed is tighter and smaller; this ported pair reaches 40.5 Hz anechoic, which a sealed box of reasonable size cannot match on these drivers.

How does the side port work?

The port is a triangular slot along the back, 23.8 inches of path, exiting through the side panel with a rounded mouth so the air leaves without a sharp edge to chuff on.

Does this enclosure ship with polyfill?

No, and do not add any: fill in a ported box detunes it.

Are the UMII10s included?

No. This is an enclosure only, for a pair you supply. Dayton make the UMII10 in one version, dual 2 ohm (UMII10-22). You receive the cabinet in plush black carpet with the gloss black acrylic insert, the side-mounted pre-wired terminal cup and the threaded inserts already pressed.

Same series, same size

Other Performance Optimized models