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Proline X PO 10D-S DF RSS265HO sealed down fire enclosure, front panel on 1.75 inch feet, 30 by 8.1 inches.
Proline X PO 10D-S DF RSS265HO sealed down fire enclosure, end panel with recessed terminal cup, 15 by 8.1 inches.

Performance Optimized · Datasheet

Dayton Audio Reference RSS265HO Dual Box: Sealed 10" Down Fire Enclosure Dual 10" Sealed enclosure

Net volume
0.55 cu ft per chamber after the divider and the driver displacement
Max mounting depth
5.37 in required, 1.98 in clearance above the motor
External dimensions
30.00 in W × 8.11 in in the down fire position H × 15.00 in D
Front baffle
1.5 in double baffle, outer layer machined as a flush recess
Buy at Audio IntensityFactory-direct, ships from Tullahoma
Dayton Audio Reference RSS265HOBuy at Audio Intensity
  • Alignment: 0.55 cu ft net per chamber, Qtc 0.81, F3 44.1 Hz
  • Drivers: Pair of Dayton Audio Reference RSS265HO (RSS265HO-44 (dual 4 ohm)), 600 W RMS each, 13.25 mm Xmax, 5.37 in mounting depth
  • Chambers: Two fully separate sealed chambers, 3/4" MDF full divider, one shared side-mounted terminal cup
  • Standoffs: Included, 1.75 in, shipped uninstalled. Installed height near 9.86 in
  • Cabinet: 30.00"W x 15.00"D x 8.11"H in down fire position, excludes standoffs, square corners

Spec of record

Technical specifications

SpecificationValue
SeriesProline X Performance Optimized Down Fire
Compatible DriverDayton Audio Reference RSS265HO (RSS265HO-44 (dual 4 ohm)), quantity 2. Direct fit
ConfigurationDual 10 inch, two separate chambers, sealed down fire
Mounting PositionTrunk or cargo floor, baffle facing down on standoffs
Firing DirectionDownward. Feet ship uninstalled, so front or up firing is also possible
External Width30.00 in
External Depth15.00 in
External Height8.11 in in the down fire position, excludes standoffs
Installed Height9.86 in including the 1.75 in standoff
Internal Volume, Gross1.26 cu ft total
Internal Volume, Net Acoustic0.55 cu ft per chamber after the divider and the driver displacement
Height Set ByAirspace; clearance alone would allow a lower cabinet
Driver Mounting Depth5.37 in required, 1.98 in clearance above the motor
Floor Slot0.94 times the cone area at the 1.75 in standoff
Alignment, RSS265HO-44 (dual 4 ohm) per chamberQtc 0.809, fc 49.6 Hz, F3 44.1 Hz anechoic
Woofer Opening9.25 in, two, cut for Dayton's frame
Frame Outer Diameter10.47 in
Bolt Circle9.76 in, Dayton spec; threaded inserts pre-installed
Driver Displacement0.062 cu ft, estimated; Dayton publishes none
RSS265HO-44 (dual 4 ohm) Fs / Qts / Qes / Qms / Vas27.6 Hz / 0.45 / 0.5 / 4.42 / 34.8 L
Driver Sd352 cm2, Dayton spec
Xmax13.25 mm, one-way, as Dayton publish it
Driver Power Handling600 W RMS per driver
Wiring OptionsThis cabinet is for the Reference RSS265HO RSS265HO-44 (dual 4 ohm); a matched pair should share a coil. A pair of dual 4 ohm drivers lands on 4 ohms with each woofer's coils in series and the woofers in parallel, or 1 ohm with everything in parallel. Anything under 1 ohm, and many amplifiers at 1 ohm, is outside what the amplifier is built for, so series wiring is the safe default.
Parameter SourceDayton Audio spec sheet
MaterialLangboard Elite MDF
ConstructionCNC cut, V-groove and dado joinery, square corners
Panel Thickness0.75 in
Front Baffle1.5 in double baffle, outer layer machined as a flush recess
Internal BracingFull-height 3/4 in divider
Driver MountingThreaded inserts pre-installed at Dayton's bolt circle; stainless machine screws included
Terminal CupsOne Proline X ABS and carbon fiber composite, side mounted, pre wired 12 gauge OFC to both driver positions
StandoffsIncluded, 1.75 in, shipped uninstalled
DampingLight polyfill wall lining in both chambers, does not alter acoustic volume
CarpetPlush black
Shipping Weight39 lb
Warranty1 Year Limited
Built InTullahoma, Tennessee

Modelled response

Performance in this enclosure

Net airspace
0.55
cu ft per chamber
System Qtc
0.81
sealed
Half power
44.1
Hz · F3
Xmax at
330
W RMS · no filter
With 25 Hz subsonic
378
W RMS · +14%
Amplifier
600
W RMS recommended
This enclosure holds 0.55 cu ft net per chamber. In it the Dayton Audio RSS265HO runs a system Qtc of 0.81 with half power at 44.1 Hz, and the cone reaches its 12.3 mm travel limit at 330 W, below the driver’s 600 W thermal rating, so travel is what stops you here, not heat. Run a subsonic filter at 25 Hz and that becomes 378 W — +48 W, or 14 percent more power for the same 12.3 mm of travel.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 55.2
SEALED 0–50 TRANSITION 50–100 PORTED 100–150 0 50 100 150 RSS265HO-44 55.2
RSS265HO-44 · EBP 55.2
At 55.2 the RSS265HO sits in the transition band, not the sealed band. That is not a mismatch: a transition motor works in either alignment, and sealed buys a smaller box and a gentler roll-off at the cost of some low-end output. Stage 02 shows what this airspace actually does with it.

02What the box does to it

0.55 cu ft against a 34.8 L Vas.

α = Vas ÷ Vb = 2.23  ·  Fc = Fs√(α+1) = 50 Hz  ·  Qtc = 0.81
20 30 50 70 100 150 200 +6 +0 -6 -12 -18 -24 FREQUENCY · Hz LEVEL · dB −3 dB
RSS265HO-44 · Qtc 0.81, Fc 50 Hz, F3 44.1 Hz
The box lifts resonance from 27.6 Hz free-air to 50 Hz and half power lands at 44.1 Hz, anechoic, before any cabin gain. Parameters are Dayton Audio’s own spec sheet for each coil plotted. Driver displacement is not published and is estimated. Only the coils this listing carries are plotted; the other version falls outside a well-behaved sealed alignment in this cabinet.

03The watts that reach Xmax (in this enclosure)

Travel scales with the square root of power, so there is one wattage that puts the cone exactly on 12.3 mm — and a bigger one once a subsonic filter stops it wasting travel below the passband.

PXmax = 330 W unfiltered  →  378 W with a 25 Hz subsonic
20 30 50 70 100 150 200 0 4 8 12 FREQUENCY · Hz CONE TRAVEL · mm PAST LINEAR TRAVEL · Xmax 12.3 mm 330 W reaches Xmax here
RSS265HO-44 · 330 W, no filterRSS265HO-44 · 378 W with subsonic at 25 Hz, 24 dB/octXmax 12.3 mm one-way
Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 12.3 mm. Unfiltered that is 330 W, reached first at 24 Hz. It sits under the 600 W the driver can take thermally, so the enclosure sets the ceiling, not the voice coil. The dashed traces are the same driver behind a subsonic filter at 25 Hz, 24 dB/oct: stopping the cone wasting travel below the passband lets it take 378 W before hitting the same 12.3 mm. That is 14 percent more amplifier for the price of one filter setting.
ParamValueUnitNote
Fs27.60Hzfree-air resonance
Qts0.450RSS265HO-44
Vas34.80Lequivalent compliance
Sd349.7cm²effective piston area
Xmax12.3mmone-way, as Dayton publish it
Pe600Wcontinuous RMS
SPL83.5dB1 W / 1 m, derived from T/S

Driver parameters as published by Dayton Audio spec sheet. Curves computed against this enclosure’s actual net airspace.

From the shop floor

Installer's take

0.55 cubic feet per chamber: Qtc 0.809 on the RSS265HO-44 (dual 4 ohm), F3 44.1 Hz.

Only the RSS265HO-44 (dual 4 ohm) coil is listed. In this airspace the RSS265HO-4 (single 4 ohm) goes too dry to recommend sealed; it belongs in a ported box.

Measure the installed height, not the cabinet height: 8.11 tall on its own, 9.86 with the standoffs on the 30 by 15 footprint.

Floor slot is 0.94 times the cone area at the 1.75 standoff, under the 1.0 I like. For hard use, taller feet or front firing.

Dayton's spec sheet holds together on every check I run. Displacement is the one figure they do not give, so it is estimated.

Inserts are pressed at Dayton's bolt circle, so the driver bolts straight in. Sealed, so leave the polyfill as it is and run it at 600 watts or under per driver.

Before you order

Questions

Does this fit the Dayton Audio Reference RSS265HO, and will any other 10 inch fit?

The Reference RSS265HO, yes, in the RSS265HO-44 (dual 4 ohm) version. The baffle is cut to 9.25 in for Dayton's 10.47 in frame. The 5.37 inch motor clears the cabinet with 1.98 inch to spare. Run two of the same coil so the chambers match. This cabinet is listed for the RSS265HO-44 (dual 4 ohm) only. Dayton's RSS265HO-4 (single 4 ohm) version reads Qtc 0.59 in the same airspace, too damped to sound right sealed, so it is not offered in this enclosure.

Any other 10, no. The airspace is engineered around the Reference RSS265HO's own Qts and Vas, and a different woofer that happened to drop into the hole would not see the alignment printed on this page.

Why 0.55 cubic feet per chamber, and what alignment does it target?

0.55 cubic feet net per chamber on Dayton's published figures: the RSS265HO-44 (dual 4 ohm) reads Qtc 0.809 with resonance at 49.6 Hz and half power at 44.1 Hz. That is a touch above maximally flat: a small lift near resonance and firm midbass.

Cabinet gain in a vehicle lifts the bottom end further, so in the car this reads deeper than the anechoic figures.

What amplifier power should I run, and how should I wire it?

Dayton rates the Reference RSS265HO at 600 watts RMS per driver, so target 420 to 600 watts RMS per driver at the final load.

This cabinet is for the Reference RSS265HO RSS265HO-44 (dual 4 ohm); a matched pair should share a coil. A pair of dual 4 ohm drivers lands on 4 ohms with each woofer's coils in series and the woofers in parallel, or 1 ohm with everything in parallel. Anything under 1 ohm, and many amplifiers at 1 ohm, is outside what the amplifier is built for, so series wiring is the safe default. Confirm your amplifier's minimum stable impedance first.

How tall is this once the standoffs are on?

The cabinet is 8.11 inches tall measured in the down fire position, and that figure excludes the standoffs. The standoffs hold 1.75 inches under the baffle, so plan your space around a finished stack of roughly 9.86 inches.

The footprint is the standard Performance Optimized down fire platform, 30.00 inches wide by 15.00 deep. Height is the only dimension solved to the driver.

Why two separate chambers instead of one shared volume?

Two drivers sharing one sealed volume load each other: each driver's compression stroke becomes the pressure the other works against, which blurs the alignment either would have alone. A bonded full-height 3/4 inch divider gives each driver its own 0.55 cubic feet and its own polyfill.

It also means a failure in one driver does not unload the other, and the alignment on this page is the alignment in each chamber, not an average across a shared box.

What is the expected low-frequency extension?

Anechoic F3 is 44.1 Hz per chamber. Above Qtc 0.707 F3 sits below fc, so the response carries a small lift near resonance before it rolls off.

Those figures exclude cabin gain. In a car the cabin's transfer function adds real output below 50 Hz, so in-vehicle response runs deeper than the numbers above.

Do I need to add polyfill or damping?

No. Polyfill is already installed in both chambers as a light wall lining to control internal reflections, and the quantity is chosen so it does not change the acoustic volume.

Do not add more. Packing a sealed box with fill makes it behave as though it were larger, which walks the alignment away from the 0.55 cubic feet per chamber this cabinet was built to.

Is the driver included, and are the threaded inserts installed?

No driver. This is an enclosure only. You receive the cabinet finished in plush black carpet, one side-mounted pre-wired terminal cup to both positions, the polyfill lining already in place, the standoffs, and stainless machine screws, with the threaded inserts already pressed.

The inserts are pressed at the shop on Dayton's published bolt circle for the Reference RSS265HO, so the driver bolts straight in. The pair of Dayton Audio Reference RSS265HO is purchased separately, and the cabinet is cut direct fit to it, not a general purpose 10 inch box.

Same series, same size

Other Performance Optimized models