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Vented vs Sealed - Subwoofers

Sealed box

All Arendal subwoofers start with optimally damped, high Q sealed box design. Low frequency performance is accurately damped delivering a tight impulse response - the time the driver takes to stop moving after the signal has passed is very short - and rolls off at the natural sealed box rate of 12dB/octave below the combined box and driver resonant frequency. This frequency (quoted as the -3dB point for the bass extension) is somewhat higher than a vented alignment, but the roll off below a vented subwoofers -3dB point happens at 24dB/octave. On paper the vented alignment will look deeper, but the sealed subwoofer compensates with a more extended roll-off.

As with Arendal speakers, but even more so because of the even lower frequencies involved, the sealed alignment naturally suits smaller rooms and positions closer to a wall. Room gain really kicks in hard below the rooms lowest resonant frequency, delivering 6-12dB of extra gain per octave below about 40Hz. This dovetails in nicely with the sealed alignment to give a surprisingly extended and naturally flat, in-room response and in the right room, will register output down into room shaking single figure Hertz!

In all Arendal Subwoofers, we are offering options to tailor the output to suit your room and your tastes. Our Subwoofers have additional EQ (Equalisation) settings, user switchable on the rear panel. Position Two (EQ2) is just the raw response of the subwoofer, but position EQ1 adds in a little extra bass lift below 40Hz. Not enough to make the sealed subwoofer anechoically flat, but just a bit more to compensate for the lesser room reinforcement offered up in larger rooms, or rooms of more flexible studwork construction.

Of course, many will be quick to realise that this extra lift can also add additional bass in rooms that don’t really need it, turning action movie sound tracks into a bombastic bass-fest! We deliver the choices, you use them to suit your taste without worry, because our sophisticated DSP has your back protected.

Vented box

Subwoofer 1.5 and Subwoofer 3, due to it’s sheer internal volume, also offers the ability to also be used in a vented alignment. By removing the foam plug from the big slot port, low frequency output can be extended with different bass character. Damping is slightly less optimal than the sealed alignment, but the compensation is sheer sound pressure level. Maximum extension is slightly more restricted than sealed operation, but at all audible frequencies, there is a lot of output.

1723 Series Comparison Subwoofers
Woofer 13.8"
2 x 13.8" 2 x 13.8"
Enclosure High Density Fiberboard (HDF)
High Density Fiberboard (HDF)
High Density Fiberboard (HDF) High Density Fiberboard (HDF)
Amplifier Avalanche 500DSP - 500W RMS
Avalanche 500DSP - 500W RMS
Avalanche 1000DSP - 1000W RMS
Avalanche 1000DSP - 1000W RMS
Design Sealed
Sealed / vented
Sealed Sealed / vented
49.2H x 33.5W x 45D cm
63.7H x 45W x 55D cm 54.2H x 42W x 50D cm 71.2H x 50W x 60.9D cm
Weight 24.5 kg 48.1 kg 41.4 kg 60.1 kg