There are many customers that prefer a subwoofer with some sort of boomy bass, without perfect bass control and a bass that shakes every fixture in the listening room.
An uncompromisingly precise bass just doesn't go that low and is also - according to the design - a bit softer compared to big performers (the law of physics cannot be ignored).
For those types of customers we have two solutions: - either use a dipole subwoofer (like e.g. the Ripol) - or a closed subwoofer (like the Vifa Quad-Sub or the one we've got here)
The Sub 30 is designed in such a way that it may be used as a bass reflex subwoofer with 4 rear bass reflex tubes (distance to the rear wall minimum 10 cm) or as closed subwoofer with extremely precise bass (without bass reflex tubes or the ports are covered with foam).
It obviously makes sense to use an amplifier boasting state-of-the-art electronics. For example an amplifier with a digital sound processor (DSP), like the Omnes Audio DPA 400, giving you full control over wanted and unwanted room resonance.
The Sub 30 employs Alcone AC 10 SW8, drivers with aluminium sandwich diaphragms, showing an excellent finish and allowing - due to their medium strength magnets - tight control over the diaphragms but are also just adequate for sealed cabinets.
The Alcone AC 10 SW8 features:
On the rear side you'll notice the Omnes Audio DPA 400 amplifier module with DSP, giving you full control over the frequency response (pictured above right).
Below you'll find three totally different applications for using this subwoofer: A) The blue frequency response curve shows the bass reflex subwoofer, also representing the highest efficiency (with 85 Hz as upper cut-off frequency). B) The red frequency response curve shows the closed cabinet subwoofer that may tuned C) using the parametric equaliser to the settings as marked in green (HP=20 Hz/24dB, TP=85 Hz/12 dB, Level=3dB, EQ1 = 20Hz/1/+6dB, EQ2 = 45Hz/1/-3dB, EQ3 = 75Hz/1/-3dB).
It's clearly noticeable that the subwoofer shows totally different sound characteristics according to the setting chosen. All three sound characteristics have their own appeal according to room conditions. Their properties we have listed below.