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Size: 53.6 x 53.6 x 53.6 cm

Frequency: From 17 Hz up to 80 Hz

Enclosure Type: Hybrid

Recommended Driver: Designed around the Lab-12, other drivers that will work: Dayton Audio SD315A-88, Dayton Audio DCS305-4, SB Acoustics SB34SWPL76-4, Infinity 1260W (discontinued).

Suitable drivers typically have an EBP between 50 - 100. Fs as low as possible, preferably below 25 Hz, Qts (0.20 - 0.5), Vas (50- 150 L) / (1.7 – 5.3 ft^3). If you're uncertain a driver is suited, PM or email me at This email address is being protected from spambots. You need JavaScript enabled to view it.

Cubo Infra: Also known as Cubo HT is a true subwoofer for Home Theater and low bass songs (https://www.youtube.com/channel/UCryRu2G55Ir8WtQhg2jsaLQ). It extends into the realm of infrasound, frequencies below 20 Hz that are felt rather than heard, nothing too much just enough to justify its name. Experience (truly) scary low sound effects in movies or voice modulating bass lines in songs. Lots of amplifier headroom is advised but only a few hundred Watts is needed to get you started.

Development: Cubo Infra is the 3th prototype in a line of hybrids aiming at low frequency reproduction down into the infra region. Made from 1 and a ¼ sheet of 18 mm MDF, it features a double baffle and an inner port wall that effectively acts as bracing.

An Imperial version is in the making, plans available on request.

Front or down-firing: Its design allows it to be placed with the driver aimed towards its audience or, with rubber feet of 2 cm (4/5”) height, in a down-firing position. This maximizes the front chamber volume, creating an acoustical low pass filter that makes it sound like it drops even lower, it can also mask mechanical driver noises.

The measurements below show the response in a corner*, in down-firing position, with a 24 dB/ octave Linkwitz-Riley low pass at 60 Hz or 80 Hz without a high pass. Based on hearing alone the response drops off quickly below 17 Hz.

* One thick stone wall, one thin stone wall and a wooden floor

Designer: Cubo15 [view profile]

Infra Front View

Infra Side View

 Infra Downfiring

1 Cubo Infra Construction Plan

2 Cubo Infra Cut sheet

 

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Cubo15's Avatar
Cubo15 replied the topic: #24970 4 months 3 weeks ago
Measurements inside a room are very sensitive to sub placement, listening position and the dimensions of the room. Placement against a solid wall or in a corner often gives the best low frequency reproduction. The measurements below show the response in a corner *, in down-firing position, with a 24 dB/ octave Linkwitz-Riley low pass at 60 Hz or 80 Hz without a high pass. Based on hearing alone the response drops off quickly below 17 Hz.

* One thick stone wall, one thin stone wall and a wooden floor

Cubo Infra measurements in room

Magenta: Microphone in close proximity, 24 dB/ octave low pass filter at 80 Hz
Purple: Microphone in close proximity, 24 dB/ octave low pass filter at 60 Hz
Turquoise: Microphone at 1 meter, 24 dB/ octave low pass filter at 60 Hz


Cubo
giveortake's Avatar
giveortake replied the topic: #24969 4 months 3 weeks ago
Size: 53.6 x 53.6 x 53.6 cm

Frequency: From 17 Hz up to 80 Hz

Enclosure Type: Hybrid

Recommended Driver: Designed around the Lab-12, other drivers that will work: Dayton Audio SD315A-88, Dayton Audio DCS305-4, SB Acoustics SB34SWPL76-4, Infinity 1260W (discontinued).