Optimal Audio Cuboid Series User manual

Loudspeakers
Cuboid
Loudspeakers
USER GUIDE
>

The Optimal Audio range of
compatible audio zoners, ampliers
and loudspeakers are designed to
work together simply and effectively.
Our quick start guides will take you
through the simple connection and
set up procedure.
Cuboid consists of a series of full-
range, high-powered loudspeakers
designed to deliver great sound
at an affordable price. When used
in conjunction with the rest of
the Optimal Audio eco-system
Cuboid will surprise you with its
performance, even coverage and
professional aesthetic.
This Quick Start Guide will help
you get your loudspeakers rigged,
positioned and connected correctly.
Congratulations on your choice of Optimal Audio
for your latest sound system installation.
2/23
Cuboid
Loudspeakers
Loudspeakers
USER GUIDE
© 2022. Optimal Audio Group Ltd. (v2.2)
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Introduction
Aiming/
coverage
Overview
Horizontal
coverage
Wall mount
Connecting up
Ceiling mount
Matching
speakers/amps
Grille removal
Accessories
Badge rotation
Specications
Coverage
Horn rotation
Safety info

Cuboid 3, 3TX, 5 and 5TX
• Fixed high frequency waveguide
• Low frequency driver
• Moulded ABS cabinet
Cuboid 8, 10, 12 and 15
• Rotatable high frequency horn
• Low frequency driver
• Bass reex port
• M8 xings
• Wooden cabinet
All the speakers in the Cuboid range are full-range, 2-way loudspeakers. This
means that they have a high frequency tweeter loaded onto a waveguide, giving
increased efciency and directivity, and a low-frequency cone driver.
The loudspeaker is fed with a full-range output from an amplier and an internal
electronic cross-over network divides the signal between the high and low
frequency drivers.
Cuboid loudspeakers
3/23
Cuboid
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USER GUIDE
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Introduction
Aiming/
coverage
Overview
Horizontal
coverage
Wall mount
Connecting up
Ceiling mount
Matching
speakers/amps
Grille removal
Accessories
Badge rotation
Specications
Coverage
Horn rotation
Safety info

Cuboid can be mounted on a wall in either portrait or landscape mode using the
appropriate wall bracket or suspended from a ceiling with the appropriate
U bracket.
The above table lists the correct wall bracket for each Cuboid model, along with
the combined weight of the loudspeaker and bracket.
It is critical that the structure to which Cuboid is to be mounted is suitable
for taking the weight of the loudspeaker/bracket assembly.
It is highly recommended that a secondary safety xing be tted. This can
be achieved using a suitable rated M8 eyebolt and rated safety chain or steel
wire rope (not supplied) in the case of the Cuboid 8 and above, or with the
supplied M5 bolt and steel wire rope in the case of the Cuboid 3, 3TX, 5
and 5TX.
Cuboid model Wall bracket Combined weight U bracket Combined weight Eyebolt tting
Cuboid 3 included 1.39kg (3.06lbs) N/A N/A M5 x 1
Cuboid 3TX included 1.77kg (3.9lbs) N/A N/A M5 x 1
Cuboid 5 included 2.28kg (5.02lbs) N/A N/A M5 x 1
Cuboid 5TX included 2.66kg (4.98lbs) N/A N/A M5 x 1
Cuboid 8 A 10.64kg (23.45lbs) A 13.0kg (28.66lbs) M8 x 16
Cuboid 10 B 17.26kg (38.05lbs) B 20.0kg (44.09lbs) M8 x 21
Cuboid 12 B 21.26kg (46.87lbs) C 25.5kg (56.21lbs) M8 x 21
Cuboid 15 C 31.35kg (69.11lbs) D 35.0kg (77.16lbs) M8 x 19
4/23
Cuboid
Loudspeakers
Loudspeakers
USER GUIDE
© 2022. Optimal Audio Group Ltd. (v2.2)
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Introduction
Aiming/
coverage
Overview
Horizontal
coverage
Wall mount
Connecting up
Ceiling mount
Matching
speakers/amps
Grille removal
Accessories
Badge rotation
Specications
Coverage
Horn rotation
Safety info

Mounting Cuboid 3, 3TX, 5 and 5TX in any
orientation is easy thanks to the universal bracket
that is supplied with the loudspeaker.
It is critical that the structure to which Cuboid is
to be mounted is suitable for taking the weight
of the loudspeaker/bracket assembly. It is highly
recommended that a secondary safety xing be
tted.

The wall bracket is xed to the mounting position
by 4 screws as shown.
The orientation of the loudspeaker xing plate can
be pre-set and tightened using the supplied 4mm
hex wrench. Use the supplied 3mm hex wrench to
x the loudspeaker to the bracket.
Once the wall mounting part is xed, attach the
loudspeaker part of the bracket to the mounting
points on the back of Cuboid 3, 3TX, 5 and 5TX.
Attach the loudspeaker and bracket assembly
to the wall mount and tighten in the desired
orientation.
Wall mounting Cuboid 3, 3TX, 5 and 5TX –Portrait or landscape
5/23
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Introduction
Aiming/
coverage
Overview
Horizontal
coverage
Wall mount
Connecting up
Ceiling mount
Matching
speakers/amps
Grille removal
Accessories
Badge rotation
Specications
Coverage
Horn rotation
Safety info

Once loudspeaker position has been decided, afx
wall section of wall bracket (A, B or C depending
on Cuboid model) securely to a suitable wall
mounting point.
Position loudspeaker cabinet section of wall bracket
over the four M8 mounting points and secure with
the four bolts from the back of the cabinet.

Remove M8 xing bolts from the rear of the
loudspeaker cabinet.
Optional wall bracket mounting positions enable
greater down-tilt, using the lower four M8 bolt
position, or the loudspeaker can be mounted in
landscape mode by rotating the bracket as shown:
he loudspeaker to the bracket.
Wall mounting Cuboid 8, 10, 12 and 15 –Portrait or landscape
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Introduction
Aiming/
coverage
Overview
Horizontal
coverage
Wall mount
Connecting up
Ceiling mount
Matching
speakers/amps
Grille removal
Accessories
Badge rotation
Specications
Coverage
Horn rotation
Safety info

Lift loudspeaker into position making sure that the
two halves of wall bracket line up – the adjustable
bolt sits into the two ‘U shaped’ cups in the wall
section of the bracket.

Secure the assembly with the xed bolt in the
lower hole in the bracket – this provides the pivot
for angling the loudspeaker. Adjust the grub screw
to x the down-tilt angle.
Horizontal Fixings
Vertical Fixing
Grub Screw
Grub screw
Wall mounting Cuboid 8, 10, 12 and 15 –Portrait or landscape
Once the loudspeaker is in position and you are
happy with the angle adjustments, tighten all
xings as shown to lock the cabinet in place.
7/23
Cuboid
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Introduction
Aiming/
coverage
Overview
Horizontal
coverage
Wall mount
Connecting up
Ceiling mount
Matching
speakers/amps
Grille removal
Accessories
Badge rotation
Specications
Coverage
Horn rotation
Safety info

You can connect a cable from the SmartAmp or Zone speaker outputs to either of
the +ve (positive) and -ve (negative) pins, and use the other pair to link on to the
next loudspeaker. Note that when using these loudspeakers in low impedance
(not 100 or 70 volt line) you can only connect two loudspeakers per amplier
channel, as the impedance is reduced to 4 Ohms.
When multiple Cuboid 3TX and 5TX are in use, we recommend using 70 volt
taps when using bridged speaker outputs on a Zone, and 70 or 100 Volt as
required with SmartAmp. You can add as many speakers as the total load on the
amplier allows. For example, with the Cuboid 5TX on a 7.5W tap, you can use
up to 33 of them from a single SmartAmp 10.SmartAmp 10 has a maximum
output of 250W when all available power is directed to one channel (no power
will be available on the other channel) - 7.5W x 33 = 247.5W required.
It is perfectly possible to have different loudspeaker on different power tap
settings, to balance volume levels around a room – make sure that the total
power of the circuit does not exceed the capability of the amplier channel
driving that circuit.
For outdoor use, a weatherproof connector cover with cable glands can be
purchased as an accessory to ensure no water ingress to the loudspeaker
terminals.
Be sure to select a gauge of cable with a maximum outside diameter of 6.8mm to
ensure it ts inside the gland, and a minimum OD of 4 mm to ensure a good seal.
Insert the cables to be connected through the gland, then strip to a suitable
length, terminate and tighten the glands, ensuring they clamp onto the outer
insulation of the cable.
Then insert the four screws through the corners of the plate and into the
loudspeaker.
Connecting Cuboid 3, 3TX, 5 and 5TX
Cuboid 3, 3TX, 5 and 5TX loudspeakers are tted with four pin push-in euroblock connectors.
8/23
Cuboid
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USER GUIDE
© 2022. Optimal Audio Group Ltd. (v2.2)
>
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Introduction
Aiming/
coverage
Overview
Horizontal
coverage
Wall mount
Connecting up
Ceiling mount
Matching
speakers/amps
Grille removal
Accessories
Badge rotation
Specications
Coverage
Horn rotation
Safety info

Ceiling mounting Cuboid 8, 10, 12 and 15 using U bracket
The U brackets A, B, C and D are specically designed for hanging Cuboid from a ceiling in landscape
mode. Fixing the U bracket is a simple process:
• Remove the centre M8 bolt from the top and bottom of Cuboid
• Place the U bracket over the loudspeaker and line up the holes with the centre M8 bolt hole
• Use the supplied bolts to x the bracket to the loudspeaker
• When the angle is set, x with the supplied locking screw
9/23
Cuboid
Loudspeakers
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USER GUIDE
© 2022. Optimal Audio Group Ltd. (v2.2)
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Introduction
Aiming/
coverage
Overview
Horizontal
coverage
Wall mount
Connecting up
Ceiling mount
Matching
speakers/amps
Grille removal
Accessories
Badge rotation
Specications
Coverage
Horn rotation
Safety info

Grilles on Cuboid 8, 10, 12 and
15 loudspeakers are designed
to be easy to remove to facilitate
driver rotation. No screws are used
to hold them in place; they are
manufactured with a natural spring
which holds them in place in slots
in each side of the cabinets. The
grilles have two or three gaps in the
sides into which an appropriately
sized at‐bladed screwdriver can be
inserted to assist in removal.
Insert the screwdriver blade into
one of the gaps ‐ either at the top or
bottom of the cabinet.
Gently push the handle down. This
will ease the grille out of the slot,
it may have bitten into the paint
surface, so you just need to make
sure it is free to be lifted clear.
Now lift the handle up; this will ease
the grille forward slightly to prevent
the return on the grille dropping
straight back into the slot:
Grille removal
Repeat this process for the remaining gaps in the grille
to ease it out of the slot all the way up one side of the
cabinet; when you get to the nal gap the grille should pop
out and away from the front of the cabinet.
To replace the grille, rst insert one side into the slot on
one side of the cabinet. Make sure the return on the grille
is completely engaged in the slot. Push on the front of the
grille with the at of your hand, which will encourage the
other edge of the grille to locate on the side of the cabinet
close to the slot. Now push the edge of the grille back
starting at the top or the bottom to engage the return in
the slot; you may need to do this a little at a time, working
down the length of the grille until it pops into place.
1.
2. 3. 4.
10/23
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Introduction
Aiming/
coverage
Overview
Horizontal
coverage
Wall mount
Connecting up
Ceiling mount
Matching
speakers/amps
Grille removal
Accessories
Badge rotation
Specications
Coverage
Horn rotation
Safety info

When used in landscape rotate the Optimal Audio badge on the grille so that
it matches the orientation of the speaker. The badge is spring loaded and very
easy to rotate and can only be turned in xed 90° increments so you will have no
problem making sure that it is straight.
The badge is easier to rotate if the grille is rst removed (except Cuboid 3, 3TX,
5 and 5TX – grille is not removable). With the grille removed push the spigot
holding the badge in place so the badge is protruding forward from the grille and
is proud of the recess in which it sits. Rotate the badge as required and release
the spigot on the rear so it settles back into the recess in the grille.
To adjust the badge on Cuboid 3, 3TX, 5 and 5TX simply rotate as required.
Badge rotation
11/23
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Introduction
Aiming/
coverage
Overview
Horizontal
coverage
Wall mount
Connecting up
Ceiling mount
Matching
speakers/amps
Grille removal
Accessories
Badge rotation
Specications
Coverage
Horn rotation
Safety info

Cuboid model Horizontal coverage Vertical coverage
Cuboid 3 and 3TX 150˚ 100˚
Cuboid 5 and 5TX 130˚ 120˚
Cuboid 8 90˚ 50˚
Cuboid 10 90˚ 50˚
Cuboid 12 80˚ 50˚
Cuboid 15 80˚ 50˚
Cuboid coverage specifications
When installing loudspeakers, it’s worth taking a moment to understand how the
loudspeaker projects sound and how to get the best coverage in your venue by
careful aiming.
The coverage specs are useful for informing this important decision.
In any loudspeaker, the optimum output can be considered as the centre axis of
the high frequency driver - maximum SPL (Sound Pressure Level). The extremity
of the coverage is dened as the angle from the centre axis where the SPL drops
by 6dB to each side of the centre axis:
• 45° horizontally either side of centre for Cuboid 8, 10, 12 and 15
• 75° horizontally either side of centre for Cuboid 3 and 3TX
• 65° horizontally either side of centre for Cuboid 5 and 5TX
It therefore follows that the axis should be aimed at the furthest point of the
desired coverage area. This is also useful for controlling the amount of energy
hitting unwanted areas, such as a ceiling or wall, or ensuring SPL is not too high
for a listener near the loudspeaker (see page 14 on aiming and room coverage).
These specications refer to the loudspeaker ex-factory - with the loudspeaker in
portrait, the horn is tted to deliver coverage as shown in the table above.
If you intend to mount your Cuboid 8, 10, 12 or 15 in landscape mode (when
suspending horizontally from ceiling for instance), consider rotating the horn as
shown on the following page.
For Cuboid 3, 3TX, 5 and 5TX models the horn is not rotatable. The loudspeakers
can easily be mounted in either portrait or landscape as desired.
12/23
Cuboid
Loudspeakers
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Introduction
Aiming/
coverage
Overview
Horizontal
coverage
Wall mount
Connecting up
Ceiling mount
Matching
speakers/amps
Grille removal
Accessories
Badge rotation
Specications
Coverage
Horn rotation
Safety info

Rotating the horn (Cuboid 8 ,10 ,12 and 15)
Remove horn
Replace xings
Rotate horn
Rotate cabinet
2.
4.
1.
3.
13/23
Cuboid
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© 2022. Optimal Audio Group Ltd. (v2.2)
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Introduction
Aiming/
coverage
Overview
Horizontal
coverage
Wall mount
Connecting up
Ceiling mount
Matching
speakers/amps
Grille removal
Accessories
Badge rotation
Specications
Coverage
Horn rotation
Safety info

Loudspeaker aiming and room coverage
Sound Pressure Level decreases by 6dB for every doubling of distance from the
source loudspeaker. This means that 96dB at 5m from a loudspeaker will reduce
to 90dB at 10m – a signicant drop in energy.
Because of this level drop over distance, in larger rooms it’s worth considering
additional loudspeakers to counter this effect, maintaining volume and
intelligibility. In this case, it is important that the second row of loudspeakers
down the room are delayed to match the arrival of the sound from the rst pair of
speakers, as shown below.
25 deg
IDEAL AIMING FOR A 50 DEGREE VERTICAL HORN
HORN AXIS AIMED AT FURTHEST POINT OF COVERAGE
-6dB AIMED AT NEAREST
POINT OF COVERAGE
-6dB REDUCED ENERGY
ON CEILING
Loudspeaker axis aimed at the furthest point of
the desired coverage area
11.40 m
IN THIS EXAMPLE THE ROOM IS TOO BIG FOR ONE
SPEAKER TO BE ABLE TO COVER RIGHT TO THE BACK.
A SECOND SPEAKER IS ADDED AT THE POINT WHERE
THE FIRST AND SECOND CROSS OVER.
THE SECOND IS DELAYED BACK TO THE FIRST USING
THE FORMULA:
distance/speed of sound (334m/s @ 20 degrees C)
IN THIS CASE:
11.4/334 = 0.033 seconds, 33 milliseconds
14/23
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Introduction
Aiming/
coverage
Overview
Horizontal
coverage
Wall mount
Connecting up
Ceiling mount
Matching
speakers/amps
Grille removal
Accessories
Badge rotation
Specications
Coverage
Horn rotation
Safety info

Horizontal coverage
It is important to consider the dispersion angles, or coverage, of each
loudspeaker, and ensure that at the point at which you are at the extreme of the
loudspeaker’s horizontal coverage angle, you are overlapping with that from
another loudspeaker, to prevent “dead spots”, areas where the high frequency
sounds from the loudspeaker drop more than 3dB below those on axis of the
loudspeaker. This would reduce the speech intelligibility and the clarity of music
reproduction.
For Cuboid 8 and upwards, the
horizontal dispersion is narrower, and the
loudspeakers will necessarily be placed
closer together, or further away from the
listeners for seamless horizontal coverage.
Cuboid 3 horizontal coverage 2 x Cuboid 3 positioned to overlap horizontal coverage
Cuboid 3
Cuboid 3 Cuboid 3
15/23
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Introduction
Aiming/
coverage
Overview
Horizontal
coverage
Wall mount
Connecting up
Ceiling mount
Matching
speakers/amps
Grille removal
Accessories
Badge rotation
Specications
Coverage
Horn rotation
Safety info

Cuboid 8, 10, 12 and 15 are tted with two standard NL4 type connectors.
These have two pairs of terminals. Cuboid uses only pins 1+ and 1-. These are
linked across the two connectors, providing a useful link to a second loudspeaker
of the same model. No more than two Cuboids should be connected to a single
amplier channel. 2+ and 2- are not connected and are not linked through. For
connection, we recommend using a exible cable with a minimum cross-sectional
area of 1.5mm²
1+
2- 1-
2+
Connecting Cuboid 8, 10, 12 and 15
Cuboid connector viewed from rear
Cuboid uses these terminals
When wiring loudspeaker cables be careful
to observe the correct polarity of the cable
and connector at both ends.
16/23
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Introduction
Aiming/
coverage
Overview
Horizontal
coverage
Wall mount
Connecting up
Ceiling mount
Matching
speakers/amps
Grille removal
Accessories
Badge rotation
Specications
Coverage
Horn rotation
Safety info

To use the weatherproof connection cover, rstly run the input and link output
(where used) cables through the glands.
Trim the cable ends to t into the loudspeaker’s euroblock connector, without
leaving excessive exposed conductor, as this can easily short the two cores
together. Doing so will cause your amplier to protect itself, and no sound will
come from the loudspeaker.
Be sure to observe correct loudspeaker polarity.
Where present, make sure you have the correct tapping selected from the rotary
control beneath the input connector. Then push the cable mounted connector
into the speaker, and slide the cover over the cable until it ts against the recess
in the back of the speaker.
Insert the four screws to secure in place, tight enough to seal against the cabinet
but not over tight.
Finally, tighten the cable gland onto the cable(s) to provide a good seal. If only
one gland is used, tighten the second as far as you can.
Fitting weatherproof connector –Cuboid 3, 3TX, 5 and 5TX
17/23
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Introduction
Aiming/
coverage
Overview
Horizontal
coverage
Wall mount
Connecting up
Ceiling mount
Matching
speakers/amps
Grille removal
Accessories
Badge rotation
Specications
Coverage
Horn rotation
Safety info

Transformer taps – Cuboid 3TX and 5TX
Cuboid model 70V taps 100V taps
Cuboid 3TX 2.5 3.75 5 7.5 5 7.5 10 15
Cuboid 5TX 2.5 3.75 5 7.5 5 7.5 10 15
18/23
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Introduction
Aiming/
coverage
Overview
Horizontal
coverage
Wall mount
Connecting up
Ceiling mount
Matching
speakers/amps
Grille removal
Accessories
Badge rotation
Specications
Coverage
Horn rotation
Safety info

To get the best from your loudspeakers, it’s important to make sure the amplier
you are using is up to the job. Several factors have to be considered, and it’s
worth clarifying what they mean and how they affect the performance of a
loudspeaker.
Loudspeakers tend to be quantied using Watts, but this is purely a measure
of the amount of power a loudspeaker can take at its input over time, and not
necessarily a measurement of how loud it might go.
Optimal Audio loudspeaker power handling is therefore quoted as Watts (AES)
and Watts (Peak), Peak delivering 6dB(SPL) acoustic output higher than AES
(AES2-2012 standard) and referring to the loudest transients a loudspeaker can
handle without distortion.
In Watts, this means that the peak power handling of a Cuboid 3 for example
is 120W, four times its continuous power handling of 30W.The peak power
handling for a Cuboid 8 is 800W, four times its 200W continuous power
handling capability.
So, give a Cuboid 3 30W of continuous power and you will get 98dB(SPL) out of
it if you are standing 1m away from it. It will however be able to deliver transient
peaks in the audio signal at 114dB(SPL(@1m)) when connected to an amplier
capable of delivering the full 120W of its peak power handling.
Deliver 200W of continuous power to Cuboid 8 and you will get 115dB(SPL)
out of it if you are standing 1m away from it. It will however be able to deliver
transient peaks in the audio signal at 121dB(SPL(@1m)) when connected to an
amplier capable of delivering the full 800W of its peak power handling.
In the case of Cuboid 3TX and 5TX, the inclusion of a 70V/100V transformer
determines the amount of power being delivered to the loudspeaker – see
previous page. The amplier ‘sees’ the transformer and not the actual
loudspeaker, enabling many loudspeakers to be connected together up to a value
that does not exceed the amplier’s power output capability in Watts.
What this all means is that for the best performance from your loudspeaker,
make sure you have an amplier that is capable of delivering more than a
loudspeaker’s rated AES power handling ability at the nominal impedance of
the loudspeaker – 8 Ohms in the case of all low impedance Cuboid speakers.
A 200W amplier will deliver 115dB(SPL) from a Cuboid 8 and nothing more,
but a more powerful amplier will have the headroom to deliver short musical
transients at higher levels, thereby ensuring that faithful reproduction of the
program material is maintained.
Product specications for each model are on page 21 of this guide.
Matching speakers and amplifiers
19/23
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Introduction
Aiming/
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coverage
Wall mount
Connecting up
Ceiling mount
Matching
speakers/amps
Grille removal
Accessories
Badge rotation
Specications
Coverage
Horn rotation
Safety info

Weatherproof Cover (black) CIPKIT-B Weatherproof cover for Cuboid 3, 3TX, 5 and 5TX (black)
Weatherproof Cover (white) CIPKIT-W Weatherproof cover for Cuboid 3, 3TX, 5 and 5TX (white)
Wall Bracket A (black) WB1-B Wall bracket for Cuboid 8 (black)
Wall Bracket B (black) WB2-B Wall bracket for Cuboid 10 & 12 (black)
Wall Bracket C (black) WB3-B Wall bracket for Cuboid 15 (black)
U Bracket A (black) UB1-B U bracket for Cuboid 8 (black)
U Bracket B (black) UB2-B U bracket for Cuboid 10 (black)
U Bracket C (black) UB3-B U bracket for Cuboid 12 (black)
U Bracket D (black) UB4-B U bracket for Cuboid 15 (black)
Accessories
20/23
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Introduction
Aiming/
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Overview
Horizontal
coverage
Wall mount
Connecting up
Ceiling mount
Matching
speakers/amps
Grille removal
Accessories
Badge rotation
Specications
Coverage
Horn rotation
Safety info