DSPeaker Anti-Mode 8033 cinema User manual

ANTI-MODE 8033 User's Manual
Revision History
Rev. Date Author Affected
chapters
Description
1.0 30.11.2007 TK & ToLi All Original version Finnish and English
1.1 13.12.2007 TK 5 Updated input sensitivity level
1.2 7.1.2008 TK 6 www.dspeaker.com
1.3 18.1.2008 ToLi 2 Input level warning leds / converter delay
1.4 19.3.2008 ToLi All Typo fixes, chapter 2.1 reflex advice added,
chapter 7 added
1.5 3.4.2008 TK All Reformatted, added power consumption to Ch 8.
1.6 8.1.2010 POj All C-version graphics, some parts rewritten

ANTI-MODE 8033
Rev. 1.6 08.01.2010 Page 2 (12)

ANTI-MODE 8033
Table of contents
1. Connections and buttons.................................................................................................3
1.1. Front panel:..................................................................................................................3
1.2. Back Panel:..................................................................................................................4
2. Quick setup guide.............................................................................................................5
2.1. Before calibration.........................................................................................................5
2.2. Calibration...................................................................................................................6
2.3. After calibration............................................................................................................6
3. Wider area correction.......................................................................................................7
3.1. Strategy 1, “Compensation of the weakest point”:........................................................7
3.2. Strategy 2, “Gradient compensation”:..........................................................................7
4. Basic operation.................................................................................................................8
4.1. Bypass mode...............................................................................................................8
4.2. Lifting EQ.....................................................................................................................8
4.2.1. “Flat”..................................................................................................................8
4.2.2. Lifting 15-25Hz..................................................................................................8
4.2.3. Lifting 25-35Hz..................................................................................................8
4.3. Bridging.......................................................................................................................9
4.4. ADC level warning.......................................................................................................9
5. Technical specification...................................................................................................10
6. Manufacturer...................................................................................................................10
7. Support.............................................................................................................................11
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ANTI-MODE 8033
ANTI-MODE 8033 User's Manual
1. Connections and buttons
1.1. Front panel:
1. Microphone input jack
2. Button A: LIFT 25 / LIFT 35 / FLAT selector
Short press: Selects low frequency boost
Long press: Store current low frequency boost setting
3. Button B: BYPASS
Short Presss: Disable/enable processing
Long press: Begin second-phase calibration for wide area correction
Buttons A & B simultaneously long press: Begin calibration
4. PWR LED: Lit when the device is on
5. BYPASS LED: Lit when bypassed
6. LIFT 25 LED: Lit when 15-25Hz lifting EQ and subsonic filter is on
7. LIFT 35 LED: Lit when 25-35Hz lifting EQ and subsonic filter is on
8. POWER switch: Switches power on/off
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Figure 1: ANTI-MODE 8033 Front panel

ANTI-MODE 8033
1.2. Back Panel:
1. 9V AC-connector: Input power. Note that the unit needs AC voltage!
2. OUT 0-connector: In-phase RCA out (default)
3. OUT 180-connector: Out-of-phase RCA out
OUT0 and OUT180 connectors can be used for bridged operation of stereo
amplifier
4. LINE IN-connector: Line input (subwoofer pre-out signal from pre-amplifier or A/V
receiver)
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Figure 2: ANTI-MODE 8033 rear panel

ANTI-MODE 8033
2. Quick setup guide
1. Connect the subwoofer signal pre-out to "LINE IN".
2. Connect the active subwoofer to "OUT 0" output.
3. Connect microphone plug to "MIC" jack and fix the microphone as close to the
listening position (head of the listener) as possible.
4. Connect the power supply to "9V AC" connector and wall socket.
5. Switch ANTI-MODE 8033 on.
Note: All the leds on front panel are lit if the device has never been calibrated
6. Switch on the subwoofer and leave its volume setting unaltered
2.1. Before calibration
With small reflex subwoofers, it is adviced to decrease their volume before calibration. If the
subwoofer has a built-in low-pass or other type of filter, it should be deactivated during
calibration process. It can be re-activated after calibration. Cross-over and low-pass filters at
the A/V receiver do not affect calibration, since they take place before Anti-Mode 8033 in the
signal chain. Also any other audio equipment that may affect subwoofer signal prior to the
Anti-Mode 8033 do not interfere with the calibration process. As room modes may have
strong dependency of the position, it is advisable to also pay attention to the vertical
positioning (height) of the calibration microphone. The microphone is omnidirectional, so its
precise orientation doesn't matter. If you want the room correction to affect a wider area, the
first calibration point should be selected near the center of this area (or the primary listening
position). More about wider area correction in the latter section “Wider area correction”.
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Figure 3: Setting up ANTI-MODE 8033

ANTI-MODE 8033
2.2. Calibration
Press both buttons at the front panel and hold them for about three seconds. Make sure that
both of the buttons are pressed and held. After about three seconds the middle LED will
start flashing and calibration begins. You may now release the buttons and wait for the
automatic calibration to finish. The measurement program analyzes the room four times with
a frequency sweep.
During the calibration, the device will adjust the output level automatically. If the microphone
level in is too loud, it is automatically decreased. The calibration is quite robust, so it
tolerates certain amount of background noise, hence speech and small noises do not
distract the process. However, one should avoid making loud noises, especially near the
microphone.
2.3. After calibration
Once the last sweep is over, the calibration is finished. The results are stored in to the non-
volatile memory inside the unit. The Anti-Mode 8033 is now fully functional and the
microphone can be detached, unless the user wishes to perform wider area calibration.
After calibration the subwoofer may sound more quiet than before. This is because the room
resonances have been suppressed. Typically, the subwoofer volume needs to be increased
slightly (3-10 dB).
If the A/V receiver supports speaker distances, you can add 90 cm to the subwoofer
distance relative to other speakers to compensate for the internal processing delay. This is
not absolutely necessary since the delay is small enough that the human auditory system
can generally not detect it. You can also use your A/V receiver's automatic functions to
determine the correct distance and level settings.
Attention! If for some reson only one sweep signal was generated during the calibration, both
buttons at the front panel were not pressed. In this case, the calibration process must be
reinitialized.
Whenever the placement of the subwoofer or listening position changes, the calibration
should be performed again to assure optimal result.
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ANTI-MODE 8033
3. Wider area correction
In some situations it is more favourable to compensate the room acoustics for a larger area.
In this case, the result is no longer optimal in any single listening position, but generally
improved for a wider area. Before wider area correction, the normal calibration procedure
described in the earlier section must be performed. The initial calibration is done with the
microphone at the center of the listening area (or primary listening position within the area).
Anti-Mode 8033 is calibrated to larger area by taking the microphone to some other point
within the listening area. Pressing and holding button B, bypass (Figure 1, object 3) will
initiate a single additional frequency sweep. Anti-Mode 8033 will use it in conjunction with the
data gathered at the first calibration to create a compensation model for a larger listening
area within the room.
Do not accidentally press and keep both buttons at the front panel, as this will start main
calibration all over again and overrides the current room data.
Wider area calibration can be done multiple times and it does not lose the data from the
main calibration. Thus it is easy to try different second phase calibration points for the best
audible result. There are several strategies in choosing the microphone position for second
phase calibration.
3.1. Strategy 1, “Compensation of the weakest point”:
When the first (main) calibration is performed to the primary listening position or to the
center of the listening area, one can already evaluate the result by listening it at different
positions. If the result is not adequate at some location, this spot could be used as a second
phase calibration point. Also any location between this point and the first point can lead to
good results. Inevitably, the result will get less optimal in the first point, but usually improved
a lot everywhere else including the weakest point.
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ANTI-MODE 8033
3.2. Strategy 2, “Gradient compensation”:
When the first (main) calibration is performed to the primary listening position or to the
center of the listening area, but it is difficult to find the weakest point within the listening area,
gradient compensation is a good approach. Second phase calibration point for wider area
correction can be found by taking the microphone from first calibration point toward the
closest corner of the listening room by 40-90 cm and down (toward the floor) approximately
10-20 cm. Wider area calibration second phase will be performed to this achieved position. If
the first (main) calibration point was in close proximity of walls (distance less than 1m.) , the
microphone should be moved only about 20-40 cm toward that wall for second phase
calibration. Gradient compensation method usually works well in removing the axial modes
for larger area in rectangular room.
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ANTI-MODE 8033
4. Basic operation
4.1. Bypass mode
If you want to compare the corrected and uncorrected operation, press the Bypass button
shortly. This will switch between bypass and normal mode. The first press will put Anti-Mode
into bypass mode, which is also indicated by the “Bypass” LED (Figure 1, object 5) on. If the
Bypass mode is already active, the unit switches to normal mode instead. In bypass mode,
no room corrections are active. Also the user selected lifting EQ is turned off.
4.2. Lifting EQ
The Lifting EQ button rotates between three equalization modes of Anti-Mode 8033 and
stores the setting if held longer. A brief sound is heard from subwoofer when the setting is
stored.
4.2.1. “Flat”
The first lifting EQ setting is no lifting, “flat.” Neither of the LEDs 'LIFT 25' nor 'LIFT 35' is lit.
In this setting, the target response is flat from 5 to 148 Hz.
4.2.2. Lifting 15-25Hz
In lifting 15-25 mode, when the LED “LIFT 25” is lit, the Anti-Mode will boost frequencies
between 15 and 25 Hz (max. 7dB at 20Hz). This will also activate digital infasonic filter,
which will filter out frequencies below 10Hz, that can be dangerous to ported subs without
proper protection.
4.2.3. Lifting 25-35Hz
Third mode, lifting 25-35 similarly boosts range 25-35 Hz (max. 7dB at 30Hz) on subwoofer.
This mode is active when the LED LIFT 35 is on. This will also activate digital infasonic filter,
which will filter out frequencies below 10Hz.
It is easiest to find out which of the lifting settings gives best result by simply listening. Lifting
below 35Hz could be useful for reflex subwoofers, which have port tuning above 30Hz, but
the lowest frequencies are attenuated to the listening position. With music, 'flat' is probably
the best option, as it gives the most accurate transient response. Lifting below 25Hz could
be applicable for a large subwoofer, which has -6dB point too high because of suboptimal
positioning.
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ANTI-MODE 8033
4.3. Bridging
Bridging is always done with user's own responsibility and consideration, as not all stereo
amplifiers can provide bridged operation. Ordinary stereo amplifier can be bridged by using
both OUT-0 and OUT-180 RCA outputs. (Figure 2, objects 2 and 3.). Using differential
output will give 2.83 times the amplification of a single output channel. In bridging + poles of
both the output channels of the power amplifier are used instead of + and -. Bridging is
useful as means of multiplying the power of stereo amplifier used for passive subwoofer.
4.4. ADC level warning
If the input signal level in AD-converter is close to the input sensitivity maximum value, the
user is warned about this in two phases. If the input signal level has only 3 dB of headroom,
the “Bypass” led will start flickering. If the input level reaches maximum, the “lift 25” led will
start flashing (independent of whether these leds were lit in the first place or not). If the input
signal is higher than maximum value of ADC, the signal is saturated to avoid clipping.
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ANTI-MODE 8033
5. Technical specification
Electrical characteristics:
Operation voltage: 9V AC
Power consumption 1.2 W (from 9V AC)
Input sensitivity: line level (max 1.75 Vrms)
Frequency range: 5 – 160 Hz (-6 dB)
Low-pass: Bessel 12 dB/oct, fc = 160Hz, Q=0.5
Amplification: 1.5 x
Dynamic ratio (unweighted): 90 dB
Firmware features:
Anti-Mode-Filters: 24 pcs.
Correction range: 16 - 144 Hz
Frequency resolution: < 0.5 Hz
Maximum attenuation: 96 dB
Filter Q-value range: Unlimited (32-bit integer space)
Sub-sonic-filter: 10 Hz (user selectable)
Computation accuracy: 32/40-bit integer
6. Manufacturer
VLSI Solution Oy / DSPeaker Division
Hermiankatu 8 B
FIN-33720 Tampere
FINLAND
Fax: [phone]
Tel: [phone]
Email: [email protected]
URL: http://www.dspeaker.com/
7. Support
[e-mail]
[e-mail]
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