MAGICO S-Sub Guide de l'utilisateur
Magico Subwoofer Setup
and DSP Control Manual
!
!
!
Thank you for the purchase of your new Magico S-Sub or Q-Sub.
The goal of this setup manual is to first integrate the
subwoofer into your stereo system and also to describe the
various aspects of crossover and equalization optimization
using our highly adjustable Digital Signal Processing
software. (For those with home theater applications please
consult the setup literature for your home theater processor
to setup the subwoofer using the available functions of the
processor: auto calibration, room correction etc.)
!
!
!of !1 21
DSP Password: Fact_ory
To optimize the subwoofer’s performance you will need some basic
measurement equipment and software. listed below are relatively
easy and inexpensive options:
!
Software:
REW - http://www.roomeqwizard.com/ - Free
or
Omni Mic - http://www.daytonaudio.com/index.php/omnimic-v2-precision-
measurement-system.html!
Includes Microphone and uses CD as signal source, minimal physical
connection required.
!
Measurement Microphone: !
UMIK-1 - http://www.minidsp.com/products/acoustic-measurement/
umik-1
or
UMM-6 - http://www.daytonaudio.com/index.php/test-measurement/
umm-6-usb-measurement-microphone.html!
!
for this guide we will use REW measurement software, but any modern
software should work fine. Since we are measuring bass frequencies
there is no need for high end microphones or hardware to enable the
measurement of high frequencies or distortion.
!
General information
The Magico QSub is designed to add Ultra low frequencies and
improve overall bass behavior in a high end stereo system. The
common cutoff frequency will be 50 Hz and optimal integration will
be achieved when used with Magico S or Q Series loudspeakers, which
employ a sealed box design.!
!
We will rely solely on measurements of the bass frequency response.
(Our ears are not sensitive enough to determine the source or the
magnitude of problems in the bass region, yet they easily notice if
there are problems in that region). place the measurement microphone
in the listening position. (for a wider listening area one must take
multiple measurements from a variety of locations and average the
response, this is beyond the scope of this guide)
!of !2 21
Safety
Before plugging the processor in, always make sure that the power
supply matches the product specification voltage (110-220V). Do not
supply power before all components of the system are set up and
connected properly. After connecting all cables, you should mute
all outputs first or turn the gain/level settings to minimum.
!
8 Steps
1. Position your main speakers
2. Unpack your QSub
3. Install the Magico DSP Control Software from the CD
accompanying your QSub
4. Hook up your QSub
5. Position your QSub
6. Remove the casters and apply feet to the QSub
7. Determine Level of the QSub
8. Determine Crossover of the QSub
9. Determine EQ in the QSub
!
1.Position your Main speakers to achieve the flattest frequency
response possible. Adjust distance from the rear and side walls by
increments of 6” at a time to remove as many frequency response dips
as possible. Once you are satisfied with the position of the main
speakers you are ready to bring the QSub into the room and position
it.
2. Unpacking your QSub
Using a flat-head screwdriver remove the four clamps from the door.
With a 9/16” Socket bit attached to a cordless drill remove the
bolts from around the bottom of the crate. Remove the door. With
one person on each side, lift up the walls of the crate and walk it
back way from the speaker. on the top of the crate door are two
small holes, lie the door down so that the two dowels on the open
end of the crate base fit into the holes and the hinged support on
the bottom of the door is folded down to support the door/ramp.
loosen the straps holding the speaker in place and carefully lift "
!of !3 21
them over the ends of the speaker and remove the two wooden
constants from the top of the subwoofer. Disengage the caster
brakes. With one person on either side carefully and slowly roll the
subwoofer off of the crates based, down the ramp and onto the
floor.
3. Install the Magico DSP Control Software from the supplied CD to
your PC or Apple computer
4. Hook up your QSub
You will need a 20amp C19 IEC power connector. Connect the
output(s) from the Preamp to the Ch. 1 XLR input connector (mono)
or both, Ch.1 and Ch. 2 XLR input connectors (stereo). Connect a
USB cable from your computer to the subwoofer. Make sure that the
subwoofer’s power switch is in the down (off) position. Plus in the
power cord, make sure that your source is on with a minimal volume
setting and your can switch your QSub ON. (You can a find a more in
depth description of all of the connections on the rear panel as
well as the capabilities when configured via ethernet connection to a
network later on in this manual)
!
5. Position your QSub(s)
We will start by measuring the QSub bass frequency response.!
We will try to optimize the QSub location so we will have smooth
frequency response up to 100Hz while trying to minimize the dips in
the frequency response. Follow the instructions of your
measurement software to take SPL measurements of the subwoofer
alone from a microphone placed at ear height in the listening
position.
Start by placing your QSub between your main speakers. if this is not
possible, try to place it near one of the corners behind your main
speakers. Measure it at the first location. Begin by making
incremental movements (6 inches at the time) both in relation to the
side and back wall until you get the smoothest response from the
subwoofer in a reasonable position in the listening environment.
Try to compare your measurements using overlays:
You can overlay them all under the “All SPL” tab. Now deselect
them all. You can do this by right clicking over the legend area. You
can choose which to overlay, making it easier to analyze the results.
!
!of !4 21
!
Here you can see for a single subwoofer the Left position rear
corner positioning is the best. It is much smoother from 50 – 100 Hz.
Here is the same Measurement with the window expanded to
50-200Hz.
!of !5 21
The aspect that many find difficult is knowing what to do with the
results. One of the main things we are looking for here is to combine
acoustic sources in different locations that, when summed, remove
frequency response dips. Combine two speakers with the same dip and
you are stuck with it. Combine two speakers each with a dip in a
different place and the other counteracts it. Where all sources are
in-phase, they will sum as shown.
!
!
SPL response Summed for two speaker with major dips
You can see that where both speakers have the same level and are
both flat, they gain a 6 dB increase in level combined. When one of
them has a dip, the speaker with the dip simply fails to contribute as
much, and the result is that the dip tends to be smoothed. In some
cases the dip has very little effect. You can use this to your
advantage by selecting positions that cancel out the dips.The
measured response of speakers in a room is quite complex, so
predicting the combined response is not quite as simple as one might
expect.
The main priority is to avoid dips. The peaks at this stage are less of
a concern as they can often be tamed with EQ later in the process. If
!of !6 21
dips remain after treatment and the placement of multiple bass
sources, then they will most likely remain unfixable.
Here we show the results (20-291Hz) when the main speakers are
added and frequency response is further smoothed from overlapping
of the main speakers and the Sub. The left red corner positioning
(yellow) is still the best. This position is both smoother overall and
the dip the once existed at 100 Hz for the subwoofer alone has been
eliminated by the main speakers.
You are finished positioning your Subwoofer.
6. remove the casters and apply the feet.
apply the brakes on both casters which have them. While two people
lift up the side of the speaker without the brakes, a third person
unscrew the casters and replace them one at time with the feet.
carefully lower the subwoofer to the ground and repeat the process
by tilting the subwoofer in the opposite direction and screwing in the
remaining two feet. Be very careful to have ample help the hold the
speaker safely while this process is performed.
7. Determine the level of the QSub
Before applying any EQ or crossover, make a final measurement of
the QSub and both main speaker. Make sure the measurement is done
in minimum 85 dB level so it will represent normal listening level.
!of !7 21
Compare the two (Using Overlay if using REW); adjust the level of
the QSub with the QSUB Gain Control (the right level control on the
screen shot below)
!
The level of the sub should be between the mains levels up to 6 dB
more. See the graph below. !
This is subject to the room structure and low frequencies behavior,
generally speaking, wood houses in North America will work better
with the higher level and stone houses in European style will work
better with the lower level.
!
!
!
!of !8 21
8. Determine Crossover of the QSub
!
In this section we will determine the low pass frequency and slope
and the phase of the subwoofer. Our approach is to use the QSub to
help smooth the overall in room bass response and extend the low
frequencies.in order to achieve this goal it is recommended to allow
overlapping. You should use the frequency, phase and slope setting
of the sub to achieve the smoothest overall bass response. This way
the mains and a single QSub load the room from three positions. In
the example in Figure 6 below, the best location for the sub (red line)
has a dip at 70 Hz. The mains (black line) don’t have the same dip so
they are allowed to run down to about 60 Hz to eliminate the dip.
With this arrangement all dips below 100 Hz are eliminated. Below
100 Hz, EQ is required only to shape the response to match the
target curve. A conventional crossover would fail to eliminate the
dips regardless of the number of subwoofers. No possible subwoofer
locations were able to remove the dip.
!
!of !9 21
9. Determine EQ for the QSub
This is the final step in which we will try to achieve two targets:
1. Using eq filters to remove as much as possible persist peaks
that comes from room modes.
2. Use eq filters to shape the response into a desirable in room
response.
!
!
!
Step 1
Since REW has a very useful EQ tool to calculate filter settings we
will use it to demo how to achieve our target.
1. Click on the Overlays icon in REW: !
!
2. Set graph limits with sensible settings, limiting the x range to
10 - 100 Hz and excluding empty data.
3. Click on the EQ icon in REW:!
!
!of !10 21
Ce manuel convient aux modèles suivants
1
Table des matières
