The interactive crossover design tool (ICD) substantially reduces the time and effort it takes to design a crossover by allowing
 you to first simulate a design without actually having to build it. ICD virtual crossovers are defined using ASCII text circuit
 files that are then converted to left and right test signals that simulate the effect of the crossover.The ICD works in either
 Impulse or MLS test mode.

 The circuit file format is based on the Berkley SPICE format and is entered as a series of devices connected to nodes where each
 node would be the soldered-together connections in a physical crossover.With care, the resulting crossover will often be close
 enough that little or no additional tweaking is needed.

   Improper use of the Interactive Crossover Design tool (ICD) can result in damage to drivers or amplifiers.
   Make sure to protect your drivers with a driver protection circuit. Click here to see an example of how to build a driver
   protection circuit.


 The following example shows an input signal connected between node 1 and ground (node 0). A capacitor C1 then connects the
 input signal to the tweeter that is connected between nodes 2 and 0. Likewise, inductor L1 passes signal to the woofer between
 nodes 3 and 0.

 The tweeter and woofer loads are not simple resistors. Highly acurate simulations are possible when these loads are defined using
 ZMA complex impedance files produced with the WT2 or WT-Pro high power impedance measurement ports. If you do not have a
 ZMA file, the XO_xxxx statement will also accept a resistive load or an FFT defined response.

 One additional element to this design is the driver protection circuit defined in XO_RIGHT. When this
 simple resistor and diode clamp circuit is used, its effects are taken into account when the simulated test signal is generated.
 The result is a reasonably well protected driver should an amplifier or human error occur.


* 1st order high/low pass crossover


*        (1)              C1 4uF       (2)

*        +----------------||-----------+    protection

*        |                             |    circuit

*        |      L1 2mH                 |    +--+

*        +------/\/\-----+ (3)         +----|  |

*        |               |                  |  | Z=tweeter.zma

*  Vsig  +               Z=woofer.zma  +----|  |

*        -               |             |    +--+

*        |               |             |

*       ///             ///           ///



Vsig     1 0 AC   1             * Input signal 

C1       1 2 4uF                * High pass capacitor

L1       1 3 2mH                * Low pass inductor

XO_RIGHT 2 0 "tweeter.zma" 5.0  * Five_ohm+diode clamp protection

XO_LEFT  3 0 "woofer.zma"       * No protection (direct connect)


 ICD Settings
  • Activate the WT Control Window
  • Select Impulse or MLS Aquisition mode
  • Choose Line or Microphone as measurement option
  • Set 'Ref' as the referece

 ICD Devices that can be simulated

  • Since the ICD algorithm modifies the output test signals to the amplifier and drivers, an internal reference must be used in
    the response calculation.

  • Though an effective distance can be calculated on a frame by frame basis, allowing phase calculations, its absolute value is
    lost. This is because operating system delays through the DAC and ADC paths vary. This can cause data 'burps' if time
    averaging (smoothing) is enabled and the Windows multimedia driver changes its ADC to DAC internal timing.  If this happens
    and is bothersome, either turn off smoothing or find the offending Windows applications and shut it down.

  • The resulting response and phase angles depend on a number of factors including the driver terminal polarity, distances and
    microphone position. Since the ICD output is real-time, these parameters can also be adjusted in real-time. Additionally,
    phase wrapping and offset can be modified in the Setup Control window.

  • Driver-to-driver sensitivity can be adjusted with the amplifier's balance control

  • The bare driver-to-driver phase transition (minus the crossover) can be measured by specifying complimentary filters with
    extremely high attenuation slopes in two RESPONSE.FRD files (each with zero phase).

  • Up to N nodes with up to M inductors, capacitors or resistors are supported.

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