Target curve, timbre target, LF target

Following fields are needed for the calculation of your optimised target curve :

  • Field “Target curve” : “Auto music” is recommended for home HiFi and pro music studios. For calibration of theaters or mixing rooms, SMPTE targets maybe be used with a choice depending on room size. Other possibilities are AES and B&K bin some cases. The new “Dolby Atmos Music” target has been added to comply to Dolby Home Entertainment specifications.
  • “Timbre target” (only valid if “Auto music” is choosen) : the standard “Balanced” can be adjusted on user preferences to Bright (sharp, more high frequencies) or Warm (darker, more low frequencies). Difference to “Balanced” is a slope of approximatively +-0.3dB/oct (exact value depends on measurements,  distances and directivity) so nearly +2dB at 10kHz for “Sharp” and -2dB at 10kHz for “Warm”.
  • “LF target” (only valid if “Auto music” is choosen) : low frequency target is defined by cutoff frequency and level for L+R : hereunder  “409” gives a +9dB level and a 40Hz cut. Level at 40Hz cuttof freq is +9-3=+6dB. Level at 130Hz is half max level so +9/2=+4.5dB. As LF target for Auto Music is optimised for both speakers together (L+R), so to get a flat response for each separated channels, choose a value ending with 3 (ie 403 or 603), because L+R in low frequencies gives nearly +3 or 4 dB compared to response of L or R separated. With lower taps number (2048 or less), you may not get the expected response (see simulations in p7), in this case, try to adjust LF target value by lowering cuttof frequency and do another calculation.

After the target curve is calculated, it is available in ‘My measurements’ as ‘target.drc’ so you may use this target for other purposes, ie with Sbragion’s DRC-FIR software.

Read more on this topic here.