||DD0254 is a grid for close-miking applications, which gives a soft reproduction of the high frequencies.
The response is linear up to 15 kHz after which it has a soft roll-off - a bit earlier than the standard mounted DD0251 near-field grid. This close-miking grid offers optimum clarity and balance in close mic situations with a neutral frequency response from 10 Hz to 15 kHz (+/-2 dB). Furthermore, mount this grid in other recording situations, if you generally want a smoother treble reproduction.
You can tell the difference between the DD0254 close-miking grid and the standard mounted near-field grid by its sharpened shape.