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User reviews on Active Filter products

Great analog gear (Klark Teknik - DN 800)

By Bernard Ancèze, 05/12/2014
The Klark Teknik DN800 is an analog active filter conceived for sound reinforcement, recording studios and fixed installations.
It may be configured as a four-input, two-way systems or as a two-input, three or four-way system.

Klark-Tekink includes interchangeable cards to adjust the frequencies and slope to the speakers. If Klark-Tekink doesn't have the card corresponding to your speakers, a technician can install the adequate capacitors and resistors for the filters recommended by the speaker manufacturer. The manual of the DN800 lists the capacitors and resistors per frequencies.

It has no buttons to choose the frequencies nor slopes, on the other hand, it's extremely precise, it doesn't move and it's as silent as a tomb. The input and output levels, as well as the mutes, are accessible on the front panel. The phases and limiters are on the rear.

It's not as versatile and comprehensive as the DN8000, but it's 10 times cheaper (secondhand, because it's not manufactured anymore).

Four-channel, Two-way
LEDs Indicate: 2 WAY
Input 1 : Output 1 Low / Output 2 High.
Input 2 : Output 3 Low / Output 4 High
Input 3 : Output 5 Low / Output 6 High.
Input 4 : Output 7 Low / Output 8 High.

Two-channel, Three-way
LEDs Indicate: 3 WAY
Input 1 : Output 1 Low / Output 2 Mid / Output 3 High / Output 4 Direct
Input 2 : Output 5 Low / Output 6 Mid /Output 7 High / Output 8 Direct

Two-channel, Four-way
LEDs Indicate: 4 WAY
Input 1 : Output 1 Low / Output 2 Low Mid / Output 3 High Mid / Output 4 High.
Input 2 : Output 5 Low / Output 6 Low Mid / Output 6 High Mid / Output 8 High

Does the job (dbx - 223 XS)

By noswitch, 09/10/2014
Used since February 2013 to refine my system: 2 x QSC K12 + 1 x sub FBT PROMAXX 15SA.
I have not tried other models before.
+: Great variety of crossover points (with x10 button), ease of use (no need to bone up a lot the manual), it can do it on any system in 2: 1 or 2: 2.
-: Nothing to complain about. One can nevertheless speak phase problems at the crossover frequencies close to those of sub or heads. But this problem exists for any filter. He of course also less chance that a real processor.

Does the job (dbx - 223 XS)

By noswitch, 09/10/2014
Used since spring 2013.
I have not tried other models before.
+: It works for any system 2: 1 or 2: 2
-: Not much to complain but beware of phase problems on your subs and heads cut off frequency (which is valid for any filter).

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