Crossovers / filters (general)
DLS A-series amplifiers include highpass filter (HP) and lowpass filters (LP).
The HP-filterscan be used in one of two ways. Either as a subsonic filter together with a subwoofer to remove the lowest frequencies which often causes a rumbling bass reproduction. A nor- mal setting is 20 - 30 Hz.
The HP-filter can also be used together with a front or rear stereo system to remove frequencies below the crossover setting. In a system with a separate subwoofer it´s normal to limit the bass reproduction to the front system. A normal setting is between 80 - 100 Hz, but feel free to try other settings.
If you have problems with the mid bass driver ”reaching the bottom” (the voice coil reches the bot- tom pole plate) at high volumes, use the HP-filter to avoid this with a setting at 50 - 80 Hz.
A subsonic filter is actually a HP-filter.
The LP-filtersare normally used when you connect a subwoofer in bridge mode. The filter can be switched in and out. A normal setting is 70 - 80 Hz. The filter slope is 12 dB.
Active crossover.
A4 and A7 the LP and HP-filters have a frequency range making it possible to use them for active crossover to a 2-way speakersystem.
Crossovers on each model
DLS A1
DLS A1 has an internal adjustable HP-filter that can be switched in/out. It can be set from 20 up to 200 Hz. It also has an internal fixed LP-filter that can be set to either 70 or 90 Hz. The filter switch is available through a hole in the bottom plate.
DLS A2 och A3
DLS A2 andA3 has an adjustable LP-filter that can be switched in/out. It can be set from 50 - 125 Hz. There is also an adjustable HP-filter that can be switched in/out.The filter is adjustable from 20 - 200 Hz.
PHASE SHIFT BUTTON ON A3:
DLS A3 has a button marked ”PHASE”. Use this button to phase reverse the speaker output. The button is only working when the lowpass filter is in use. Only use this button when you want to phase reverse a subwoofer to get the best sound.
DLS A4
DLS A4 is equipped with adjustable HP-and LP- filt- ers on all channels. These can also be switched in/ out. The filters are equipped with a multiplication button for improved flexibility.
The filter setup are as follows:
Front:
Lowpass (LP) 50 - 125 Hz
Highpass (HP) 20 - 200 Hz alt 60 - 600 Hz (x 3 button)
Rear:
Lowpass (LP) 45 - 200 Hz alt. 90 - 400 Hz (x 2 button) Highpass (HP) 20 - 200 Hz
The x2 and x3 buttons are used if you run a 2-way system with active crossover between mid-bass and tweeter.
DLS A5
Front channels:
DLS A5 has an internal adjustable HP-filter that can be switched in/out. It can be set from 50 up to 150 Hz.
Sub / mono channel:
The mono channel filters are for use only with one or more subwoofers There is a LP-filter adjustable from 40 up to 90 Hz, and a subsonic filter at 25 Hz that can be switched in-out.
DLS A6
DLSA6 is a mono amplifier for use only as a subwoofer amplifier.
It has a fixed 25 Hz subsonic filter that can be switched in/out.
It also has a LP-filter adjustable from 50 - 125 Hz. This filter can not be disconnected.
DLS A7
This is a five channel amplifier with a lot of filter possibilities described in detail on page 8.
DLS A8
DLS A8 amplifiers include HP-filter and LP-filters on both front and rear channels. The HP-filter has two fixed frequencies, 65 or 85 Hz. The HP-filter can be disconnected in position OFF. The LP-filter is variable between 50 and 125 Hz.
