Do I need a low-pass filter / crossover?

[AudioDan]

Need some advice- powering and outdoor subwoofer (Near IGS12) with an Audiosource ad2002. My source is a sonos connect. My question is that neither the sonos or the Audiosource amp has a low pass filter/crossover. So three questions-

1- do I need one at all?
2- If so, passive or active?
3- can you recommend an inexpensive brand/unit?

 

[highfigh]

Need some advice- powering and outdoor subwoofer (Near IGS12) with an Audiosource ad2002. My source is a sonos connect. My question is that neither the sonos or the Audiosource amp has a low pass filter/crossover. So three questions-

1- do I need one at all?
2- If so, passive or active?
3- can you recommend an inexpensive brand/unit?

What are the main speakers?

If you want to play the music loud and the main speakers are small, yes- use a high pass crossover.

If you don't want your subwoofer to intrude into the upper bass region, use a low pass crossover.

You don't lose signal level with an active crossover.

Here's a low priced active crossover- I have used a couple of their small mixers and they work well.

https://www.parts-express.com/rolls-sx45-stereo-two-way-mini-crossover-w-sub-output--245-1184?utm_source=google&utm_medium=cpc&utm_campaign=pla&gclid=EAIaIQobChMIm9H-p5Sg4gIVx_fjBx0jdwwHEAQYAiABEgLAOvD_BwE

 

[ski2xblack]

1- do I need one at all?

That sub inherently band limits the output due to it's isobaric loading, but even so, the product page does suggest a shallow slope hpf. No hpf frequency cutoff is specified.
Need? perhaps not, but without the hpf you'll be more prone to hear mid-bass and lower midrange content, such as male vocals, emanating from the rose bushes (or wherever you have that sub placed/buried).

2- If so, passive or active?

Active is the better approach, performed in an amp w/ dsp capability, and also able to drive the 70v distributed setup. (You may want to further describe your setup, as 70v is more a commercial application, which folks here, like me, are less familiar with.) Alternately, since you only need a shallow slope hpf, you could simply use an f-mod line level hpf in front of your Audiosource amp (these are available at Parts Express, very cheap).

3- can you recommend an inexpensive brand/unit?

THIS is what the manufacturer sells, but there are equivalent amps available from Crown, QSC, etc. that may provide the same functions for a better price. Of course you already have an amplifier, so going this route would be far more costly than trying an f-mod.