Originally Posted by DavidMountney
Do unused subwoofers in close proximity of other subwoofers in use affect the response of the ones being used? For example, if I want to assess two different subwoofers and set them beside each other for A/B comparison, will the one not being tested have any impact on the response and output of the one being tested? In my application I am using passive subs but the question applies to powered subs as well. Any thoughts? Thanks.
That's been a controversial topic in audio for decades.
Back in the 1970's Ivor Tiefenbrun, owner of Linn Products, required any dealer selling his products to have a separate, one speaker demo/listening room. The logic was that any un-powered speaker(s) VC/cone assembly in the same room would vibrate/resonate sympathetically with the powered unit and color the sound of the unit your were listening to.
It's not rocket science. You only have to lightly touch the cone surface of the un-powered speaker with your finger tips to feel the cone moving. If it's vibrating it's moving air and making noise. But then, so is anything else in the room that is vibrating. So, is it enough to make a difference? If a tree falls in a forest and no one is around to hear it, does it make a sound?
The difference can be measured with the right equipment. Most high end/expensive audio product brick and mortar stores that are still in business have a demo room set aside for demoing a single set of speakers. This compared to a place like Best Buy/Magnolia with multiple speakers lining all 4 walls of a demo room.
And then there is the fact that final frequency response range and a speaker's sensitivity value is measured and verified with the unit standing alone, by itself, in an anechoic chamber.