I know this isn't RL related, but figured this is the best place to ask. I recently installed a set of 8" coaxial ceiling speakers in our main living area as well a pair of two-way exterior speaker on our back deck. Both pairs are driven by a centralized stereo receiver with Bluetooth and A/B speakers that I wired in our hall closet. The frequency range on the ceiling speakers is 55hz to 20k and the outdoor ones are 65hz-20k. So far, we're loving the setup, but I'm a little disappointed with the bass output at lower to mid volume levels. The receiver I have is very basic and only has a "bass" and "treble" setting that goes from -10db to +10db. I'm not certain where the cutoff points are for these settings and it doesn't seem to help all that much with the bass output. The receiver is 100 watts per channel. It and the speakers will play very loudly without any distortion, so I know power isn't the issue. It just seems to be a matter of where the "boost" is applied with the bass and treble settings. I was thinking a 7- or 9-band equalizer in-line such as the Behringer FBQ800 would help this issue. I've never had any experience with them and really don't want to spend an arm and a leg for it. Can any of you esteemed audio gurus provide some advice as to whether it would help or if it's a waste of time and money?
Well, you asked for it Ian. Stand by for a bunch of bull snot you didn't ask for.
Funny thing about ceiling speakers. Some users don't expect much from them other than ambient/low level background sound or rear channels in a surround system. Others think of them as primary listening sources. Those expectations result in very different levels of satisfaction. I'm guessing you are among the first group - who don't expect amazing audio quality but rightly expect some fairly balanced audio from 8" coax's.
Having read your posts, you have a good handle on sound related topics so it's a safe assumption you already did the visual polarity check thing. But I gotta ask... did you listen for polarity? More than a few times in my experience, a visual check says everything is connected correctly, but an audible test proves otherwise. Might be worth a try as a sanity check.
Every speaker - indoor or outdoor - is the same when it comes to the affects of polarity on low frequency reproduction - so an audible check is always a good idea - add the great outdoors to the equation and issues with achieving pleasing bass reproduction grow exponentially. When a speaker plays into the (more or less) infinite space of the outdoors, low frequency tapers dramatically because there is no "room gain" to speak of. The EQ you mentioned will make a woofer cone move farther in its X axis, but that means pushing it harder than it might be comfortable handling. The short answer is the Behringer EQ is a good choice as long as your speakers can handle the extra excursion you'll ask them for when boosting power @ 63hz.
I know you don't want to spend a bunch of bucks - and variables like aesthetics, running cables, power sources, the space you are dealing with, exposure to the elements and other things are huge factors in what you could do or want to do, BUT... if it's within the realm of possibility, a dedicated woofer is by far the better solution for increasing low frequency output outdoors.
As an example: a friend has a nice looking Yurt style pole barn on his property that he makes available for weddings, private parties and such. A while back, we put together an outdoor system on a budget. We ended up with a multiple sub/satellite system that sounded better than OK. For subs, we used several Goldwood MDF vented cabinets, stripped the automotive carpet coverings, rolled the surface(s) inside and out with rubber coating & slapped in the cheapest dual VC drivers we could find. The result was a bunch of (more or less) weather tolerant sub enclosures that sound danged nice for right around $100 each - they are still up and running today. The subs aren't fully exposed to weather but they've handled a couple of years worth of ambient moisture, humidity, heat and cold - and have done so admirably. Over time, he's moved them around and devised a couple of creative cosmetic/functional solutions, like stuffing one in a cedar utility chest or burying them inside hollowed out hay bails. You get the idea. There might be a way to build something relatively inexpensive, integrate it into your environment and have it sound way better than what an EQ could do for you. Parts Express has the items mentioned here. Try this on for size. $33 cabinet + $27 woofer $30 low pass filters = $90. Add some coating and you're @ $120-ish. The Behringer is what, $70? If the dedicated sub were possible in your situation, double the price of the EQ would be well worth the listening pleasure a guy like you deserves. Did I mention I'm on commission? LOL.
$33 - 10” vented enclosure:
http://www.parts-express.com/goldwood-e-10sp-10-single-vented-box-speaker-cabinet--260-628
$27 dual VC 10”:
http://www.parts-express.com/goldwood-gw-410d-10-poly-dvc-subwoofer--290-362
Anyhoo, the EQ will certainly add flexibility to your system. And it'll be an easy plug and play solution. If I understand the system described, the EQ would be connected in pre-amp-out/amp-in loops on the receiver, or perhaps a send/return facility of some kind. That would mean adjusting the EQ would affect A&B outputs, which I assume are inside/outside spk systems. That'll work of course as long as making A sound the way you like doesn't make B sound like mosquito farts, or Rhinoceros burps, or visa versa. IMO: your idea is not a waste of $. The ceiling spks will probably handle what the system could throw at them and as long as the outdoor spks will handle low freq power increase without complaint, you'd be sitting in tall cotton - as they say down south.
Best of luck.