Hey guys.. If you're like me you have tons of links for subwoofer setup. On a facebook page I put together a compilation of those links for guys to easily find info. Of course this stuff isn't my info but a compilation of great guys around here and other places who've helped us all out. Here's a copy and paste.
For those who want to get their subs tuned to perfection!
First why is one sub a really bad idea
..unless you have one seat! Figure 1 in the link below says it all. But here's a quick view before you click on the link. This is why one sub is just bad!
So where should multiples be placed..theoretically?
Well if you're here you must be tired of boomy bass here no bass over there ... you know the common issues with a single sub. It's impossible to get smooth bass seat to seat with a single sub.
First off...Get off the floor you're scaring the kids!
If you have multiples they interact with each other. This means crawling around while a sub sits in your chair is useless once a second sub is turned on as the integration changes everything.
But you're in luck...especially if you have a rectangular room. The link below will help guide you in deciding where to put them and what to expect... measurements are still highly recommended. If it's an odd ball shaped room or has openings in the wrong places just experiment and measure....measure even if it is a rectangle. You'll have to measure anyways for the electronic tuning.
So where exactly should multiples be placed..theoretically?
If the link doesn't work google "harmon multiple subs".
Also skip to the 1 hour mark of this video for the section on multiple sub placement... then go back and watch the rest of the episode and accoustics 101 too.. priceless info.
Where should we sit?
Harmon has once again given us some extremely useful info. This is the best room mode calculator I've found. Of course as explained in the video above we can sit in the nulls If we must, we just need to properly place the subs to fix the nulls as best we can. It's best to just avoid them especially modal issues above the subwoofers range.
, Why sitting in the money seat and adjusting Multiple sub SPL is leaving performance on the table!
between multiples and Integrating your subs with the mains...as you can see this can not be done to any to any high degree of success by ear, actually it's a sure fail. Adjusting a single bass tone so it sounds loudest is aiming for an out of phase setting. It's also ignores other frequencies which could be in a null. Once you start to measure you'll see how easily an out of phase system can cause peaks just as it can nulls and reallize how worthless doing this by ear is... getting it right takes lots of patience even when measuring... it's easy.. just a tedious process.
I will add that if your AVR has dual sub outs and during measurement 1 it pings each sub separately it has the ability to adjust phase for you so you may be able to skip the step but you still need to confirm as it's hit or miss and often ignores adjacent seats. If you have multiple rows or more than 2 subs you'll need to manually do it. The one issue with using dual outs is that it SPL matches when we want gain matching.
So you've spent hundreds or thousands on gear.. spend a measly $100 and Get a Mic!
If accurate bass and getting all the perfomance you can means anything to you.. get yourself a Mic such as this one... It's the best $100 you'll spend.
If you don't have an Inuke with DSP or another way to EQ the subs, you can get one of these. They can adjust phase and EQ, set filters etc.
The standard is severly limited with only 7.3 ms of delay which is fine if the subs are say all up front but often they need to be spread around the room along side walls or rear corners too and you can easily find you need more delay. The answer is the 2x4 HD. 80ms of delay and more resolution. Definitely worth it.
Both of these accept REW EQ files so you can use REW to match a response to your custom target and load the file into the minidsp in seconds.
Read the links below and get to work.
To get your Pc and HDMI talking with REW.
https://www.minidsp.com/applications...dmi-on-windows Don't forget to read the part about ASIO4ALL file. Many miss that part and have fits trying figure out what's wrong.
Watch how it's done
.. check out the links below!
One of the best walk thru's I've seen. This one walks thru aligning the subs phase to mains As well.
A little inside view from Mark Seaton (the Master when it comes to this stuff) during an install . You'll see we emulate his setup methods.
For those of us with Inukes
.. Here's a link to get around the baked in 20hz HPF. https://www.avsforum.com/forum/155-d...z-dcx2496.html
I just want to add that the above is geared toward a flat response. Keep in mind flat is boring. Our ears interpret Low frequencies and upper frequencies differently, A little boost as the frequencies drop sounds more natural. Dynamic EQ is based off of this principle. I'd recommend experimenting. Try flat. Then Use REW to set a house curve as a target and see what you like or use Dynamic Eq
Here's some great info including a way to find what sounds right to you.
Basically measure the SPL of an 80hz tone on an SPL meter. Now play a 30hz tone and change the volume until it sounds equal in level to your ears. Then measure the SPL of that 30hz tone. You should notice the 30hz tone is maybe 8db give or take louder. You can use that to set the target of your house curve.
And here's my personal raw response of my 4 corner loaded subs at one seat.
And here's the aligned response at 2 of my most used seats with my house curve. I have a very tight response at all 4 of my main row seats.