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Cab size/room size

A 1x12? I expected at least a 4x10 or larger. Here is my bedroom rig and it isn't too much.
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I had trouble with Markbass 121p combo[1x12] 'booming' on 'D' notes on bass in my room at any level above Quiet
used EQ at first to lessen effect but getting Combo about 15" off floor[ on top of 1x12 cab not plugged in:)] got rid of it so could get medium loud [more than needed] with no problem

Room is 10' x 12' and have only 1 area to place equipment; so could only experiment slightly with position

Now I have Mesa WD 800 and Subway 1x15 no problems sounds great at any level; Go Figure

So I don't believe speaker 'size' is culprit
 
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My music room (and rehearsal space for the band) is 16'x18' with three open doorways, two of which are dead in the corners (which helps avoid some bass buildup there),

but it's still indoors in a not-so-big room, so I can't really hear what it's doing accurately.

If I'm just playing, say testing out a new cab, I have no idea how loud I really am. I suspect I crank it up too loud and start to hear things I shouldn't be hearing, both from the cab and other things in the room.

When playing along with music or with the guys, I find that it sounds much better 'cause I'm actually at a much lower volume.
 
Can a cab be too much for a room? My practice space is a former bedroom, roughly 12 feet by 15 feet. My current practice cab is a Barefaced Super Compact 1x12, 600 w. I'm using a Quilter Interbass to drive it, 33 w. at 8 ohm, and it's plenty loud enough for me. But the acoustic results are not good. I've experimented with a couple of bass traps, and they help some, but I'm starting to wonder if a smaller cab would be better.

Any suggestions?
Compared to a Bag End 2x10, the Super Compact puts out way more lows. (The cabs are the same dimensions) I've been rolling the bass eq back for the first time in my life! It's easy to over pressurize a small room with bass and 33 watts through an SC can be pretty loud! Bass traps are good for smoothing out the sound. Maybe try putting the cab on the 15ft wall, raise it up a couple of feet, move it out from the wall if there's enough space, and keep it away from corners. (It's a hifi audio approach and may not make a diff)
 
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Some notes might be such low frequency (and long wavelength) that they take more than 12 feet to fully develop. So basically the resonance of your room may be reducing some of your lowest frequencies.
 
My music room (and rehearsal space for the band) is 16'x18' with three open doorways, two of which are dead in the corners (which helps avoid some bass buildup there),
Guess which rig sound the best in this room...

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Yeah, the little one. One of those 4x10 also works well, a better cab, and you can feel that sucker hit you.

The larger cabs I can really crank up the power (750 to 1,000 watts), and I still can't really hear it that loud, completely different from a bigger room (like a bar) or outside. :)
 
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I just recently purchased a Darkglass212 and have been trying hard to dial it in before a gig.

The cab is powerful, loud and just way too much for my small basement studio.

My studio in my basement has a giant air conditioning return running straight through the room with 7.2 foot ceilings.

Bass is not an ideal instrument here.

Tried to mitigate the sound by loading the ceiling with insulation and 1 inch of Sheetrock.

The bass knob is turned down to allow me to not blow my ears and room apart.

Then when I hit a gig, a thorough sound check is in order.
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Some notes might be such low frequency (and long wavelength) that they take more than 12 feet to fully develop. So basically the resonance of your room may be reducing some of your lowest frequencies.

That’s a common misconception, but that’s not how sound waves work. They are fully formed as soon as they launch from the driver. They don’t need “space to develop”.

Room resonances are indeed a factor though!