What are the specs of a full range speaker?

Dave I do not ahve a good grasp of this equation, 3db@45hz vs -3db@90hz. Help me out. Yes thats the ones. Did you use the Thor or Odin measurments? Are they the same?
Gee only to 45hz, the Thors. Well then please ck Tyler's System 2, with the 8 inch. What's that measurement look like? I think Ty has it down at 30hz. So yeah I could notice a difference as "clear as a cloudless day". Those critical 30-45hz's might make my classical take on a new dimension.
Yes?

Dave help me out with this: "Thor, The tranmission line (dual 7 inch) produces 4db of bass lift from 20hz to 110hz, with loss less than 1db of ripple....the -3db point is 45hz with roll off of 12db per octave below 45hz. ....Usable in room bass response extends well into the low 30hz range".
They lost me. I see 20hz, 45hz, and low 30hz. Which hz is this speaker producing?

Bartokfan

The measurement is from the "Thor"...-3db at 45hz would mean bass output (SPL) has dropped by around half at that freq. Most speaker systems are rated at their -3db points although how and where the measurements are taken is often not clearly stated.

The 12db figure...bass will be down in level by 12db at the next octave lower...a lot

Usable in room response means...some amount of sound that they deem "usable" will be output at those freq's. By saying in room, I guess they are saying that you will get some amount of bass help from the room....Maybe not in your huge room?

Dave

Dave, from your explantion + the link I looked at earlier today, I finally get the idea of db level.
"with rolloff of 12db per octave BELOW 45hz" That is not much going on in the 45hz range when the amp is at lower volume, which is how I listen.
I think the "inroom usable bass" has something to do with the open baffel in the back, has a interesting baffel system, and so in a large room there will be less, smaller more. As you explain.
Thanks.

Dave...

In your response to Bartokfan

>>>...-3db at 45hz would mean bass output (SPL) has dropped by around half at that freq<<<

Is there anyway to tell at what frequency the speakers output is flat?