Guess How Big My Speakers Are

Jensen Coaxials in ConcreteBoxes.

Good answer.

I don’t know. But you could have saved 15% with geico. 

Size doesn’t matter.  It’s how many springs you put them on.

Not that it matters that much, but my distances for the speakers and listening location were off. 

8' apart, center to center, and 8' from the plane of the speaker's to the microphone  location.

I believe you have some Monitor Audio or Wharfdale floor standing speakers?

Nope, nothing fancy like Nelson Pass published in his paper about high impedance amps and speaker matching. 

Speakers are being driven by a quite normal Luxman 507ux.  I mean, I like the Luxman, but there's nothing unique about their specs.  Just a decent solid state amp with reasonably low output impedance.

If the amp has a high output impedance the speaker might have a much higher output in the bass resonance area than one would expect. Nelson Pass demonstrated this at a RMAF about 10 years ago using a current source amp and open baffle speakers.

The distances from the wall also influence the speakers; if inside the room boundary effect a +3dB per octave gain will be seen from about 100 Hz down.

I'm thinking this could easily be a 2 way ported box with 8" high excursion woofer.

your listening situation tells me that you have medium sized floor standers similar to Paradigm Studio 100 or Sonus Faber Grand Piano.

The Bose Wave measures better than I would have thought.

Where is the King of WB when we need a pronouncement?

3 way bookshelf

I give up.  How big are your speakers?

Speakers are about 11' apart, with a listening/mic location about 12' from the plane of the speakers.

This is most definitely an in-room response sort of scenario as opposed to quasi-anechoic (i.e. not close microphone).

This could be the curve of any loudspeaker because Erik has not told us where the mic is. You can get that kind of bass out of an LS3 5A if you put the mic one foot away from it. The mic is obviously farther away as you can clearly see room nodes in the bass. There is a strong one at 30 Hz which is boosting the bass but 20 Hz is 8 dB down and is down even lower at other parts of the room. I would guess without the node the speaker starts rolling off at 40 Hz. Volume also makes a difference. This is probably a smaller tower or medium sized bookshelf speaker. Something with two 8" woofers or one 10" 

Since that bass response would make everyone thing of large floorstanders, I'd guess bookshelf monitor size...or the post would pose far less intrigue 😉 

Cheers,

Spencer