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In Reply to: RE: HK/Limage posted by Satie on June 21, 2014 at 13:26:36
Just to clarify, Satie...
Your experience is that moving from five feet to eight-ten feet (from front wall) does not reduce mid or upper bass relative to lower bass?
I assumed this was an artifact of the base wavelengths rather than just a room anomaly . I assume a lot though and have zero training in the field. Always glad to learn.
Follow Ups:
Moving the speakers away from the front wall reduces midbass and deep bass but not in such a big way and not the one significantly more than the other. The lean midbass you observe was there before too wasn't it? It just got worse moving the speakers into the HK/Limage position.
You had a toe in for the speakers before that would have allowed the resonance from the width of the room to get excited. That would have contributed to midbass with the primary 80 hz resonance of the 14 ft wide room and the first harmonic at 160hz. In the HK/Limage setup there is no excitation of that mode because the sidewalls see the dipole null and no direct radiation till further down in the room. You can test it out with the toe in angle- as you go up in toe in you should notice less deep bass and more midbass as you decouple from the long room length and couple the shorter one.
The other thing is the degree of bass loading provided by the sidewalls. That increases as you push the speakers towards the sidewall to reduce the width of the slot between them. That reduces the degree of dipole cancellation on that side so leaves more of the bass driver's tuned resonance peak uncancelled at the listening position.
The midbass enhancement from the DWM should be well beyond enough to fill in for both the loss of the room width's resonance peaks and for whatever else had been reducing midbass in your room.
On another note, your 3.7i is still rather new and if you hadn't been playing it at lease breaking levels then it will take some time to loosen the midbass.
Thanks Satie,
I was referring to the measurements with my IIIa's. I am still just breaking in the new guys.
In my room, I got the most even upper bass and mid bass at about five feet from FW. In other words, conventional setting.
Twelve inches or so from side wall with minimal toe in with the speakers almost to mid room I got pretty much flat bass from 50 to 25 hz but about a five to seven db suckout from 160 to 80. The DWMs fill this gap perfectly.
If I toed the speakers in I got muddy sound. (Interestingly this does not seem to be the case so far with the new speakers)
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