Sound Pressure Readings

[Retread]

Below are sound pressure readings for my system taken under the following conditions: (1) Radio Shack analog SPL meter with recommended corrections; (2) warble tones from Hsu-provided CD; (3) after using automatic setup feature of Pioneer VSX-D912K recommended by Sasha; (4) no room equalization; and (5) average of SPL measurements at three viewing/listening positions. Oh, and the system is Ventriloquist with VTF-3R.

All in all, the system looks pretty good in view of not having room equalization. Of course, the measurements at the three viewing positions are more "bouncy" than the average. It looks like I have some issue with the 100 Hz low pass in the receiver, and that I need to do some room equalization at 20, 40, and 80 Hz. But pretty good. I'm particularly impressed with the 16Hz response, even if I can't hear it.

Hz SPL
16 0
20 +3
25 0
31.5 +4
40 +6
50 +2
63 +3
80 +3
100 -3
125 -1
160 -1
200 0
250 -1

[Michael Bain]

Those are very good measurements. What tuning mode do you prefer to use for most of your listening, and have you tested how much these measurements change with the alternate tuning mode?

[Retread]

I use the extended tuning mode. Never tried the one with both ports open.

Since I posted those numbers, I've reduced the sub volume 3 dB, and cut the "thump puppy" sound. The Radio Shack SPL meter is extremely useful.

I suspect the new Radio Shack digital SPL meter will have the same correction factors. The sound head looks just like the one on the analog meter. The difference is likely to be that it's more difficult to judge average on a digital that's bouncing than it is on analog. The eye just natually judges the average on analog. Dumb thing to substitute digital.

I'd like to recommend "Band of Brothers," second segment, on DVD for demo. This is the one that begins with the jump into Normandy, with horrific flack. There's a lengthy segment in which Easy Company has to attack a group of three German 88s. The 88s are most impressive, and the bullets whizzing around your head in surround sound make you look for a foxhole.

[Ddavidson]

If you have not already voted in the VTF-3 prefered tuning mode pole, "please do" as it is important that the prefered mode becomes well known to Hsu. They need customer preference information for future subs and variations of subwoofers.



Ddavidson

[Retread]

Originally posted by Ddavidson
If you have not already voted in the VTF-3 prefered tuning mode pole, "please do" as it is important that the prefered mode becomes well known to Hsu. They need customer preference information for future subs and variations of subwoofers.



Ddavidson