Originally Posted by BeeMan458
Originally Posted by Archaea
Beeman, again, reference spl levels at 10hz from a sub ported higher than 10hz are not going to happen.
A ported sub not be calculated for the purpose of this exercise below a port tune configuration.
Yes, if a single subwoofer. The info came to me via Brian and my reference was personal expectations based on his sharing. I was also informed, agreeing with your above, after 10Hz, the FV15HP, falls like a stone with no breeze in the air. In the case of a "single" FV15HP, no talk below Rythmik's stated single port tune of 12Hz. But in real terms, if two or three FV15HPs are in a room, the total output is very capable of 10Hz performance and yes, this should be considered as it's about total output, not the output of a single subwoofer's output as if synergistic reality doesn't happen.
Just because output is not listed, doesn't mean it shouldn't be part of the conversation. I would rather you be at odds (irritated) with me than condescend for your happiness.
(and at no time do I question your credentials nor challenge my incompetency)
Beeman, First off, lest you think otherwise - - - I really like the FV15HP. I rank it highly subjectively in all the models I've heard and recommend it often, both publicly and through PM. I know what it's good at having heard it at full tilt at the Gorilla83 meet. but also understand subwoofer design limits, and expecting high output below port tune on a ported sub is setting one up for disappointment.
You keep saying a native port tune of 12Hz. Data-bass.com says the port tune is 14Hz. What is the variance? Is there a newer model?
What measuring equipment do you have?
Omnimic, REW? something else? If you don't have measuring equipment perhaps cowboys can bear this test out with his omnimic on his pair of FV15HP.
Here is a simple exercise I propose to clear this up. You now have two FV15HP subs right?
Using a microphone calibrated at least to 10hz (omnimic for instance), play a 10hz test tone on your pair of FV15HP
Download the following track
Disconnect all speakers, except the subs. Play the 10Hz test tone. Slowly increase your volume on the AVR, subwoofer trim, and perhaps even plate amps gain until you notice one of the following four conditions - at that point stop - and record the max SPL you obtained at your main listening position:
1) audible port noise
2) audible sound (a note you can hear indicates high levels of harmonic distortion. Why, because you cannot hear 10hz, so if your subs are capable of producing 10hz cleanly - there should be no audible sound on the 10hz test tone at the SPL levels you expect to obtain)
3) the sound of mechanical distress - (hard bottom, soft bottom, surround ripple/flapping, etc - my experience with the FV15HP is that it has very solid distress limiters, so you shouldn't really encounter much here)
Report back: A informal video recording of the test will generate bonus points.
I predict it will be no where near 115dB at 10hz. Not with two, not with three, not with four, not with more.
Report back. I'll happily give you a public touché if I am wrong.