Originally Posted by vinnyg747
Really ? Looks like the M15 has an advantage over both of these subs from 12.5 - 31hz range. Unless I'm reading something wrong.
Output isn't FR/extension. The two often correlate but they are very different metrics.
"extension" refers to the frequency response of a product---usually measured at a nominal 85-90dB.
"Compression graphs" show how the frequency response changes with volume.
I'm probably getting a bit pedantic and apologize if so.
Another important thing we need to keep in mind is that cea-2010 output is irrelevant without looking at the system FR. We tend to "oooh and ahhh" about a 10/12.5hz score(when most subs don't register cea-2010 that low) but if the FR is down 25-30dB at 12.5hz...what difference would it make? Are you EQ boosting the signal 15dB(let's say room gain gives you 10-15) at 12.5hz? No? Then don't worry about 12.5hz because it's never going to be reproduced (audibly)anyway.
Another pet peeve is pooh poohing mid and upper bass efficiency and on focusing on a single frequency like 16hz. (not saying that is what you did).
I'm not sure who posted this originally but it represents the problem well(see attached).
You can move the cea tone burst to 15hz, or 20hz or 25hz or whatever. That is such a tiny little burst compared to a typical "bassy scene" in a movie. Now, let's say you have two subs.
Sub A hits 100dB (cea) at every frequency from 15hz to 100hz.
Sub B hits 103dB (cea) at 15hz and 20hz. 100dB at 25hz and 31hz. Then 97dB above 40hz.
Many look at those cea scores and assume "okay, sub B will be stronger 25hz and down for sure". But that's not accurate. Look at how MUCH information is 40hz and up.
Sub A will be significantly less taxed in the mid/upper bass.
Eventually I think we'll see the CEA protocol include input signal more indicative of true source material. I'm trying to come up with something like this in house. What would it show for the above two examples? Maybe more like this.
Sub A hits 99 at every frequency
Sub B hits 99-100 at 15/20/25 and 96 above 40hz.
If someone had the vtf-3/fv15/mono15thx all for a listening session I wouldn't be surprised if they did have a preference for the mono15. It's a very powerful product. Now, put the fv15hp against the mono15 and I'd bet it's a toss up. But you're talking two standout subs so it's not like there's a bad pick. Not really a bad pick out of the entire field of four. Oh and the listening sessions would be a large variety of movies and real music not just the opening 10 seconds of EoT looped or "bass I luv you"..
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