List of Reference Level, High Sensitivity & SPL Speakers - Page 11

As these BICs are not compression drivers, but rather soft domes, do you guys think their sensitivity would test much lower than 98 dB?

It's in a Google Docs (Drive) spreadsheet, so I'll look at exporting.

Yes, it's because of the 4 ohms, and manufacturers choosing to play fast and loose with their specs (although JBL Pro does better than most).
My comment in the JBL 4722N's sensitivity cell is: "stated 104db sens is for in-room and not normalized for 8ohm."

Let's look at two speakers: JTR Triple 8, and the JBL Pro 4722N. Both are 4ohms.
JTR Triple 8
Stated Sensitivity: 98dB (1w 1m full space)
As they're already stating it in full space, and they used 1w, instead of 2.83v, it's already comparable to 8 ohm speakers using 1w/2.83v. We don't have to adjust its sensitivity.

JBL Pro 4722N
Stated Sensitivity: 104dB (2.83v 1m)
I believe this is in-room, so adjust sensitivity down ~3dB, to 101dB.
They use 2.83v, so when comparing to another 8ohm speaker measured at 1w, one would be led to believe the JBL's sensitivity was higher than it really is. So we drop the sensitivity down another 3dB, to 98db.

The discussion about impedance normalization was started around post #219 and was resolved in post #245.

Can you link to their statement about sensitivity at 1w/1m? Preferably for a speaker already on the list.

I'm wondering if you assumed 1w, but they really say "2.83v."

This area was tough, as you can see if you look back in those posts. I went from not normalizing at all, to normalizing even the 4ohm 1w speakers, to then just normalizing the 4ohm 2.83v speakers.

Thanks Blazar! I added your Duo Omega ($14,500 each) and the Solo ($6,800 each). These speakers are intimidating...and beautiful. Like a fearsome Teutonic princess!

Here's a link to the Excel file: https://docs.google.com/open?id=0Bxb...UVlMmxzRzduQ1k

Added the Nexo PS10, a pro audio stage speaker.

Any thoughts on where they stand with regard to JBL Pro, Meyer Sound, Mackie, ElectroVoice, etc.?

What's the price?

In post #310 above I'm just looking at what the manufacturers state about their speakers. The JBLs are 6dB more sensitive, according to those two companies, than the JTRs.

Maybe the directivity pattern is different between the two speakers at where you listened (on-axis, versus off-axis, etc.), and that could account for the other 4dB?

I still don't know what speaker you're talking about, but I suspect it might be the 4722N or 3722N, as the chart shows 98dB sensitivity for them, and the JTR Triple 8.

Some other thoughts about reconciling your experiences with those speakers (JBL sounded more sensitive)...

Each speaker probably has its sensitivity measured with differing methods. One could be average of 100 Hz to 10 kHz, the other could be just at 1000 Hz. So if the frequency response isn't flat at the level you were playing, you'd hear differences in their performance.

I mentioned directivity before, but there's also the placement with respect to boundaries, as Bill mentioned. SBIR and comb filtering would give you difference peaks and nulls if their position in the room wasn't the same.

True, and this is a collection of specs, but also I'm trying to iron out some of the lies here and there, so the specs are massaged to compare apples to apples.

If I suspect the sensitivity is as measured in half space, I subtract 3dB, so that all speakers are in full space.

If the sensitivity is measured as 2.83v for an 4ohm speaker, I subtract 3dB.

Most subjectively, if the common wisdom is that a line of speakers misreports its sensitivity, I've padded it down (Klipsch).

In this particular case of the JBLs versus JTR, if we can gather more evidence that JTR over-states their speakers' sensitivity, I'd be willing to do the same pad sensitivity down. Or, if we agree that JBL under-states their sensitivity, I'd be willing to increase it over what they state.