Originally Posted by bradthebold88
Yes, but with that 300W amp, he was past the thermal limit of the driver according to him. So that is probably the max power of the F20, or less to be under the thermal limit.
I don't know how much power was used on the SI, but I was using the max long term average measurement, not the max burst measurements. The max long term average isn't a limit-pushing, dangerous measurement, is it? From it's name, I would guess it is the max power you could use over a long time period, haha. What is the definition of a max long term average then? Would that use a power level that would be safe for a long term use of the driver in a home theater?
The max burst output of the SI at 100Hz was 123db. The max long term average at 100Hz was 113dB. So even if the full 12,000 watts was delivered during the max burst, the long term average was 10dB lower at a reasonable 1200W. Based off that, it looks like the max long term average of the SI is using it's max safe power.
I'm not trying to crap on the F20, it puts out a ton of output with a lot less power, I'm just trying to compare the max safe output of the 2 with their own individual max power levels.
Then stop comparing apples to oranges. The F-20 is a simple to build bass horn that used an inexpensive driver and makes a lot of noise. An 18 in a sealed box is not the same, and is not a fair comparison.
As far as thermal limits? I'm an end-user, a consumer. I don't set thermal limits. The engineers that designed the drivers do. Eminence rated the MFW at 225 watts.
According to that same credo, the stereo integrity has a thermal limit of 600 watts
Doesn't really matter what Ricci tested them at. Just cause you can pour the power to it short term and get away with it doesn't mean you should. The folks at Stereo Integrity are on the record re-affirming the driver's 600 watt thermal limit. Jerry McNutt and the crew at Eminence rated the MFW at 225 Watts, but Seaton used double that, I split the difference, and chose a number that corresponded to a cheap, yet decent amp that is widely available.
Why did I test with such a cheap amp? Cause you didn't send me that LabGruppen FP14000 or that Powersoft K10 that I asked for.
Seriously? Because it is what I have to work with, and as the F-20 was all about most bang, least buck, I figured using what I have and what others would likely use would be a fair test.
I'm a hobbyist. Nothing more. I do this stuff for grins, in my spare time, with some of my spare funds. Not everyone has the discretionary funds or available time to destroy drivers and push things to their absolute limits, regardless of what the forums want to see. Sure - I coulda pulled out my EP, bridged it and really put the coals to the F-20 during testing. The numbers woulda got a bit higher, but with swept-sine sweeps, I would have killed the driver dead on the next sweep (~600 watts applied). I lack the cash to use the sophisticated burst testing techniques Josh uses, so I'm "stuck" with REW - which is a FANTASTIC piece of software, I wish all the software I was "stuck" with worked as well. Swept-sine testing is BRUTAL, and will kill a driver deader than dead before you can turn it down. Since I can't exactly wave another driver in without spending cash that goes towards other things, I tend to honor the driver's limits as set by the folks that made em.
Looking only at maximum output without considering bandwidth, distortion, and power requirements is a bit short-sighted.Edited by lilmike - 4/25/13 at 9:42pm