• Prosound Shootout

After 6:00pm, the track will have car races. That night is test-n-tune, when racers are running and calibrating. You can even bring your car and run it if you want. There will be everything there from street cars to nitrous burning ground pounders. It will really be a lot of fun for the price, and you can come and go as you please through the day and evening.

The racing complex has all the power we'll need, 110v, 220v even up to 480v three-phase. So we're set for power. The stadium seating on the north side of the track provides cover, so should we get rain, our equipment won't be exposed.

I'm really looking forward to this. It should be a great time on several levels. We can test and examine our sound equipment all afternoon, and check out the cool cars all evening. Everyone is welcome, DIY and pros, so please come on out.

If you need suggestions on hotels or anything else about the area, please contact me. Information is available on the website at www.ProsoundShootout.com. If you intend to be there and want to have your gear listed, please let me know and send some pics. I'll put it up so people can see who's coming. We'll also post photos and test results after the event.

1) Impedance sweep, cold.

2) Impulse response.

3) Frequency response w/SPL at 1W/1M, 10 Hz to 20 kHz (Measured at distance and corrected to 1M)

4) Frequency response (20 Hz - 200 Hz) w/SPL at 3dB increments to rated power or physical limits. (This will show heat compression and max SPL)

5) Distortion at 110dB (20 Hz - 200 Hz) and then at 3dB increments from there to rated power or physical limits. (This will indicate the practical limits of the system regarding usable maximum clean reproduction.)

6) Run heat soak signal 15 minutes at 80% power, repeat steps 4 and 5.

7) If required, processors can be applied and tests 2, 3, 4, 5 and 6 repeated.

8) Single horn tested first, pairs or groups tested next if desired.

9) Subjective listening test using a selection of identical program material played at a referenced sound level.

10) Subjective listening test using a selection of identical program material played at the maximum sound level of the loudspeakers.

I'm really looking forward to this. Especially meeting you Wayne and seeing your thermal heat sink.

The thing to be concerned with is the heat soak signal, but even that isn't going to be run so long that it would likely hurt the voice coil, even at full rated RMS power. If we ran it an hour, then it might though. What we'll be doing is to run at 80% rated power, which in your case is 240Wrms. That will not heat the driver to damaging levels, so it will not harm your driver.

• JBL SR Series