bigbassman
Premium Member
Master of all things loud
As we march towards the 12" test session, I recall many a person questioning why testing was stopped on _________ woofer during the 8 challenge with only 100-200 watts because they know a guy that has a 500-1000 watt amp on his and its fine type deals..
First off.... there's a HUGE difference between having a certain power amp on a speaker, and having a certain amount of power on a speaker.. and testing I did tonight will hopefully shed some light on this..
First the details... I used a static 3.4 ohm DCR coil for testing..
the coil has a 1.5" od width, with a 2 layer winding of round copper. length is .43"
the coil was borrowed from a Q power 12.. for the record //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
power was provided via the subwoofer amp of my computer system, and a true RMS clamp and dmm were used for data collection..
for the sine wave, I used a 0db pure wave @ 60hz
for music, I chose 1 rock, and 1 rap song at random.. they ended up being AC/DC Shook me all night long, and Lil Jon Snap Your Fingers, both recorded at the standard reference level
In short.. all 3 tracks were played at the same volume level
volume level was maintained for all 3 tracks.. nothing changed but track, to best simulate a person switching between them in car
temperature was measured via probe, at 5 second intervals. Average power was also sampled at 5 second intervals, and averaged.. the graph reflects a 30 second period of time
peak wattage for the sine wave was 10 watts
peak wattage for Lil Jon was 12.5 watts
peak wattage for AC/DC was 11.5 watts
hopefully this small test will help people visualize why the frequency response testing we do, is stopped for good reason..
on a side note... I hit the coil with 60hz, 85 watts of power, and took the coil to the brink of failure.. 515 degrees F was that limit.. the coil was also stable @ 350 degrees for 10 minutes.. these numbers appear to fall in line with typical coil designs of the present day...
thanks for looking!
Loyd L.
First off.... there's a HUGE difference between having a certain power amp on a speaker, and having a certain amount of power on a speaker.. and testing I did tonight will hopefully shed some light on this..
First the details... I used a static 3.4 ohm DCR coil for testing..
the coil has a 1.5" od width, with a 2 layer winding of round copper. length is .43"
the coil was borrowed from a Q power 12.. for the record //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
power was provided via the subwoofer amp of my computer system, and a true RMS clamp and dmm were used for data collection..
for the sine wave, I used a 0db pure wave @ 60hz
for music, I chose 1 rock, and 1 rap song at random.. they ended up being AC/DC Shook me all night long, and Lil Jon Snap Your Fingers, both recorded at the standard reference level
In short.. all 3 tracks were played at the same volume level
volume level was maintained for all 3 tracks.. nothing changed but track, to best simulate a person switching between them in car
temperature was measured via probe, at 5 second intervals. Average power was also sampled at 5 second intervals, and averaged.. the graph reflects a 30 second period of time
peak wattage for the sine wave was 10 watts
peak wattage for Lil Jon was 12.5 watts
peak wattage for AC/DC was 11.5 watts
hopefully this small test will help people visualize why the frequency response testing we do, is stopped for good reason..
on a side note... I hit the coil with 60hz, 85 watts of power, and took the coil to the brink of failure.. 515 degrees F was that limit.. the coil was also stable @ 350 degrees for 10 minutes.. these numbers appear to fall in line with typical coil designs of the present day...
thanks for looking!
Loyd L.
