How should driver testing "sound" ?

[bean438]

So I have my 15" Dayton hooked up and running 30hz @ 11.4 volts.

I can hear a bit of the sound, but more likely the vibration of the driver. If I stand directly over the driver I can hear more of a tone, but as i step away it is vibration only.

I can also hear a "flutter" type sound, like a butterfly.

There is no clanging, ticking, knocking etc.

Just wondering what i should be listening for if the driver was defective.


Thanks guys

[Dave Non-Zero]

The flutter is probably air noise out the back vent of the magnet. Do you have the speaker hanging in free air or on a surface. I found propping the magnet up a bit stopped the air noise. I think a defective speaker sounds exactly that- defective. buzzing, rasping, etc are all bad signs. What you describe sounds normal.

[bean438]

It was sitting on a concrete floor.

I propped one end on a block wood, and now the flutter is gone. There is still a "rumble" when I stand over it, but when I am 5 feet or so, or more away I can barely hear anything.

It sure is getting a workout. The cone is moving pretty fast, but not much travel.

[Tom Smit]

And so all is good.

[bean438]

Does the break in have to be continuos?

I had to recharge my ipod, which has the test signal. Went about 6 hours, break for 2, and now back on over night.

I was surprised at how hot my stereo receiver got! On the back it says 4-16 ohms. I put a fan in front of it to keep things cool.

[Tom Smit]

Yes, the time can be broken up;it's the total that counts.

[Dave Non-Zero]

Sine wave is the most power intensive and demanding signal so it's asking the most from your amp longterm. Here are my lab 12 drivers breaking in at about 12v 30hz.

[AntonZ]

Great vid, Dave, thanks for sharing. What a superb way to brighten up the otherwise most boring aspect of any sub build