Any of you guys blown drivers? - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

Old 06-08-09, 09:02 PM Thread Starter
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Fredm

Join Date: Aug 2008
Location: Houston, TX
Posts: 150
Re: Any of you guys blown drivers?

I think 400 watts is 400 watts. No matter how much resistance the VC has.
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Old 06-09-09, 06:17 AM
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Mike

Join Date: Apr 2007
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Re: Any of you guys blown drivers?

Modeling shows otherwise.
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Old 06-09-09, 06:57 AM
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Tech Guru

Join Date: May 2006
Location: Gainesville, FL, USA
Posts: 11,121
Re: Any of you guys blown drivers?

Quote:
fredm wrote: View Post
I think 400 watts is 400 watts. No matter how much resistance the VC has.
Consider what you just said...

Solving 400W = V**2 / 8 ohms gives V = about 57 Volts
Solving P = I * V gives I = about 7 amps

Solving 400W = V**2 / 2 ohms gives V = about 28 Volts
Solving P = I * V gives I = about 14 amps

Now, assuming your amp can deliver the current, which 400W is more likely to reach xmax? Which produces the greater field in the voice coil, 7 amps or 14 amps?

Of course,the assumption about the amp being able to deliver the current is not trivial. Which condition will land the amp on my service bench sooner?

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Old 06-09-09, 11:59 AM Thread Starter
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Fredm

Join Date: Aug 2008
Location: Houston, TX
Posts: 150
Re: Any of you guys blown drivers?

electric field is based on voltage and amps. A coulomb can be defined using both. Why are you only looking at the amps?
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Old 06-09-09, 12:52 PM
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Re: Any of you guys blown drivers?

Because it is the current that matters when creating a magnetic field in a coil. You can have all the voltage that you want, but the current will define the field.

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Old 06-09-09, 01:21 PM
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Josh

Join Date: May 2007
Location: Louisville, KY
Posts: 2,431
Re: Any of you guys blown drivers?

I've blown a few drivers in my younger and dumber days.

Fred,
The modeling predictions are just that and assume that things are staying perfectly linear. It usually takes quite a bit more juice than predicted to mechanically damage a driver. At the edges of things the amp will be running out of gas, the drivers motor force is dropping off, the suspension is tightening up, the port may be compressing, the vc's are probably heated up enough to change the response slightly, thermal compression may have set it and a whole host of other issues. Not to mention that your electronics chain, everything from the disc player, to the receiver, to the amplifier, is combining to roll off the extreme <10hz response too. All of that together means that you may not have any danger at all with no dedicated HPF in your set-up. That SS SPL170 was a beefy car sub in it's day and was built to take quite a bit of abuse. I'm not surprised that it is unphased by 380w HPF'd, or not. It wouldn't hurt to add one though.
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Old 06-22-09, 04:22 PM
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Dylan

Join Date: Apr 2009
Posts: 1,358
Re: Any of you guys blown drivers?

How hard would it be to blow some store bought completed subwoofers like Yamaha's and Klipsch with everything stock? I am worried about blowing my KLH sub, but don't think it can happen with a 150w Yamaha amp...
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Old 06-22-09, 04:29 PM
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Tony

Join Date: Sep 2007
Location: Edmonton, Alberta, Can
Posts: 14,816
My System
Re: Any of you guys blown drivers?

You can damage a speaker by under powering it as well, distortion can cause all sorts of issues. How much wattage is the KLH rated for and what is the frequency responce?

Home theater:
Onkyo 805, Yamaha YDP2006EQ, Samson Servo 600 amp
3 EV Sentry 500 monitors across the front, 4 Mission 762i's Surrounds, SVS PB13U sub, Panasonic BDT220, Harmony 1100, Nintendo WiiU
Panasonic PT-AE8000 on a 120" 2,35:1 fixed screen

Living room system:
Sherwood/Newcastle R972, Mission 765's, SVS SBS02's, A/D/S MS3u sub, Yamaha YDG2030EQ
Yamaha KX-393 Tape deck, CDC 805 CD changer, Panasonic BD60, Sony turntable PS-T20
Panasonic TC-P50ST60, HD-PVR & WDTV Live, Harmony 900

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Old 06-22-09, 05:07 PM
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Dylan

Join Date: Apr 2009
Posts: 1,358
Re: Any of you guys blown drivers?

The frequency response of it is 30 to 40-180hz, and the rated power is 100w. The stock KLH amp went out, so I am just using the Yamaha 150w amp from this sub found here: http://www.yamaha.com/yec/products/p...6&CTID=5003300

Thanks
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Old 06-22-09, 05:11 PM
Elite Shackster

Tony

Join Date: Sep 2007
Location: Edmonton, Alberta, Can
Posts: 14,816
My System
Re: Any of you guys blown drivers?

Thats fine, the amp is well suited for that driver however it is very possible to blow the sub with that amp if your feed it material with lots of subsonic frequencies. As long as you have the receivers crossover set properly Just keep it low and you will be fine.

Home theater:
Onkyo 805, Yamaha YDP2006EQ, Samson Servo 600 amp
3 EV Sentry 500 monitors across the front, 4 Mission 762i's Surrounds, SVS PB13U sub, Panasonic BDT220, Harmony 1100, Nintendo WiiU
Panasonic PT-AE8000 on a 120" 2,35:1 fixed screen

Living room system:
Sherwood/Newcastle R972, Mission 765's, SVS SBS02's, A/D/S MS3u sub, Yamaha YDG2030EQ
Yamaha KX-393 Tape deck, CDC 805 CD changer, Panasonic BD60, Sony turntable PS-T20
Panasonic TC-P50ST60, HD-PVR & WDTV Live, Harmony 900

tonyvdb is offline

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