8w7 lasted 2 weeks..

[big_mofo 10+ year member]

oh .. crap.i just had my friend tune it today. and it sounded alot better with the gain up.

is there another way i can set my amp so it soudns as good as it was with the gain up?

so its not blown

 

[adas Pro Seller]

bridged a T3002 puts out around 800w rms at 2 ohms. the 8W7 runs at 3 ohms, so it was getting about 550-600w. It should have taken that without much problem, must of just been a clipped signal going to the sub. if your HU was at -15, i don't think thats the best way to have it to set gains with.//content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

 

[Warbleed 10+ year member]

I love the DD kids suggesting a DD speaker for this problem. It's the Indian, not the canoe...

 

[Immacomputer 10+ year member]

you probably sent it a clipped signal. no speaker likes that, no matter how much power.

Umm... it's the extra power from the clipped signal that the speaker may or may not like. It has nothing to do with the waveform itself.

 

[Blunt 10+ year member]

hmm.. i need to research more baout this . it hoguht i had it down.and it actually sounded alot bette riwth the gain up than when it was down. it was louder and it was alot warmer and handled more of the frequencies that way. when the gain was down, i had to always ajust the Hz on the bass control for each song to get the full sound of the bumps.

leave the bass knob alone

 

[iagrdshaka 5,000+ posts]

i bought a 8w7 from a guy that ran a 250 watt amp mono.i ran a 300 watt bridged amp on it.

the 8w7 blew in 2 weeks.

do you guys know what i did wrong? //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif

I doubt you blew it by over powering, so we could throw out clipping. I'm basing this mainly because I have seen an 8" W7 take 1000 watts in a daily driver.

What enclosure was it in? Also was it in good shape or well used when you got it?

 

[Prowler573 5,000+ posts]

I doubt you blew it by over powering, so we could throw out clipping.

Clipped signals and overpowering do not necessarily have anything to do with one another //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif

 

[iagrdshaka 5,000+ posts]

Clipped signals and overpowering do not necessarily have anything to do with one another //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif

//content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif But a clipped signal (square wave) has a RMS voltage 1.414 times that of a pure sine wave...

 

[bass_lover1 10+ year member]

Since you said you have the sub out at -15 on your HU, and you set the gain rather high, you probably did send a clipped signal to the w7. W7s can take power, but not many drivers enjoy a clipped signal.

Next time, turn the sub out up, and the gain down. Higher input voltage from the HU means a lower gain, which usually means a cleaner non-clipped signal.

 

[Frijoles24 10+ year member]

thanks everybody.

my friend had adjusted the amp with gain up and hu -15. tahts how he has his setup. well i guess i cant do much about it now. but ive learned something =D

how does the sub sound when its clipping.

anybdoy know what setting i shoudl use to have thefull range frequency like i did when i ahd the gain up ?

 

[Prowler573 5,000+ posts]

//content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif But a clipped signal (square wave) has a RMS voltage 1.414 times that of a pure sine wave...

(This example is for illustrative purposes only //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif)

He could have been (not saying he was - example only, remember) been using an amp that only makes 200w RMS.

Said amp could have been not providing near enough wattage for the driver it was powering so, like so many other novices to the hobby that we either know, have heard about, or read about in a setting such as this, cranked the gains trying to get more volume from something that simply wasn't up to the task of providing it, and clipped the crap out of the amplified signal.

Said clipped signal could very easily do damage to the driver that was receiving it....but had nothing to do with exceeding the mechanical limits of the sub.

 

[psych0ticnemes1 5,000+ posts]

Umm... it's the extra power from the clipped signal that the speaker may or may not like. It has nothing to do with the waveform itself.

You can blow a speaker without ever exceeding its mechanical limits... yes the wave can hurt a sub...

 

[newusername 10+ year member]

The only way to damage a speaker is to overpower it (whether that is thermally or mechanically); clipped signals have a lower crest factor than a sine wave so there is more power under the curve. A clipped signal alone will not damage a speaker at all; the only damage can occur from sending more power than the speaker is able to dissipate, which can be achieved from music, sine, or square waves.

Clipping is bad for achieving the most accurate reproduction of the input signal, but it not necessarily damaging.

 

[luvinthebass 5,000+ posts]

thanks everybody. my friend had adjusted the amp with gain up and hu -15. tahts how he has his setup. well i guess i cant do much about it now. but ive learned something =D

how does the sub sound when its clipping.

anybdoy know what setting i shoudl use to have thefull range frequency like i did when i ahd the gain up ?

if you can put it on 0 do it, -15 is hella low, if you put it on 0 or flat your gain will prolly be maybe halfway instead of all the way, **** your friends setup and make it the way YOU want, you prolly won't clip the amp that way and your next sub will last longer hopefully.

 

[psych0ticnemes1 5,000+ posts]

The only way to damage a speaker is to overpower it (whether that is thermally or mechanically); clipped signals have a lower crest factor than a sine wave so there is more power under the curve. A clipped signal alone will not damage a speaker at all; the only damage can occur from sending more power than the speaker is able to dissipate, which can be achieved from music, sine, or square waves.
Clipping is bad for achieving the most accurate reproduction of the input signal, but it not necessarily damaging.

If this is true then everything i have read is wrong. I was under the impression that a clipped wave can cause a speaker to fail simply because the coil cannot handle the distorted wave. Cudos for a good explanation.