RSd500.4 Question

Phoenixcolt · Post by **Phoenixcolt** » Tue Jan 30, 2007 1:48 pm

Does this amp have the capability to bandpass like the Ti did. Can you run a 3 way setup like the Ti enabled us to do between the front and rear channels?

Phoenixcolt · Post by **Phoenixcolt** » Tue Jan 30, 2007 2:58 pm

NEVER MIND, I found a pic online. It can be bandpassed.

Post by **VW337** » Tue Jan 30, 2007 4:17 pm

Bypass yes, bandpass no.

Phoenixcolt · Post by **Phoenixcolt** » Tue Jan 30, 2007 7:14 pm

Shitty...I was so happy when I thought BP stood for bandpass...damnit...I am considering a 3 way setup but I can't use an RSd500.4 the way I want to set it up...minimal amps...thanks for clearing that up before I went out and wasted money on one : ).

Phoenixcolt · Post by **Phoenixcolt** » Thu Apr 26, 2007 12:11 am

Since I'm going active, should I adjust the gains using a DMM for my 500.4 to the CEA wattage? The 78 watts per channel?

The tweets I am only going to adjust to 10 watts but was wondering if everyone thought 78 was a proper figure for the amp. Thanks.

Post by **VW337** » Thu Apr 26, 2007 8:53 am

You should have no problem exceeding the CEA rating.

Phoenixcolt · Post by **Phoenixcolt** » Thu Apr 26, 2007 9:51 am

VW337 wrote:You should have no problem exceeding the CEA rating.

But what wattage should I use to adjust the gains with a dmm in the root(watts*ohms) equation?

Post by **VW337** » Thu Apr 26, 2007 11:17 am

use the wattage that your speakers are rated for.

Phoenixcolt · Post by **Phoenixcolt** » Thu Apr 26, 2007 11:36 am

120 watts?

Is it always supposed to be what the speaker is rated for? I thought it was supposed to be what the amp is putting out for wattage?

Post by **VW337** » Thu Apr 26, 2007 4:56 pm

If the amp puts out more power than the speaker then adjust for the speaker, but if the speaker will handle what the amp can produce then adjust for the amp. However in this case you should be able to match the amp to the speakers power requirement even though the amp is not quoted to do so.

Keep in mind CEA rating is pushing things a bit more than the numbers you are used to seeing therefore the numbers will be smaller but the ability is still there.

Once you adjust the amp verify the amp outputs to make certain you are not clipping anything, you can do this by setting your meter to DC voltage and seeing what type voltage registers, essentially you want very little or none. The draw back is this is not the best way to check for clipping but it will give you an idea if you are.

Phoenixcolt · Post by **Phoenixcolt** » Thu Apr 26, 2007 9:19 pm

VW337 wrote:If the amp puts out more power than the speaker then adjust for the speaker, but if the speaker will handle what the amp can produce then adjust for the amp. However in this case you should be able to match the amp to the speakers power requirement even though the amp is not quoted to do so.

Keep in mind CEA rating is pushing things a bit more than the numbers you are used to seeing therefore the numbers will be smaller but the ability is still there.

Once you adjust the amp verify the amp outputs to make certain you are not clipping anything, you can do this by setting your meter to DC voltage and seeing what type voltage registers, essentially you want very little or none. The draw back is this is not the best way to check for clipping but it will give you an idea if you are.

The clipping test you described enlightening, I was not aware of it so I am happy to know now that I can test this.

eyesofra · Post by **eyesofra** » Fri Apr 27, 2007 6:17 am

of course......!!!
when the output signal clips , it results in DC due to the clipped peaks...
didnt cross my mind at all...

gettin to the car right a way,always wanted to know what's the max output of my oct-r 15.0.1 before clipping......

thanks for another useful tip errin....

Phoenixcolt · Post by **Phoenixcolt** » Fri Apr 27, 2007 12:40 pm

Well how about this....

I was adjusting my gain, with the dmm gain equation the figure to set would have been about 21.5 volts ac for the mids. I couldn't get it past like 18-19volts and that was with the gain all the way and I wasn't gonna leave it that way so I settled on 15-16volts ac, the gain is turned about 3/4 the way up for 15-16 and there is no distortion that I could hear.

Did I mess something up?

Post by **stipud** » Fri Apr 27, 2007 1:10 pm

16 volts has you at about 65w @ 4 ohms... Are you using a 60Hz test tone?

Post by **VW337** » Fri Apr 27, 2007 1:19 pm

.........and are you adjusting you're HU to 3/4 volume with all XO's and faders, etc.... zeroed?

Phoenixcolt · Post by **Phoenixcolt** » Fri Apr 27, 2007 9:51 pm

I realized after I already posted that I should use the 60 HZ test tone, my 16 volts was just with music

.