On a 2 channel amp that I plan on bridging, do I need BOTH rca ins? - Page 4

FyreDaug · 10-13-2006, 04:46 PM

Yeah I know and the advice thats been given in this thread is making me think its gonna work better the way it was before, but since weve managed to get to post 46 now, I think im just gonna try to get results. Not using full potential of the amp? Your right, if im using 80w2, full potential is 4ohm bridged, how its going to sound will be decided later, but another thing I thought of is because its more likely to distort on bridged mode, if im only giving it 1 input it wont have to mix anything, itll just be 1 channel going in. Its STILL going to give me the full 220wx1 though, regardless of inputs. Its going to be quieter like you said, but I think this system is going to be loud as it is. I know im arguing for a potential lost cause here, but there is still a ~25% chance that it will sound good, if not better than 80w2, because its essentially 220w2 this way... we'll wait and see I suppose. Itll take <5mins to wire it up the way you are suggesting anyways, and if I do it the "normal" way, I can ditch an amp.

edit: I got these 2 amps for 100 bucks, when they are regular 150+ here EACH, I couldnt pass it up so I figured Id work with it

ZtH01 · 10-13-2006, 08:49 PM

Quote: Originally Posted by FyreDaug

Yeah I know and the advice thats been given in this thread is making me think its gonna work better the way it was before, but since weve managed to get to post 46 now, I think im just gonna try to get results. Not using full potential of the amp? Your right, if im using 80w2, full potential is 4ohm bridged, how its going to sound will be decided later, but another thing I thought of is because its more likely to distort on bridged mode, if im only giving it 1 input it wont have to mix anything, itll just be 1 channel going in. Its STILL going to give me the full 220wx1 though, regardless of inputs. Its going to be quieter like you said, but I think this system is going to be loud as it is. I know im arguing for a potential lost cause here, but there is still a ~25% chance that it will sound good, if not better than 80w2, because its essentially 220w2 this way... we'll wait and see I suppose. Itll take <5mins to wire it up the way you are suggesting anyways, and if I do it the "normal" way, I can ditch an amp.

edit: I got these 2 amps for 100 bucks, when they are regular 150+ here EACH, I couldnt pass it up so I figured Id work with it

No, It'll be more like a 1/4 of 220W. Or, 50-60watts. That is, if you're still set on using one input...

Anyways, I guess your set on doing it that way, which is fine, it's your stuff...
My question to you is: Why bother asking anyways, when you have your mind made to use the amp the way it's not meant to be used?

FyreDaug · 10-13-2006, 10:47 PM

Quote: Originally Posted by ZtH01

No, It'll be more like a 1/4 of 220W. Or, 50-60watts. That is, if you're still set on using one input...

Anyways, I guess your set on doing it that way, which is fine, it's your stuff...
My question to you is: Why bother asking anyways, when you have your mind made to use the amp the way it's not meant to be used?

I asked because I wanted to know if you NEEDED them, and then I posted what I was trying to do. I thought you read that, and asked again, then I re-explained and you read it again.

How would it be 1/4 of 220w, when it runs at 220w when its bridged at 4ohm. The other input is just a signal, if its not getting another signal it wont add it to the merged wave. All it does when you bridge is take the 2 signals, add the waves together and then send it to the speaker. If its only using 1 signal, it will be quieter, but its not gonan cut power. It should have about 5-6vrms from the line driver. Which is more than it was getting from the deck it was hooked up, when it was 2.5v per channel. Adding them together will increasre the chance of it distorting because its adding 2 things together. It will also be a cleaner sound instead of getting left/right and mixxing it.

I dont see how im missing something here, and you dont need to be a dick

ZtH01 · 10-13-2006, 11:14 PM

Quote: Originally Posted by FyreDaug

I asked because I wanted to know if you NEEDED them, and then I posted what I was trying to do. I thought you read that, and asked again, then I re-explained and you read it again.

How would it be 1/4 of 220w, when it runs at 220w when its bridged at 4ohm. The other input is just a signal, if its not getting another signal it wont add it to the merged wave. All it does when you bridge is take the 2 signals, add the waves together and then send it to the speaker. If its only using 1 signal, it will be quieter, but its not gonan cut power. It should have about 5-6vrms from the line driver. Which is more than it was getting from the deck it was hooked up, when it was 2.5v per channel. Adding them together will increasre the chance of it distorting because its adding 2 things together. It will also be a cleaner sound instead of getting left/right and mixxing it.

I dont see how im missing something here, and you dont need to be a dick

I'm not being a dick. I'm being honest. If all other things are equal, the quieter setup has less power. It's that simple. You are not getting the full 220 watts from the amp, if you only have one input hooked up. I have my Rockford Fosgate P4002 bridged. Birthsheet says it does 175x2 at 4 ohms. This is about 700 watts or so @ 4ohm mono. When I unplug an RCA and it gets quieter, it is no longer putting out 700 watts. I reckon it drops it 25%. Maybe only 50%, but it gets very quiet.

The second input is not just added to the wave. If properly bridged, the other channel is actually 180 degrees out of phase. This channel becomes the new ground, or negative output. This allows twice the voltage to swing, or 4 times the power output, assuming the amps power supply isn't crap.

FyreDaug · 10-13-2006, 11:20 PM

So with the way im planning on setting it up, you are saying that it would be better to split the 1 input into 2, to make it equal? Itll have 1/2 the input voltage, but then x2. So its still the same amount, just split. Thats better?

Im curious

XC-C30 · 10-13-2006, 11:47 PM

*sigh* just do as you please.... are you even listening to what ZtH01 or shadow are saying? so me aswell as ZtH01 are dicks, just because we don't tell you what you wanna hear? go bother someone else....

FyreDaug · 10-13-2006, 11:52 PM

What the hell, where did you get that from? He was being condescending and had an attitude. Have you even read through the thread? The question im asking is if its better to split the 1 input into 2 so it has both of them at half voltage rather than 1 with 100% line voltage

ZtH01 · 10-14-2006, 01:09 AM

Quote: Originally Posted by FyreDaug

So with the way im planning on setting it up, you are saying that it would be better to split the 1 input into 2, to make it equal? Itll have 1/2 the input voltage, but then x2. So its still the same amount, just split. Thats better?

Im curious

All I'm saying is that these amps are designed to work two ways. Stereo, or bridged mono. Either way both inputs are supposed to be used. That's just the way it is. Again, I don't care how you run it. But if it were my setup, I'd rather have one amp then 2, if output levels will be similar, and distortion levels will be the same or less.

I guess all I can say is try it out. I have, and the bass dies when I do it.

XC-C30 · 10-14-2006, 01:57 AM

Quote: Originally Posted by FyreDaug

What the hell, where did you get that from? He was being condescending and had an attitude. Have you even read through the thread? The question im asking is if its better to split the 1 input into 2 so it has both of them at half voltage rather than 1 with 100% line voltage

I've read the thread from the start, as a matter of fact, I was the first one who answered you, so yes, I've read the thread. first you called me a dick (which you appologised for, so that's fine) then you're not listening to far more experienced guys then you are. then you just go on about putting in just one RCA, like you firs intended. then you say you're asking info on it, but still in the end are going with one RCA against opposite advise. and then you're calling someone else a dick, just becayse he sais something different than you want to hear. (he just gave some info, don't see the being a dick-part in that)....

but hey, like I aswell as ZtH01 said, do as you please, it's not our install, so we could care less! we're only trying to help you out by putting things straight where you missed out. so I wonder if YOU've read your own thread well enough...

but hey, gonna shut up about it, i don't give a **** anymore!

XC-C30 · 10-14-2006, 02:16 AM

you opened up this thread 4 days ago..... how long does it take for you to just test if you need one or both?.....

FyreDaug · 10-14-2006, 04:54 AM

Far more experienced? I think you give yourself too much credit. I cant test it out right now, I dont have even the computer built. But I do my research first. I have the hardware and stuff because I already had it. You're "putting things straight" without providing any proof or evidence, I have a valid point opposing your point and you just keep saying the same thing and avoiding it. This thread was asking if I NEED it. It was a thread to figure that out. We did, a while ago apparantly, but then we went a little more indepth and I asked the amazing question "why" but since then I havent gotten a real reply about why, no evidence and you seem to think you are better than everyone else. I give credit where credit is due, but this thread went a little more off topic since then, and now the question was how the amp takes the voltage input on either channel if its in bridged mode, and we have determined that it would be "better" if both were in, with half voltage, instead of 1 with full voltage, but again, the question "why" came up and it keeps getting avoided and I keep getting asked why I had to ask. What the **** who cares

XC-C30 · 10-14-2006, 05:33 AM

Quote: Originally Posted by FyreDaug

Far more experienced? I think you give yourself too much credit. I cant test it out right now, I dont have even the computer built. But I do my research first. I have the hardware and stuff because I already had it. You're "putting things straight" without providing any proof or evidence, I have a valid point opposing your point and you just keep saying the same thing and avoiding it. This thread was asking if I NEED it. It was a thread to figure that out. We did, a while ago apparantly, but then we went a little more indepth and I asked the amazing question "why" but since then I havent gotten a real reply about why, no evidence and you seem to think you are better than everyone else. I give credit where credit is due, but this thread went a little more off topic since then, and now the question was how the amp takes the voltage input on either channel if its in bridged mode, and we have determined that it would be "better" if both were in, with half voltage, instead of 1 with full voltage, but again, the question "why" came up and it keeps getting avoided and I keep getting asked why I had to ask. What the **** who cares

ahum, did I say I was more experienced? No i didn't. I said you wheren't listening to more experiënced people, did I mention myself? No i didn't.... some amps use a single RCA, others use both... is it so hard to

*******!!!! (and no, I don't care if i get banned for this)

Killa200 · 10-14-2006, 05:51 AM

i mentioned a bit back (i think it was all covered up in the beheading) that that amp will go quiet (aka lose part of the signal) if its not fed through both rca's, as ive worked in the amp your questioning. Now technically you should be able to use a y splitter, as the low level singal doesn't work in retrospect like a speaker does, as the amp is really sniffing for a singal instead of "feeding" off it, and splitting it should still yeild the same results as a stereo link, just in mono persay (since it is one channel of the stereo link now that it is split). All the amp is doing like was said above is putting the rca's slightly out of phase to make the singal stronger, and since the rca can handle more than one amp in the first place (again, in my exp, but its alot more varied, it all depends on equip), y splitters "should work".

Best way to find out though? Go try it, worst that can happen is you hate it and try a diff method.

ZtH01 · 10-14-2006, 10:47 AM

Quote: Originally Posted by FyreDaug

Far more experienced? I think you give yourself too much credit. I cant test it out right now, I dont have even the computer built. But I do my research first. I have the hardware and stuff because I already had it. You're "putting things straight" without providing any proof or evidence, I have a valid point opposing your point and you just keep saying the same thing and avoiding it. This thread was asking if I NEED it. It was a thread to figure that out. We did, a while ago apparantly, but then we went a little more indepth and I asked the amazing question "why" but since then I havent gotten a real reply about why, no evidence and you seem to think you are better than everyone else. I give credit where credit is due, but this thread went a little more off topic since then, and now the question was how the amp takes the voltage input on either channel if its in bridged mode, and we have determined that it would be "better" if both were in, with half voltage, instead of 1 with full voltage, but again, the question "why" came up and it keeps getting avoided and I keep getting asked why I had to ask. What the **** who cares

Have you ever installed an amp? If you havent, anyone who has installed one has more experience then you... You want to know why it's better to run a bridged amp with both inputs? I'll tell you why BECAUSE THAT'S THE WAY THE AMP WAS DESIGNED.

Go have this discussion with the guys at Scosche if you don't believe any of us.

FyreDaug · 10-14-2006, 02:26 PM

Quote: Originally Posted by Killa200

i mentioned a bit back (i think it was all covered up in the beheading) that that amp will go quiet (aka lose part of the signal) if its not fed through both rca's, as ive worked in the amp your questioning. Now technically you should be able to use a y splitter, as the low level singal doesn't work in retrospect like a speaker does, as the amp is really sniffing for a singal instead of "feeding" off it, and splitting it should still yeild the same results as a stereo link, just in mono persay (since it is one channel of the stereo link now that it is split). All the amp is doing like was said above is putting the rca's slightly out of phase to make the singal stronger, and since the rca can handle more than one amp in the first place (again, in my exp, but its alot more varied, it all depends on equip), y splitters "should work".

Best way to find out though? Go try it, worst that can happen is you hate it and try a diff method.

Only response worth replying to, thanks killa