Hey, I have 2 aftermarket speakers that can handle up to 90w RMS, and have a 4 channel amp that puts out 75w RMS per ch (only using 2 ch though).
My front speakers sound good, but since my HU has an int amp that puts out 50w, could my speakers sound just as good without the amp?
I could sell it and it will take up a lot less room in my truck with only my sub amp in it.
I'm asking this cause my friend's doing that and his speakers sound great (his HU puts out 50 or 55w).
My subs are runnung at 250w RMS each so I don't think they'll drowd out the front speakers without the amp (to the front speakers).
I can always adjust the volume to a setting that's loud enough for the front speakers, then adjust my gain for the subs accordingly.
What do you guys think?
Replies (10)
erikcooper on 01/7/2004 19:01:02
You have some part numbers. It will be alot easier to tell you what you need to know if you do. The HU is not very likely to be putting out that many watts, yes it can do it max, but not continuous. More than likely it would push them but give me the part numbers and I can tell you roughly how many watts each one is getting and what it would be without them.
uochronos on 01/7/2004 19:04:33
an amp is not nessicary as long as the speakers dont start sounding distorted... your HU is likly 50watts max more likly 20watts RMS(continuous power) i have a set of component speakers that handle 125watts rms but i run them off my head unit and they sound fine... i well be getting an amp but its not necessary for them just give them the ability to use there full potential... the speakers do have to work harder though when you under power them.
alanjlamore on 01/7/2004 19:10:40
Oh, I didn't think of that, but that would make sense since most companies like to display the total watts instead of RMS.
The HU is an alpine cda7892. I just looked up the specs and I think it only has 21w RMS.
4X50 max, 4X21 RMS.
I got this info from searching on ebay.
Is there a way to make the four channels into 2 from the HU to increase the wattage, since I'm only using front speakers?.
I also made a mistake on the speakers cause I forgot that I blew the 90w RMS speakers that I had and replaced them with sony xplod 5 1/4" that were in the back of my truck which handle only 50w RMS.
Thanks for the replies!
cplkittle on 01/7/2004 19:56:05
if the amp is bridgeable, you could run the right channel off the front output - bridged, and the rear channel could become the left - bridged
alanjlamore on 01/7/2004 20:03:35
Say if I hooked up the front output (of the HU) bridged to my right speaker, and my rear output bridged to my left speaker, would I hook them up this way?:
Connect front right positive output to the speaker positive, front right negative to front left positive, then the front left negative to the speaker negative?
Then the same for the rear outputs going to the other speaker?
I know this sounds confusing, but I just don't know exactly how to bridge the amp, especially since the amp is in the HU.
alanjlamore on 01/7/2004 20:12:06
Or would it be:
front pos output to right positive speaker, then rear neg to right neg speaker?
And rear pos to left speaker pos, then front neg to left speaker neg?
I think the way I had it in the above post is more correct, but I'm not sure.
cplkittle on 01/7/2004 20:14:40
ok, I misunderstood, I thought you were talking about a seperate amp. I don't know if you can bridge a HU, wouldn't recommend that.
You can isolate all the power to your fronts by using the fader, but that isn't going to give you much more power to them. In this case, an external amp is probably going to be needed.
cplkittle on 01/7/2004 20:19:21
I got the posts mixed up.. you did say in another post that you had a sony 4ch amp. This is the one that you can bridge into two channels that I was referring to.
alanjlamore on 01/7/2004 20:29:18
Oh, yes that's the one that puts out 75w RMS per channel and my speakers are rated to take 50 RMS, so I was thinking that I didn't need it cause I thought the HU put out 50 RMS, but it only puts out 21 RMS (50 max) and then I was hoping to bridge the internal HU amp.
I hope you followed that, talk about a run on sentance :)
This would probably ruin the HU right?
I was thinking that I'm wasting space in my truck and didn't need all four channels since each channel gives 75w and my speakers are only rated at 50.
I was also surprised at the clearity and loudness of my friends 6x9s that were running off of the deck only.
ttocs on 01/7/2004 21:16:50
you cannot bridge a deck, they are not designed for it. hook the 4 channel amp up to all the speakers. If you adj the gain on the amp properly, you will have no problems. A speaker can handle a bigger amp if it is played correctly. Back in the day when I started I had stock speakers wired to a 4 channel amp for years when I was broke in high school...
The 6 x 9's will really come alive with a good amp..........
My front speakers sound good, but since my HU has an int amp that puts out 50w, could my speakers sound just as good without the amp?
I could sell it and it will take up a lot less room in my truck with only my sub amp in it.
I'm asking this cause my friend's doing that and his speakers sound great (his HU puts out 50 or 55w).
My subs are runnung at 250w RMS each so I don't think they'll drowd out the front speakers without the amp (to the front speakers).
I can always adjust the volume to a setting that's loud enough for the front speakers, then adjust my gain for the subs accordingly.
What do you guys think?
Replies (10)
erikcooper on 01/7/2004 19:01:02
You have some part numbers. It will be alot easier to tell you what you need to know if you do. The HU is not very likely to be putting out that many watts, yes it can do it max, but not continuous. More than likely it would push them but give me the part numbers and I can tell you roughly how many watts each one is getting and what it would be without them.
uochronos on 01/7/2004 19:04:33
an amp is not nessicary as long as the speakers dont start sounding distorted... your HU is likly 50watts max more likly 20watts RMS(continuous power) i have a set of component speakers that handle 125watts rms but i run them off my head unit and they sound fine... i well be getting an amp but its not necessary for them just give them the ability to use there full potential... the speakers do have to work harder though when you under power them.
alanjlamore on 01/7/2004 19:10:40
Oh, I didn't think of that, but that would make sense since most companies like to display the total watts instead of RMS.
The HU is an alpine cda7892. I just looked up the specs and I think it only has 21w RMS.
4X50 max, 4X21 RMS.
I got this info from searching on ebay.
Is there a way to make the four channels into 2 from the HU to increase the wattage, since I'm only using front speakers?.
I also made a mistake on the speakers cause I forgot that I blew the 90w RMS speakers that I had and replaced them with sony xplod 5 1/4" that were in the back of my truck which handle only 50w RMS.
Thanks for the replies!
cplkittle on 01/7/2004 19:56:05
if the amp is bridgeable, you could run the right channel off the front output - bridged, and the rear channel could become the left - bridged
alanjlamore on 01/7/2004 20:03:35
Say if I hooked up the front output (of the HU) bridged to my right speaker, and my rear output bridged to my left speaker, would I hook them up this way?:
Connect front right positive output to the speaker positive, front right negative to front left positive, then the front left negative to the speaker negative?
Then the same for the rear outputs going to the other speaker?
I know this sounds confusing, but I just don't know exactly how to bridge the amp, especially since the amp is in the HU.
alanjlamore on 01/7/2004 20:12:06
Or would it be:
front pos output to right positive speaker, then rear neg to right neg speaker?
And rear pos to left speaker pos, then front neg to left speaker neg?
I think the way I had it in the above post is more correct, but I'm not sure.
cplkittle on 01/7/2004 20:14:40
ok, I misunderstood, I thought you were talking about a seperate amp. I don't know if you can bridge a HU, wouldn't recommend that.
You can isolate all the power to your fronts by using the fader, but that isn't going to give you much more power to them. In this case, an external amp is probably going to be needed.
cplkittle on 01/7/2004 20:19:21
I got the posts mixed up.. you did say in another post that you had a sony 4ch amp. This is the one that you can bridge into two channels that I was referring to.
alanjlamore on 01/7/2004 20:29:18
Oh, yes that's the one that puts out 75w RMS per channel and my speakers are rated to take 50 RMS, so I was thinking that I didn't need it cause I thought the HU put out 50 RMS, but it only puts out 21 RMS (50 max) and then I was hoping to bridge the internal HU amp.
I hope you followed that, talk about a run on sentance :)
This would probably ruin the HU right?
I was thinking that I'm wasting space in my truck and didn't need all four channels since each channel gives 75w and my speakers are only rated at 50.
I was also surprised at the clearity and loudness of my friends 6x9s that were running off of the deck only.
ttocs on 01/7/2004 21:16:50
you cannot bridge a deck, they are not designed for it. hook the 4 channel amp up to all the speakers. If you adj the gain on the amp properly, you will have no problems. A speaker can handle a bigger amp if it is played correctly. Back in the day when I started I had stock speakers wired to a 4 channel amp for years when I was broke in high school...
The 6 x 9's will really come alive with a good amp..........
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