Need help with Alpine Replica V12 Amp

[wilcwo2003]

I have a Alpine Replica V12 Amp 4ch and 4 component speakers (2 rear + 2 front) + 1 pair of tweeters (rear)

I am wondering if the v12 amp can be bridged for a 10-12" woofer. I knoe the v12 is not powerful enuff for woofers, but I just want minimal bass effect and not those BOOM BOOM BOOM type of bass.

Can anyone help?

 

[oldskolboyz]

what your ride

 

[kyheng]

I have this amp also, but frankly speaking, it can use for powering coaxial or component set only, as it output is 85w rms at 4ohm. You must know this is a replica amp, not real amp, so maybe the power is less than actual it stated..

 

[wilcwo2003]

oldskolboyz,
am using a perdana v6

kyheng,
so far sound wise not bad la .. since ur using it, you realise that there isn't any or much bass. practically i can barely hear them and some music that has bass in it plays terribly on this amp.

as for the power of the amp, i could not say much as i don't think we would know the actual rms power, but if its really 85 rms than if you bridge the two ch together should be able to get 150-160RMS???? I'm not sure la .. just guessing

Anyway .. thanks and anyone who can give help would very much appreciate it.

thanks!

 

[wilcwo2003]

kyheng, oh yea forgot to mention i have a friend using the original v12 amp. he also said the same thing "for powering component and coaxial sets" and not for bass, however he did not try bridging it la ..

 

[kyheng]

Nolah, I use the amp to power my RF FNX2614 comp set, the bass is nice, futhermore is put on rear, not on front door, if put on front door it should give me better bass.. But this will not happen to me, as I don't want to make a hole on my front door, I don't trust accessories shop's workmanship. When do that time say you will not have lose screw sound problem, after I encounter this problem, they say your car is old already, sure have this problem..
Anyway don't even try to use it for sub if you can bridge it, as I use it to power my 4" and 6.5" also become warm, temp around 45'C, if use for sub it will go higher...

 

[Zenn]

sure u can bridge it as long as it is at 4ohm, so look for a 4ohm single voice coil sub, also since the power isnt that high, look for a low rms rated sub, thats easier to drive. loose booming type of bass cant be helped as lower end / entry level subs tend to be that way. tight transparent and musical subs are pretty expensive. a well built sealed box and proper tuning would help i guess...
use the other 2 channels for the components in front (mids, passive & tweets).

 

[howiechoo]

erm..i tried b4 bridge it for a 150rms 12" sub...work..and quite nice

 

[bryan90s]

i tried b4 for a week then returned it.

frankly is not suitable for woofer even when u bridge it all to mono. it cant feed my twin 6.5" subwoofer in bandpass enclosure.sound lembik.

 

[kyheng]

Yarloh, said before already, with 2 front speaker and 2 rear speaker it also can become warm, if sub means sure it can use to fry an egg...
Anyway I use a 2 channel amp (other brand)bridged for sub to test, with the same amp, speakers will be warm only but sub, put water it boils off instantly.

 

[wilcwo2003]

well .. all i want is some bass and not those BOOM BOOM sound ... besides too much bass spoilt the music and not good for the ears and heart .. later get heart attack when driving :p

 

[oldskolboyz]

So U just need basic system set-up loorr... just add 1pc 8'mid woofer or subwoofer at the center your rear speaker board.. rear speaker connect direct from HU... V12 power front speaker & 8' mid/sub..

 

[Kippo]

well .. all i want is some bass and not those BOOM BOOM sound ... besides too much bass spoilt the music and not good for the ears and heart .. later get heart attack when driving :p

boom boom is how good is your sub+box combo.
Read the amp manual and see if it can be bridged. If can, hantam la pasang 1 wufer.

 

[83cat]

hey, i also have one, it really can't play any base la, no omp, ofcause you can push 12" or 10" also got sound but no that kind of tum tum..

 

[Kippo]

seems that some of you are not clear on the items that affects the sub.

1. Amp. output power: It has no bearing on the frequency response of the sub. A sub that move 5mm with 200W & move 10mm with 600W will have the same freq. response. The difference is only the loudness of the sub. So if you have a problem with how not loud your sub is, go for more power that the sub allows. If you change the sub then the freq. response will differ. You cannot make a direct comparison la.

2. Box design : ported/vented, sealed, bandpass (4th./6th./many2 order), hybrid design etc. will affect how the sub will sound. If you do not like how your sub souds then go re-design your box. Which response you want? More on upper end (80~150hz) or lower end (30~50hz)? This will affect how you design your box.
If you like *thump*thump* kind of bass then you need to go for higher Qtc (>1) for sealed box or port tuning higher eg.50hz for ported/vented box. If you like more low end extension i.e rumbling bass (your car vibrates but you don't feel anything) then go for lower Qtc (0.85>) for sealed box or port tuning at eg.30hz for ported box.
So what you like? it will depend on your music taste. Rock & techno (kampai kind of style) will be more on upper end. If you like hip-hop, trance, classical etc. then go for lower end.
A good way to see if you like a particular sub response, go build a ported box but with the round port installed outside the box. Then vary the port tuning by shortening or extending the port length. I recommend to use PVC pipe (3" or 4" so minimise port noise). Once you like the sub response, (this for experience user only) go and measure the port lenght and calculate the port tuning. Use simulation software eg. WinISD or LEAP (if u're rich) and plot the freq. response graph by putting in the net box vol., port length&diameter (port tuning). Now if you want to use sealed box then plot a sealed box response curve and vary the box volume until you get almost similar curve as the response that you like. That will be your base for more fine tuning.

i'll stop here.

 

[bububann]

Excellent stuff Kippo!

Now that's what I call information!

Cheers brothers!

 

[kyheng]

Indeed is good information, only tilted away abit as this theard is talking about the amp, not the sub. Anyway this amp actual power is less than 85watt rms per channel, maybe around 50-70w rms. I found out this when I change this amp to my Lightning Audio 4 channel amp. Same speaker and HU same sttings but come out volume too loud.
This replica amp the best only can pump a sub which only have 100watt rms, more than that it will not take it and cause it to overheated and go to potect mode. This is the mistake that all of us will make: use an lower end amp to pump a sub that needs higher power than amp. WQhen on not enough bass, so turn the amp higher volume, end up overheated. If the amp can take it then is not an issue. Some might cause some parts to burn..
Talking about woofer enclosure, not bigger box is better, it might spoilt the woofer as well if too big. Details can be check on below thread :
http://www.zerotohundred.com/newforums/showthread.php?t=72205
Anyway don't know how true is the statement, but if from Rockford I assume is true on this.

 

[Zenn]

use a subsonic filter for that...

 

[Kippo]

you can power a sub with small amount of power by making the sub more effiecient i.e using bigger enclosure. The disadvantage of going this way will be the sub will lack on the upper end but have more on the lower end. Some ppl may call it too soft and lacks punch. To increase the efficiency again, we can go for ported box. By playing around on port tuning, it may help in getting the response that you want.

IMHO 150W to the sub is plenty loud already.

On damaging the sub in bigger enclosure, you will need to look at excursion vs. power curve (use winisd). If you get over-excursion, then you may need to lower the box vol. or if the over-excursion is only at the lower end then you need to set the infrasonic filter (subsonic) to cut the freq. where the sub will over-excurt.

 

[ahchun]

i got one of this amp also. i am very satisfied with what this amp can do for the price i pay. always compare with the price u pay vs quality u will get. i drive kenari and using kicker compset rated at 60rms and one 8 inch tube woofer dynaquest (chicken brand what most ppl will call it) but i got enough bass out from this amp. maybe my expectation is not high as i am setting it up for fun only. not to go till very high stage of ICE.