Mono Block Amp Question
11-04-2007, 10:11 AM
#11
I looked at your subs. They appear to be dual 4 ohmers. So if you want to run these two subs, you cannot get a monoblock. These subs will give you 4 ohm load when bridged, and not many monoblocks give you a lot of power at that load. If you already have the subs, and set on using them, then you may consider getting a 2-channel amp, and run them in stereo at 2 ohm load. You must be kinda new to this ohm stuff 
If you still want to use a monoblock, you may want to get the subs in dual 2 ohm configuration.
If you still want to use a monoblock, you may want to get the subs in dual 2 ohm configuration.
11-04-2007, 12:40 PM
#13
50 Watt CAFz'r
Thread Starter
Join Date: Aug 2007
Posts: 54
How hard is it on the alternator? I've already looked into getting my stock one beefed up but i cant find any one in town to do it for me. Will havening the BIG 3 done put less of a strain on the alternator if I run at 1ohm? One more thing, is it possible to wire these subs up together at 2ohm?
Last edited by matt_s; 11-04-2007 at 12:44 PM.
11-04-2007, 05:15 PM
#14
I've been doing it for...well at least 3years now, no issues to date, very clean and tight bass, no alternator problems, no battery problems. I'm in my car at least 4-5 hours a day, but I don't listen to my system at ear bleeding levels, though loud enough to shake the mirrors regularly. As far as SQ goes, the bass is as clean and tight as when I ran my previous system at 4ohms...so no issues there either. Anyway, that is an option for you to consider.
11-04-2007, 05:42 PM
#15
LOL sasha wtf u talking about.
u can run an amp at 1 ohm just as well as at 2 ohm, 3 ohm, 15 ohm or 75 ohm. the load doesnt matter. a 2 ohm amp that does 1000 watts is worse on your alternator, etc, etc whatever else u said than a 1 ohm 500 watt amp. the draw is what matters, not impedance.
if your subs are dual 4 ohm just get a 1 ohm stable class D amp. all u need is some sort of a 600 watt, 1 ohm stable amp. with the most hurting electrical system it probably wont be too bad, 600 watts is not nearly enough to do any sort of damage to anything. your system probably wont be loud tho, not enough power.
u can run an amp at 1 ohm just as well as at 2 ohm, 3 ohm, 15 ohm or 75 ohm. the load doesnt matter. a 2 ohm amp that does 1000 watts is worse on your alternator, etc, etc whatever else u said than a 1 ohm 500 watt amp. the draw is what matters, not impedance.
if your subs are dual 4 ohm just get a 1 ohm stable class D amp. all u need is some sort of a 600 watt, 1 ohm stable amp. with the most hurting electrical system it probably wont be too bad, 600 watts is not nearly enough to do any sort of damage to anything. your system probably wont be loud tho, not enough power.
11-04-2007, 05:56 PM
#16
Totally with Yuli on this, 1000watts is 1000watts weather its at 1 ohm or 4 ohm it still draws aprox 100amps give or take either way. Look for a 500-600Wrms mono block capable of 1ohm final load you will be fine.
11-05-2007, 08:15 AM
#17
So amazed at how people think power is made.......... like it's magic. At the end of the day, everything balances out......... current, voltage, resistance, amperage............. all work together as per the formula. You can't make something from nothing.
I'm with School-i above......... I mean Yuli.
600 watt one ohm stable mono-block. That is what you need.
I'm with School-i above......... I mean Yuli.
600 watt one ohm stable mono-block. That is what you need.
11-05-2007, 01:46 PM
#18
Ok, here is an explanation to what I have suggested. I hope it helps a bit.
I said that cheaper amps dont run as cleanly at 1 ohm, because some of them have very low damping factor. eg 50 at 4 ohms. You try running at 1 ohm and you will get 12.5 damping factor. Bass sounds like garbage for SQ purposes, and I know from experience. Perhaps for SPL purposes you might get higher numbers due to increased distortion, which is highly audible.
Efficiency: Some amp manuals are more detailed than others. Mine says: 850 watts @ 80 amps eff 75%, 1000 watts @ 113 amps eff 68%, 1000 watts @ 132 amps eff 53%. This is just an example. Different amps have different characteristics, but it gives us an idea. The amps running at 1 ohm seem to be hungrier, while being not very efficient about it. Hence more load on an alternator.
This is what I meant. I did not mean to offend anyone, nor did I want to ask for a bashing. I just gave my suggestions. Take it or leave it. This is a forum.
I said that cheaper amps dont run as cleanly at 1 ohm, because some of them have very low damping factor. eg 50 at 4 ohms. You try running at 1 ohm and you will get 12.5 damping factor. Bass sounds like garbage for SQ purposes, and I know from experience. Perhaps for SPL purposes you might get higher numbers due to increased distortion, which is highly audible.
Efficiency: Some amp manuals are more detailed than others. Mine says: 850 watts @ 80 amps eff 75%, 1000 watts @ 113 amps eff 68%, 1000 watts @ 132 amps eff 53%. This is just an example. Different amps have different characteristics, but it gives us an idea. The amps running at 1 ohm seem to be hungrier, while being not very efficient about it. Hence more load on an alternator.
This is what I meant. I did not mean to offend anyone, nor did I want to ask for a bashing. I just gave my suggestions. Take it or leave it. This is a forum.
11-05-2007, 02:01 PM
#19
BTW Matt. Class D monoblock is more efficient, that Class AB. It is true. Not sure, if you care about good sound and just noise. I have yet to hear a Class D amp running a sub, which sounds anywhere close as good as any other Class. Everyone has unique tastes in sound. I, for one, think Class D sounds like crap, but I am very picky about how I like my music. And I am not talking about distortion at higher frequency, which subs should not produce anyways. I am talking about sound characteristics in general.
Getting back to your question Matt. You can run those subs at 1 ohm with a monoblock. Most people would recommend Class D amp. If thats your choice, my only suggestions are:
1. Look for a 1-channel amp with rating of 600-1000 watts rms at 1 ohm.
2. Look for damping factor of minimum 25 at 1 ohm, that means it should say at least 100 damping factor on the spec sheet as they usually list the number for 4 ohms.
3. Go a good brand name amp.
This amp should not set you back a lot.
Getting back to your question Matt. You can run those subs at 1 ohm with a monoblock. Most people would recommend Class D amp. If thats your choice, my only suggestions are:
1. Look for a 1-channel amp with rating of 600-1000 watts rms at 1 ohm.
2. Look for damping factor of minimum 25 at 1 ohm, that means it should say at least 100 damping factor on the spec sheet as they usually list the number for 4 ohms.
3. Go a good brand name amp.
This amp should not set you back a lot.
11-05-2007, 02:31 PM
#20
