For those who use Hifonics amps.

[Swindez95 10+ year member]

I own a Hfonics BX2005D running a pair of Incriminator Audio LI 12"s (new style). Previously I had these wired into 2 ohm each (DC Resistance of about .8 ohms at amp) and with my car running just before it sucked the life out of my alternator I reached 30 volts rms at about 50hz. These measurements were taken with a true RMS meter. At these voltages and not taking into account impedence rise, this is about 1100 watts. Out of curiosity I rewired my subs to 4 ohms each and paralleled them at the amp. DC resistance seen was 3 ohms. After reconfiguring my H/U and listening by ear for pronounced clipping I adjusted my gain to result in an rms output of 60 volts at the amps terminals. Not taking into account impedence rise losses this comes to right at 1200 watts.

Ok this by itself doesn't seem like much but here is the interesting part, at these rms voltages I never seen my voltage at the Amplifier drop below 13.-6-8 volts whereas at 1 ohm, these same wattages my amp would pull the charging system to below 12 volts.

The moral of this story is for those who have Hifonics amplifiers, try not to run anything below two ohms. Its been said before that running an amp at 1 ohm will decrease an amplifiers efficiency. This my friends is your proof. Its a known fact that running higher voltages into greater ohm loads is much more efficient, especially with AC driven motor structures (a speaker is a linear motor). Also the added benefit is the output is much more pronounced and cleaner sounding. Some people would say that the difference in damping factor is not noticeable i for one however believe I have noticed a difference.

Click to read more...

 

[deLeo 10+ year member]

i ran mine at 1ohm and it blew up

edit : bxi 1208

 

[ctt0002 10+ year member]

So what u r saying is that when u were running them at 1 ohm u only saw 1100 watts and when u ran 3 ohms u saw 1200 watts?

 

[Xprime4 10+ year member]

I run mine at 1ohm and it doesn't even get warm. Stock alt, 700cca amp battery and it never goes under 12v at full tilt. (bxi1606d)

 

[captaincheesey 10+ year member]

I own a Hfonics BX2005D running a pair of Incriminator Audio LI 12"s (new style). Previously I had these wired into 1 ohm each (DC Resistance of about .8 ohms at amp) and with my car running just before it sucked the life out of my alternator I reached 30 volts rms at about 50hz. These measurements were taken with a true RMS meter. At these voltages and not taking into account impedence rise, this is about 1100 watts. Out of curiosity I rewired my subs to 4 ohms each and paralleled them at the amp. DC resistance seen was 3 ohms. After reconfiguring my H/U and listening by ear for pronounced clipping I adjusted my gain to result in an rms output of 60 volts at the amps terminals. Not taking into account impedence rise losses this comes to right at 1200 watts.
Ok this by itself doesn't seem like much but here is the interesting part, at these rms voltages I never seen my voltage at the Amplifier drop below 13.-6-8 volts whereas at 1 ohm, these same wattages my amp would pull the charging system to below 12 volts.

The moral of this story is for those who have Hifonics amplifiers, try not to run anything below two ohms. Its been said before that running an amp at 1 ohm will decrease an amplifiers efficiency. This my friends is your proof. Its a known fact that running higher voltages into greater ohm loads is much more efficient, especially with AC driven motor structures (a speaker is a linear motor). Also the added benefit is the output is much more pronounced and cleaner sounding. Some people would say that the difference in damping factor is not noticeable i for one however believe I have noticed a difference.

Well it just seems to me my friend that you just can't keep up with the current draw of the amp. so you are saying not to run at 1 ohm because your charging system isn't up to par?

 

[Swindez95 10+ year member]

What im saying is basically these amplifiers can and will run at 1ohms but draw alot of current. I cant upgrade my charging system as noone makes a high output alternator for my car's engine. I was simply able to increase power output with a little less current draw by changing the ohms load from a supposed 1 to 2 ohms.

EDIT - For the same amount of output in watts between 1 ohm and 2 ohms my BX2005D demanded less current.

 

[captaincheesey 10+ year member]

Ever thought about just getting a better bat? Big 3? Bigger gauge wiring back to the amp? I mean there are more ways to help the flow of electrical current and make your car better able to handle the current draw. Like give us a breakdown of your entire system instead of us just knowing your subs and amp.

 

[Swindez95 10+ year member]

Yea ive done all those lol. Big 3, optima red top, ive only got a 4 gauge wire to my Hifonics but with my little 105 amp alty and everything else I have in the car...it just cant hold up...(im on my 4th alternator this year) I used to work at Advance so they have a lifetime warranty. To give you an estimate of what I have besides my stereo I have a full MSD Ignition DIS-4 ignition setup and between my headlights and foglights alone thats approx 510 watts with high beams on so...I dont have much room for anything else, I just have to keep things turned down so as not to let my volt hand drop below about 13 volts.

 

[Rashaddd 5,000+ posts]

This is why we need an IQ test before allowing people to post

 

[Swindez95 10+ year member]

What's that supposed to mean...I just simply posted this thread in order to help explain the difference in amplifier efficiency at different ohm loads.

 

[Swindez95 10+ year member]

Maybe I should have thought of a different name for this thread.

 

[Rashaddd 5,000+ posts]

How do you get a dcr of .8 ohms out of two 1 ohm nominal loads? (or you just fail at english)

Second, how do you get a dcr of 3 ohms out of two 4 ohm nominal loads? You've got some really high DCR subs I'm guessing?

Ok, well if that's the case, you were at what .5 nominal the first time? Hmm...something tells me that's a bad idea on a 1 ohm stable budget amp, especially when your electrical probably couldn't even support 2 ohms

Then you went and concluded you should never drop a hifonics amp below 2 ohms...

I guess you're right though..if YOU have an amp that will try to **** more current than YOU have below 2 ohms, we can safely say that nobody should ever run it below 2 ohms

 

[jaboran 10+ year member]

i dont find this as hard evidence saying all hifonics amps cant run properly at 1ohm

it just proves to me that yer electrical system can not handle the current draw of all that stuff u want to have it do... and attribute the problem to the amplifier...

i think it has to do with the electrical system rather than an amp

 

[Swindez95 10+ year member]

How do you get a dcr of .8 ohms out of two 1 ohm nominal loads? (or you just fail at english)
Second, how do you get a dcr of 3 ohms out of two 4 ohm nominal loads? You've got some really high DCR subs I'm guessing?

Ok, well if that's the case, you were at what .5 nominal the first time? Hmm...something tells me that's a bad idea on a 1 ohm stable budget amp, especially when your electrical probably couldn't even support 2 ohms

Then you went and concluded you should never drop a hifonics amp below 2 ohms...

I guess you're right though..if YOU have an amp that will try to **** more current than YOU have below 2 ohms, we can safely so that nobody should ever run it below 2 ohms

I have two IA LI 12's with 4 ohm DVC. Each voice coil actually read about close to 3 ohms instead of 4 and they are all different to some degree. Wired in parallel and then parallel again at the amp I was seeing a DCR of .8 Wired in series at the sub and parallel at the amp I saw a DCR close to 3 ohms. There is a large tolerance on my subs proposed ohm loads apparently. And yes I know my charging system cannot handle a 1 ohm load with this amplifier. I just simply like to have too much power just to have it even though I never use this amp to its full potential. Plus I got a deal on this amp new since it was an 05 year model amp and was Discontinued at an Ebay store for 250 bucks.

How do you get a dcr of .8 ohms out of two 1 ohm nominal loads? (or you just fail at english)

Yes I fail at English I just reread my first post and realized my mistake thank you for pointing that out, I meant to say 2 ohms per sub Paralleled at the amp for 1 ohm nominal.

 

[1rockford1 5,000+ posts]

i had one and it was fine at 1ohm.