Hifonics Marketing, or Truth?

[tinmanchris217 10+ year member]

Hey Guys,

Found this on the Maxxsonics forum, and needed to know if there is any truth to it.

QUOTE:

"__username__,

 

Unfortunately you are allowing yourself to fall into the "old school" way of determining an amplifiers POTENTIAL output based on fusing.

 

This was acceptable in the days of inefficient class a/b's, but you must understand that these amplifiers are far more efficient designs, a fuse can handle double it's rating for short periods of time, and music is transient meaning that the output constantly varies.

 

Nothing irritates me more than looking at all of the posts on random forums about GUESSING output based on fusing. "

According to this guy, we can't accurately debunk the HF Bxi1210's potential this way:

Fuse = 80 amps

Voltage = 14.4 V

80 X 14.4 = 1152.

Class D's are 70% eff. at 1 ohm, generally...

RMS Power ~ 800w

Is it "old school" to question where the extra 50% power comes from?

I feel sure that someone on the site knows a proper explanation, because I just can't accept "magic" as truth when someone says so.

TIA guys.

Chris

Click to read more...

 

[cx-7heaven 10+ year member]

I dont know about double the fuse rating, but I do know they can take a bit more than rated for short bursts AKA drumbeats, bass hits, but not for long drawn out periods AKA test tones. I would guess that hifonics you quoted there could do it's rated in that situation.

 

[JimJ 5,000+ posts]

Marketing is the best when there's a grain of truth buried somewhere in it //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

He's right about fuses being able to handle more than their ratings for a short period of time, but the very definition of a continuous power rating is a non-transient condition...

 

[cx-7heaven 10+ year member]

Maybe they deep freeze the fuses so they wont blow right away //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[JimJ 5,000+ posts]

Maybe they deep freeze the fuses so they wont blow right away //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

Thankfully cryo treating hasn't brainwashed people in the 12V world...

yet //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif//content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

 

[tinmanchris217 10+ year member]

Exactly my thinking, JimJ.

The definition of continuous power (not RMS) is sustainable power... transients are handled by the caps in the power supply, and why you have amps claiming 1000wRMS / 2000wPEAK.

Excuse the poor example, but:

Is it possible to have an amp that sits under the limbo bar, humping it from below, constantly?

Just barely staying under the fuse rating, while doing 50% more power. If so, sign me up!

 

[Grinder1989 5,000+ posts]

its a POS amp anyway.

 

[SavageBlackout 10+ year member]

its a POS amp anyway.

sure //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif

 

[mcsoul 10+ year member]

I knock 1/4 off hifonics bxi rated power.

They say 1200, I'm looking for 900 out of it

and happy if it does more, I would not set the

gain for rated unless I was sure it was not

clipping.

 

[roarzorz 10+ year member]

Total BS. An amp that only pulls 80a of current will not output 1200watts @ 1ohm in a 12v setup. It would have to be like 105% efficient with a rock solid 14.4v input. Neither of which are happening in a real world scenario. You're realizing why everyone talks about how over-rated the Hifonics Brutus amp are.

 

[Grinder1989 5,000+ posts]

sure //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif

Want proof? How about cheap, small package parts, cheap outputs, nothing heavy duty and over rated power outputs.

 

[SavageBlackout 10+ year member]

Want proof? How about cheap, small package parts, cheap outputs, nothing heavy duty and over rated power outputs.

maybe cheap, but not shit. i've owned multiple brutus amps. sure they're not the best, but great for the money, and i've never had a problem with them

 

[tinmanchris217 10+ year member]

Slow down, guys.

It's not my first trip round the block. I know that Hifonics does slightly overrate their amps (except the XX, etc. lines). They also put out good quality amps at a great price.

I'm not here to rag on them, and if you are, please go to the next thread.

My question was is there any validity to the argument about short-term fuse magic? (dancing under the limbo stick)

 

[oldschoolboomer 10+ year member]

no validity. They should be using ils instead of rms for their ratings.

 

[mcsoul 10+ year member]

Slow down, guys.
It's not my first trip round the block. I know that Hifonics does slightly overrate their amps (except the XX, etc. lines).

My question was is there any validity to the argument about short-term fuse magic? (dancing under the limbo stick)

JimJ is correct, rms rating should be non-transient. Limbo stick dancing is not

continuous output.