Bakerman Posted January 20, 2019 Report Share Posted January 20, 2019 So, when I'm looking at headunits, it always has an RMS value x4. For example, it says RMS 40watts x4 channels. My question is, does this mean each output is 40 watts RMS, or is the total 40watts RMS (10watts/channel). Also, is there an impedance rating on these things? I understand how amps and woofers work with ohms and such, and how to wire in series and parallel. But I never seen anything on impedance for these headunits, but the component sets always show an impedence. Just dont want to overload my head unit by wiring a mid driver and tweet to the same output channel. Link to comment Share on other sites More sharing options...
Broke_Audio_Addict Posted January 20, 2019 Report Share Posted January 20, 2019 They usually mean 40watts per channel, thats usually peak power but they lie about power ratings just like amp companies so take that for what its worth, rms is usually half or less of that peak rating Most headunits are rated for 4ohm to 8ohm there are a few out there capable of handling 2ohm loads though. That being said a lot of people's definition of "music" is a clipped 30 hz sine wave with some 80 IQ knuckle head grunting about committing crimes and his genitals. Link to comment Share on other sites More sharing options...
bcbrassard Posted January 20, 2019 Report Share Posted January 20, 2019 I think Steve measured the new sony HU on his hand held rms unit for output ratings and it did 50+ watts per channel. But most HU run 12-20 watts rms. Component sets like being amplified to sound there best. Playing them off a HU will work but not give you the WOW factor your looking for. Sometimes your stock speakers can sound better because there are efficiently designed to run on low power and sound good doing it. Make sure you think about speaker prep too, sealing and deadening speaker location for best sound. Link to comment Share on other sites More sharing options...
MotorCityFats13 Posted January 21, 2019 Report Share Posted January 21, 2019 the tweeter and mid were designed to work together if the spec says 4ohm then its 4ohm.... think of them like a 4 way 6x9.... years ago I used to run multiple sets of speakers on a headunit channel 2 ohm and never had a failure but that was before I started putting amps on everything Link to comment Share on other sites More sharing options...
XSVTOYZ Posted January 22, 2019 Report Share Posted January 22, 2019 with the size of amps and the cost you can get an amp for a inexpensive cost not amplifying seems like you might pass a good quality head unit because it didnt have a high power rating you can get a good head unit and not worry about rms audio pipe gets alot of grief for not doing rated but I got a 5 channel for $119 sounds way better than head unit alone and a cheap pre boxed sub took a weekend of watching a you tube videos on how to take apart what I needed next weekend took a few hours wife is happy and I dont mind taking her car once in a while Link to comment Share on other sites More sharing options...
Kyblack76 Posted January 22, 2019 Report Share Posted January 22, 2019 Aftermarket comp set,.... ran off just the HU ? ... ugh,.... Try get a amp man,... any amp. Best upgrade you can do IMHO. Id probably rather keep the stock drivers (speakers), and get a amplifier for them, than some aftermarket drivers, just ran off any HU. Just my .02. Monster difference from my experience SMD SUPER SELLER The Burban Build Blazer Build sold Acura trunk build sold Link to comment Share on other sites More sharing options...
paidnfull Posted January 22, 2019 Report Share Posted January 22, 2019 Most name brand headunits do around 15-20 watts rms (the difference between 15 and 20 should be inaudible). I don't know what radio Steve tested, but Sony does have a radio that's been out for a couple years with a class d 40x4 amp built into it. It's 40 rms per channel. Mex100 and mex120. They definitely have a different sound to them, but an external amp (even a kicker 40x4) still seems to have more ass to it, probably because you can overdrive it a bit and still achieve good results. Link to comment Share on other sites More sharing options...
Bakerman Posted January 24, 2019 Author Report Share Posted January 24, 2019 I have a HiFonics 4 channel that I will most likely use to power the components. I am not sure if it is a Brutus, or a Zues. And it is old...like 10+ years old. I purchased it years ago, and never used it. Now it sits in a storage unit, along with a shit ton of other audio equipment I NEVER used from back in the day. I have a set of the old Fi BTL's with the saucer magnets in there, and even a couple of AQ 2400 amps. Back from before AudioQue made the change over to SoundCubed, or whatever the fuck they are now. So, I will be powering the mids and highs on the amp. I was just curious how the distribution was on the headunits when they give that power rating. Link to comment Share on other sites More sharing options...
Bakerman Posted January 24, 2019 Author Report Share Posted January 24, 2019 HiFonics Zues ZXi4406 Link to comment Share on other sites More sharing options...
XSVTOYZ Posted January 24, 2019 Report Share Posted January 24, 2019 makes more sense now there have been a few high power double dins but they never really caught on I guess for the fact you got the $$ for a pricey head unit you got the $$ for an amp Link to comment Share on other sites More sharing options...
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