Phoenix Gold Phorum

Hey guys, have 2 Rsdc 12s in a sealed box,1.25cu ft each, they were originally powered by a ryval1600but I then upgraded to a hifonics Brutus 1600, and dropped the impedance to 1 ohm,only took about 2 months and one sub is fried, amp went in to protect mode then I realized my sub is smoking! LOL, question, is the amp still fine and why the hell did my sub fry?! Thought these were good subs, just ordered 2 hifonics Atlas to replace em, thanks [/b][/i]

Well the thing about class D amps are they can produce alot more than their rated wattage when you turn the gain up too high. this produces a clipped signal and it basically sends very damaging waves to your subs. How high was your gain set, how much bass boost were you using? very likely the culprit. I guarantee I could run one rsdc on 1200 watts all day long as long as it was a totally clean signal, meening no distortion from the amp or signal source, i could also very easily blow up and rsdc with a class d 100 watt amp just by turning up the gain and bass boost up all the way(if the amp didnt fall first as it would probably take some time) My advice is to look into setting your gains with a multimeter, there is a very good guide for this in the how to section and it will help your amp and speakers to live a long healthy life. Some people on here say that it isnt needed and that it can be done by ear but some people on here arent trying to bump per say. I gather from your experience with the smoking sub that you like some bass. Check out the how to and if you have any questions everyone here is eager to help

ok maybe im exaggerating on the 100 watt amp but deifnateley a xenon 400.1 I would put some money on it

I'll have to agree with Wayne.....
It's very easy to not hear distortion in the woofer due to volume levels and improper adjustments will smoke woofers in a hurry. Another aspect to take into consideration are subsonic notes that we can't hear that can cause the woofer to have issues.

If yer going for SPL, buy SPL woofers and call it a day..... The RsdC is more of an SQL woofer IMO but they do get LOUD as fuk.

If I was you, I'd try to find yerself a pair of Funky Pups.

http://www.queuevonqu.com/funkypup.html

noticed a quote from someone we all know and love. Check out the 6th quote down lol

waynehead wrote:http://www.queuevonqu.com/funkypup.html

noticed a quote from someone we all know and love. Check out the 6th quote down lol

Dont you know he designed his speaker line from the FUNKY PUP

Ya I was thinking that, gain and bass boost were both set a little over half, I have satellite so I tend to listen to a lot of rap, that's why I got these subs though. Knew they were good for both sq and spl, maybe after the Brutus and having it at 1 ohm it was too much, with that ryval I had the gain and boost all the way up and they were still hungry, was gonna order another PG, but can't find em so I got 2 Atlas that are rated the same, wayta guys think?? Those Brutus kick out some power I guess!

found another

Originally Posted by denim
A funky pup once ate Chuck Norris for breakfast.

OM NOM NOM NOM like so.



lmfao

These are running of a top of the line Sony HU, kicker 1/0 for power with a cap to clean up the voltage, fused at 200 amps, also have the hifonics 4 way for up front? ??

Maybe the Pgs are a little underrated??

I have never heard any hifonics speakers so i couldnt say, i would think you will notice a slight degradation in your sq but should get loud still. If you can help it, avoid bass boost at at cost, a 3 db boost takes two times the power from the amp. so if you had you basst boost up half way you could have been making your amp play 9 db's louder at that frequency. Thats 4800 watts sir. That meens your amp has no option but to distort. i used to do it too, the first system i helped my friend put in his car had an alpine amp running four hollywood twelves, and we turned the gain and bass boost up all the way because if we didnt none of the speakers were really doing a whole lot. Let me tell you it was loud as hell, but what we were doing was asking a 600 watt amp to do so much more work than it was designed to do. didnt last very long.

if you meen the ryval amp then i would say that it would make its rated power which is only 600 watts at 4 ohm and 800 watts at 2 ohm. if you meen the rsdc's then no they arent underrated, just not designed to take 4000 watts of distortion.

You guys know what size magnets are on the rsdc's?

Ya I can't remember the ryvals rms power rating, I think it was maybe 800w, Brutus definately outdid that, subs didn't seem distorted at the level I had em but I could be wrong, had em only going up to 80 hz

FuzzyHoNutz wrote:I'll have to agree with Wayne.....
It's very easy to not hear distortion in the woofer due to volume levels and improper adjustments will smoke woofers in a hurry. Another aspect to take into consideration are subsonic notes that we can't hear that can cause the woofer to have issues.

If yer going for SPL, buy SPL woofers and call it a day..... The RsdC is more of an SQL woofer IMO but they do get LOUD as fuk.

If I was you, I'd try to find yerself a pair of Funky Pups.

no need for the sarcasm, I'm not an idiot, I'm a electrician so I understand the electrical part of it, just need a little guidance with the issue

Also these subs were only 6 months old

BTW, amp was still fine, ohmed out the voice coils, one was still 4 ohm, other was about 5.5

schroedes wrote:... with that ryval I had the gain and boost all the way up ...

chances are decent that the damage to the sub started at the Ryval amp and its settings, and was exacerbated by the new powerplant. I would be REAL interested to know if you replaced the blown woofer with an identical one if you had the same problem... somehow I doubt you would.

Also, you blew 1 of 2 subs? there may have been a defect with the sub that blew that would have surfaced even without replacing the Ryval amp... time and heat can float all kinds of things to the surface.

What ohm load were you using the Ryval at? Its only rated to 2-ohms... but since you put 1-ohm to the brutus I am guessing your running 2 dual-4-ohm 12's? You also said you "dropped" the ohm-load to the brutus from the Ryval... so were you running a 4-ohm load to the Ryval? that would have dropped the output to around 1200w (600w each)... which shouldnt have been a problem for the RSDC's... until you add in the bass boost and a clipped signal (max gain).

Last question - are you sure your box is sealed completely? its possible that one side may have developed a leak and you could have passed the mechanical limit of the sub and it shorted out internally...

NewOldStock wrote:

schroedes wrote:... with that ryval I had the gain and boost all the way up ...

chances are decent that the damage to the sub started at the Ryval amp and its settings, and was exacerbated by the new powerplant. I would be REAL interested to know if you replaced the blown woofer with an identical one if you had the same problem... somehow I doubt you would.

Also, you blew 1 of 2 subs? there may have been a defect with the sub that blew that would have surfaced even without replacing the Ryval amp... time and heat can float all kinds of things to the surface.

What ohm load were you using the Ryval at? Its only rated to 2-ohms... but since you put 1-ohm to the brutus I am guessing your running 2 dual-4-ohm 12's? You also said you "dropped" the ohm-load to the brutus from the Ryval... so were you running a 4-ohm load to the Ryval? that would have dropped the output to around 1200w (600w each)... which shouldnt have been a problem for the RSDC's... until you add in the bass boost and a clipped signal (max gain).

Last question - are you sure your box is sealed completely? its possible that one side may have developed a leak and you could have passed the mechanical limit of the sub and it shorted out internally...

ya i was thinking that maybe one sub was defected since the other was good, with the ryval i was at 4ohms total impedance, box is a groundshaker with 3/4 mdf sealed, havent seen any leaks, t6hats why i was trying to figure this out, guess it could be as simple as too much gain, how do i set up the new subs right??

o now you tell me you are an electrician, after i try to explain things very carefully.lol. Alot of people that come on here are not real savvy with electricity. Newoldstock made a few very good points. Setting your gains with your DMM would be a great way to avoid future problems, as well and making sure you have no leaks in your box. never thought of that myself. If you are looking to get rid of the rsdc that you have left let me know. also, please excuse the funky pup joke. there is an ongoing joke with them on alot of audio forums. I know fuzzy meant nothing towards you.

waynehead wrote:o now you tell me you are an electrician, after i try to explain things very carefully.lol. Alot of people that come on here are not real savvy with electricity. Newoldstock made a few very good points. Setting your gains with your DMM would be a great way to avoid future problems, as well and making sure you have no leaks in your box. never thought of that myself. If you are looking to get rid of the rsdc that you have left let me know. also, please excuse the funky pup joke. there is an ongoing joke with them on alot of audio forums. I know fuzzy meant nothing towards you.

lol, thanks man, ya i guess i have a extra rsdc now, looking forward to comparing them to the atlas i ordered, those rsdc's were very versatile, how exactly would i set my gain with my meter? thanks guys

I'm just fukin with ya Sparky.................

Something else to look into might be a line driver. Most of the HU's these days provide 2V-5V of signal power. CHECK YER MANUAL for the max input voltage as all are different, but giving the PG amp a clean 7-8V will keep you from having to jack up the gain and boost levels to get the volume you want.

FuzzyHoNutz wrote:I'm just fukin with ya Sparky.................

Something else to look into might be a line driver. Most of the HU's these days provide 2V-5V of signal power. CHECK YER MANUAL for the max input voltage as all are different, but giving the PG amp a clean 7-8V will keep you from having to jack up the gain and boost levels to get the volume you want.

ya the sony i have puts out 4v, thats about as high as i could find, where would you get 7-8 volts???

square root(wattage * speaker load) = voltage

download a 0db 60 hz sine wave
take the square root of 1600 and if you put your multimeter on the amp terminals that should be it. i think. always a good idea to unhook you speakers because sine waves arent good for them. this is the link for the how to
http://phoenixphorum.com/gain-setting-w ... vt280.html