XSVTOYZ Posted January 15, 2019 Report Share Posted January 15, 2019 ok so I read this forum and fixed my own problem I was not clipping because of low voltage (lights dimming) I was low voltage from clipping the snot outta my woofers. I didnt kill either of them but could smell the sweet smell of the glue getting hot so I turned em way down and still making good noise and no voltage drop ? no dd1 and no oscope I do have a dmm so Im figuring these jbl gtx 500 easily do rated there is a dyno run that shows near 700 watts so I was thinking ( I know bad) 40hz tone and set to 30-31v should get me near enough to 500 on each at 2 ohm and avoid clipping myself to the poor house but get me close to getting my power out of the 2 does this seem feasible? another question I have a pair of boxes that are vented but these amps lack infra sonic (sub sonic) so I was thinking of sealing them up not really worried about output for the moment they are a bit muddy sounding out of the port and I hope to tighten this up what do you guys think? thanks for any replies yeah I am bumping on the cheap! Link to comment Share on other sites More sharing options...
MrSkippyJ Posted January 16, 2019 Report Share Posted January 16, 2019 How does a DMM avoid clipping? F150: Stock 2019 Harley Road Glide: Amp: TM400Xad - 4 channel 400 watt Processor: DSR1 Fairing (Front) 6.5s -MMats PA601cx Lid (Rear) 6x9s - TMS69 Link to comment Share on other sites More sharing options...
XSVTOYZ Posted January 16, 2019 Author Report Share Posted January 16, 2019 a dmm gives a base line of output same as they used to do before the cool tools I was hoping by setting the max watts it will out put then I can avoid over running my power limit same effect as an oscope just not able to verify the sine wave if I can do the math 31.6 is 500 watts by setting under the max at 30 flat I can at least have some confidence puts me in the ball park of 450 each its better than just guess Link to comment Share on other sites More sharing options...
reedal Posted January 16, 2019 Report Share Posted January 16, 2019 It's not better than just guessing. No matter what they used to do, and what a lot still do, it's still just a guess. You're assuming that amp is clean to 500w. Maybe it did good on someone's dyno video, but not every electronic component is the same from your amp to that one. How do you know when your HU begins to distort the signal? Then there's the 40hz tone you are using. How did you source it? Is it clean? Is it attenuated, if so, how much? There are more factors to a clipped signal than amp voltage output. Check out the SMD tool map to see if there is someone local to you who has an oscilloscope or DD-1. It's a much better feeling to know when the signal distorts. SMD Tool Map https://www.stevemeadedesigns.com/board/topic/193176-smd-tool-map-new-november-2014/ Build log https://www.stevemeadedesigns.com/board/topic/197217-reeds-03-tahoe-hat-sqaq-singer-xs-shca-cockbox-80prs/?page=32 Link to comment Share on other sites More sharing options...
XSVTOYZ Posted January 16, 2019 Author Report Share Posted January 16, 2019 On 1/2/2019 at 7:35 AM, reedal said: Use multimeter to find the output ac voltage of each amp while playing a tone (40hz is what most use) after youve set the gain where it needs to be (clean undistorted setting), and then to match them, use the amp showing the lower voltage as your reference and turn the higher voltage amp gain down to match. No slave if not strapped. Both will need to be set to master. isnt this you from jan 2? I am not a fool nor a punk kid was an ase master and have had several systems only smoked 1 woofer in my 54 years of age never have had a dd1 or oscope to set my gains, not really ready to chase one down either just wanted a little confirmation of my plan your earlier post confirms what I wanted to know "it will work fine" pionneer nex 5000 at volume 30/42 should be clean and at 30v on the jbl gtx I should be clean Steve Meade did the dyno run and I am sure he didnt give the gold 2 thumbs up for kicks I really would like a little input on the sealed idea as well Link to comment Share on other sites More sharing options...
ckeeler11 Posted January 16, 2019 Report Share Posted January 16, 2019 That should work fine. No disrespect to Steve and his products but the DD1 is not error free, if I did more amp tuning I would probably buy one, as most devices are not so use what you have at your disposal and do the best you can. I would say also learn to listen to what a sub sounds like when it is playing distortion that will help. Link to comment Share on other sites More sharing options...
reedal Posted January 16, 2019 Report Share Posted January 16, 2019 1 hour ago, XSVTOYZ said: isnt this you from jan 2? I am not a fool nor a punk kid was an ase master and have had several systems only smoked 1 woofer in my 54 years of age never have had a dd1 or oscope to set my gains, not really ready to chase one down either just wanted a little confirmation of my plan your earlier post confirms what I wanted to know "it will work fine" pionneer nex 5000 at volume 30/42 should be clean and at 30v on the jbl gtx I should be clean Steve Meade did the dyno run and I am sure he didnt give the gold 2 thumbs up for kicks I really would like a little input on the sealed idea as well Gain matching and setting the gain properly at clean undistorted are different things, which is why in that quote i said "after youve set the gain where it needs to be (clean undistorted setting). Setting each amp to its max clean undistorted setting (using proper signal measuring tools) and then lowering the gain of the amp with higher output voltage (measured with any meter that reads AC voltage) to match the lower output amp is a very safe practice. No one called you a fool or punk kid, nor did i say anything disrespectful. I only provided my insight to setting gain via dmm. I do hope that you now understand the difference between gain matching and setting gain to output a clean signal. SMD Tool Map https://www.stevemeadedesigns.com/board/topic/193176-smd-tool-map-new-november-2014/ Build log https://www.stevemeadedesigns.com/board/topic/197217-reeds-03-tahoe-hat-sqaq-singer-xs-shca-cockbox-80prs/?page=32 Link to comment Share on other sites More sharing options...
reedal Posted January 16, 2019 Report Share Posted January 16, 2019 As for sealed, you didnt mention what sub(s), but most manufacturers provide specs for both sealed and ported enclosures. You can stick to those or try a free modeling software such as WinISD to see how your response will be with different enclosure sizes to ensure it responds closer to your liking. SMD Tool Map https://www.stevemeadedesigns.com/board/topic/193176-smd-tool-map-new-november-2014/ Build log https://www.stevemeadedesigns.com/board/topic/197217-reeds-03-tahoe-hat-sqaq-singer-xs-shca-cockbox-80prs/?page=32 Link to comment Share on other sites More sharing options...
XSVTOYZ Posted January 16, 2019 Author Report Share Posted January 16, 2019 sorry if I came across a little but hurt my apologies I am gain matching as well both the gtx 500 I just dont like to borrow anything also my tool box walked out the garage before xmas ggggrrrr (hate thieves) I know its old school and not exact it will require a little feel and some attention to what I am doing but I just want to protect my investment as best I can and still enjoy my hobby the boxes are old kicker slim boxes and skar audio vd-10 stuffed inside they work great with the jbl gtx 500 500w rms amp 500w rms speakers just no low pass filter and the low lows are muddy sounding I am broke and I have less than 0 wood working skills so box building isnt something I can do, but I can make a plug and seal the boxes!! Link to comment Share on other sites More sharing options...
reedal Posted January 17, 2019 Report Share Posted January 17, 2019 No hard feelings here. Try it out, but make the plug easily removable in case it sounds worse than before. SMD Tool Map https://www.stevemeadedesigns.com/board/topic/193176-smd-tool-map-new-november-2014/ Build log https://www.stevemeadedesigns.com/board/topic/197217-reeds-03-tahoe-hat-sqaq-singer-xs-shca-cockbox-80prs/?page=32 Link to comment Share on other sites More sharing options...
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