posted
I know you guys have heard this question a million times, but I'm not asking you to estimate it on my system. I'm just wondering if there is some kind of equation that you all use. My system will be moddest, but it won't be a true SPL machine. I'm just wondering what the equation is for future reference. What does it take into account? Internal cabin volume? What about trunk volume? I'm sure cone area and power are used too. Any input would be greatly appreciated. Thank you!!
------------------ Dusty Roads
Ridin' around in a stock 2001 Nissan Maxima SE. No stereo mods YET Check out a description of my old system and a system diagram. My System
Posts: 79 | From: Palatine, IL, USA | Registered: Jan 2000
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So then what do you do, when someone asks to estimate their SPL output? Guess?? C'mon there has to be a bit more scientific process than that. I mean c'mon. Okay, let's say for instance I am going to run a pair of DX700's with a pair of Kicker 15" square solo's what will that do? How about a pair of JL 15W3's instead of the Kickers? Anyone else have any input. I'm just wondering how you come up with the numbers.
------------------ Dusty Roads
Ridin' around in a stock 2001 Nissan Maxima SE. No stereo mods YET Check out a description of my old system and a system diagram. My System
Posts: 79 | From: Palatine, IL, USA | Registered: Jan 2000
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I have an old Excel worksheet Troy from this board made up. Its about as decent as a scientific guess is going to be. Otherwise it is just not possible to predict how every system is going to sound with every box with every amp in every car with every battery and every deck and it goes on for days... If we could we wouldnt need to even hold contests or use meters. The only way you can get a good idea is if someone ran the almost exact same system in another car, and then it wont always be the same.
------------------ TEAM THUNDER TEAM NOISY TOYS From the creator of the "Wonder Box" and the "Hell Box" comes the newest creation- "The Coffin"
I know what you are saying and I'm starting to see that it's is just people making intelligent guesses based on similiar equipment in similiar cars. You are very right that there isn't a way to truely predict it and if there was, then the fun of competition wouldn't be there. It would be al about you has the perfect setup for each car and who spent the most monay on it. Thanks for your thoughts, I really appreciate it.
------------------ Dusty Roads
Ridin' around in a stock 2001 Nissan Maxima SE. No stereo mods YET Check out a description of my old system and a system diagram. My System
Posts: 79 | From: Palatine, IL, USA | Registered: Jan 2000
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I know what you are saying and I'm starting to see that it's is just people making intelligent guesses based on similiar equipment in similiar cars. You are very right that there isn't a way to truely apredict it and if there was, then the fun of competition wouldn't be there. It would be al about you has the perfect setup for each car and who spent the most monay on it. Thanks for your thoughts, I really appreciate it.
I probably overdone that but the problem is that your ears cant discern different SPL readings accurately with a fixed reference like a calibrated meter. The problem is that many times one frequency may sound louder than another but read the opposite on a meter. You are correct, you can make fairly close guesses if you have been at a lot of comps and are familiar with the basics but I can think of about 20 variables off the top of my head that make noticable differences in a system from large things to things you normally wouldnt think about having to do with SPL. Also there are different pressure regions in a car due to the dimensions, shape, materials the interior is made of and how everything interracts together. Like you stated its about finding the best combination of equipment, enclosure and vehicle. Its weird but something that hits like crazy in one car and should do great in another can be put in and suck in the second vehicle. But in a nutshel some different things to consider are: Cone area Sub specs Box type Box size Power, rated vs what the subs are seeing due to impedence rise in enclosure voltages the amps may be seeing pre out voltage of the radio box placement in the vehicle crossover and/or sub sonic filter settings vehicle size vehicle shape mic placement interior materials interior is rigid or flexy air temperature air humidity enclosure tuning and/or Q condition of equipment enclosure losses vehicle losses frequency played equipment temperature seats in/out of vehicle interior reinfoircement or damping
anyway you get the idea. But the easiest thing you can do that is about as accurate as anything off your head is go to a lot of contests and listen to different cars and pay careful attention to what they are hitting. And dont forget frequency/power arte very important things to keep in mind. When you get a lot of experience you can usually guess many cars withing a couple of db. I dont like to try that with anything over mid 150s since I want to keep my hearing as long as possible though. Hope this helps..
------------------ TEAM THUNDER TEAM NOISY TOYS From the creator of the "Wonder Box" and the "Hell Box" comes the newest creation- "The Coffin"
posted
Thank you Buzz!! I appreciate the time you spent sending that post. Very informative. I plan to get to more shows soon, so I can begin to get an idea of what people run and the numbers they hit. Again thank you for you thoughts and ideas!!
------------------ Dusty Roads
Ridin' around in a stock 2001 Nissan Maxima SE. No stereo mods YET Check out a description of my old system and a system diagram. My System
Posts: 79 | From: Palatine, IL, USA | Registered: Jan 2000
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Very important factor is also experience of installer. So if someone is asking ''how much will I hit if I will put same stuff in car like some world champion'' do you think that my answer will be: yes you will hit the same!?
So basically this are just estimations from watching what are others doing in similar cars with similar equipment with similar experience.
posted
i just do a guess off the top of my head, was within .1 a couple weeks ago, made me feel proud there.
------------------ 2 Nonexistent Subwoofers Powered By A Nonexistent Amplifier All In A Nonexistent Car 000.00 Dbs Team Nonexistent So Loud You Can't Hear Me! Damn College Education
Posts: 2063 | From: South Bend, IN | Registered: Jun 1999
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Since we're braggin' a bit, I guessed the first competition enclosure I built at my first ever competition, .2dB high, 30 seconds b4 the burp. - Boy did I feel special
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