SnowDrifter Posted November 20, 2011 Report Share Posted November 20, 2011 Don't forget that long ports will begin to act like a t-line at certain frequencies. They will begin to develop their own resonating frequency if you start to get too long ~~~~~~~~SAY NO TO PHOTOBUCKET~~~~~~~~ Snow's DD-1 tracks here: https://www.stevemeadedesigns.com/board/topic/167433-snows-dd-1-tracks/ My take on OFC vs CCA: https://www.stevemeadedesigns.com/board/topic/110381-things-that-piss-you-off-in-the-car-audio-world/?do=findComment&comment=2461444 Link to comment Share on other sites More sharing options...
STEvil Posted November 20, 2011 Report Share Posted November 20, 2011 Don't forget that long ports will begin to act like a t-line at certain frequencies. They will begin to develop their own resonating frequency if you start to get too long er, thats the main point of a port MickyMcD - "Capable of making some serious trouser flapping volumes at where's-my-testicles frequencies, the Servo-Drives used to be fairly jaw dropping..." Any time you have have a power wire next to your frame put some rubber hosing (or cut up an innertube) around it. The wire is bound to wiggle (due to driving or flex) and the casing will eventually wear through. Hammerdown... 1% no links to outside websites, business related FB/YT pages allowed. Link to comment Share on other sites More sharing options...
SnowDrifter Posted November 20, 2011 Report Share Posted November 20, 2011 Don't forget that long ports will begin to act like a t-line at certain frequencies. They will begin to develop their own resonating frequency if you start to get too long er, thats the main point of a port As in the port will develop it's own resonant frequency separate from the rest of the box and it's designed tuning point. Could give it a muddy sound. ~~~~~~~~SAY NO TO PHOTOBUCKET~~~~~~~~ Snow's DD-1 tracks here: https://www.stevemeadedesigns.com/board/topic/167433-snows-dd-1-tracks/ My take on OFC vs CCA: https://www.stevemeadedesigns.com/board/topic/110381-things-that-piss-you-off-in-the-car-audio-world/?do=findComment&comment=2461444 Link to comment Share on other sites More sharing options...
STEvil Posted November 21, 2011 Report Share Posted November 21, 2011 in that case its just poor port design MickyMcD - "Capable of making some serious trouser flapping volumes at where's-my-testicles frequencies, the Servo-Drives used to be fairly jaw dropping..." Any time you have have a power wire next to your frame put some rubber hosing (or cut up an innertube) around it. The wire is bound to wiggle (due to driving or flex) and the casing will eventually wear through. Hammerdown... 1% no links to outside websites, business related FB/YT pages allowed. Link to comment Share on other sites More sharing options...
Fish Chris Posted November 21, 2011 Report Share Posted November 21, 2011 Okay. Right. That did seem to make an improvement of a DB or two.... Peace, Fish Hey Gaming, I'm just curious as to why I (or my system) would be an example ? I think mine plays pretty darn loud and clear. Of course I'd like more... Wouldn't we all ? But anyway, I have three 6" dia ports, with a length of 30" each, for a tuning of around 31 hz, and again, I'm pretty happy with it. Would like to triple my power, but..... The only thing I'd do different next time, is to run a single, larger vent > but keep in mind, if I wanted to go with the same sq inches of port that I have now, that vent would also be 30" long. If I wanted to bump it up to say 30% more port area (for longer throw subs) the vent would probably jump to 45" ! And I believe, it would still sound perfectly fine, as long as it were tuned correctly.... But come to think about it, I believe somebody already said that.... So, I concur Peace, Fish I think (don't quote me on this) that a long port like that reduces the sound quality (Fish Chris as an example)t. As far as efficiency goes, I don't believe so, but... I can't really say for sure. It was when you had the different length ports coming out of your box, and you eventually chopped them down to (I believe) 6" each, and you said it sounded better. That's what I was referring to. Link to comment Share on other sites More sharing options...
Joe X Posted November 22, 2011 Report Share Posted November 22, 2011 On slot ports height and width should be kept no more than 9:1 relationship or there will be losses on the corner due to excessively narrow port. Also there is an equation for minimum port area, this is to limit the airflow speed on the port. Losses on the corner if I remember right increase in a non linear way as airspeed go up but you may want to better research this. And yes if you tune your port low you will waste energy playing near subsonic frequencies. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.