Whats your favorite tune for an RL-P15?

[Jerm357]

Please post your tune for your RL-P 15 and why you chose it. I would like to see how low every one is tuning these things. I choose the 17hz tune because I am using it in a very small room and figured that room gain would be a big help so there was no need to tune much lower.

[Sonnie]

I want a 5hz tune... uhhh, erhhh... is that possible? I got four and just need to get them plugged up.

[Darren]

Mine might as well be 5Hz... flat to 10Hz is all I'm able to measure but I'm sure it is reasonable at 5Hz.

Sonnie, when you gonna get those 4 monsters up in the ceiling?

[JCD]

Darren wrote:

Mine might as well be 5Hz... flat to 10Hz is all I'm able to measure but I'm sure it is reasonable at 5Hz.

Sonnie, when you gonna get those 4 monsters up in the ceiling?

Seriously, you've had those things forever! Stop reading this and start crawling in your attic!

JCD

[chasw98]

My favorite tune for my RL-p15 is the Telarc recording of the 1812 overture when the cannons go off!

[SteveCallas]

For the D2, I find a modeled 15.5hz tuning (which equates to a real world tuning of ~14.3hz) looks to give the most balanced performance

[Jerm357]

Agreeded, I have since changed my tune from 17hz to 15.45hz and have experienced better SQ. I also did not notice a loss of over all output from lowering the the tune this much.

[WillyD]

SteveCallas wrote:

For the D2, I find a modeled 15.5hz tuning (which equates to a real world tuning of ~14.3hz) looks to give the most balanced performance

Steve, I see you say this all the time, but what kind of modeling are you doing where the "real world" tuning comes out to be ~1Hz lower than the simulated? Mine came out to be about the same.

[Sonnie]

How would/do you test it?

[SteveCallas]

Willd wrote:

Steve, I see you say this all the time, but what kind of modeling are you doing where the "real world" tuning comes out to be ~1Hz lower than the simulated? Mine came out to be about the same.

I believe you used a molded plastic port and took half the flare radius into account when calculating port length. That's the "proper" way of doing it, but I recommend port lengths without including the flares, so then when the roundovers are added, the tune is a bit lower. I do this because a slightly lower tune is a good thing and the less calculations I have to do the better.

Sonnie, you can test what the actual tune of a sub comes out to be by taking a close mic FR sweep of the driver. Basically you set up the mic about 3" back from the center of the driver and do a FR sweep so that the port output doesn't get to contribute in the measurement. The response should look similar to a sealed response with a noticable temporary dip at the tuning frequency, as the driver in a ported subwoofer moves the least when it is directly coupled with the air in the port. Below that there will be a slight resurgence and then ultimately the rolloff.

[WillyD]

I believe you used a molded plastic port and took half the flare radius into account when calculating port length. That's the "proper" way of doing it, but I recommend port lengths without including the flares, so then when the roundovers are added, the tune is a bit lower. I do this because a slightly lower tune is a good thing and the less calculations I have to do the better.

That explains it.

[buggers]

I have the RL-P15 D2 and I would like to make it 300 Liters which I believe would make the sonotube about 60 inches tall. What would the 6 inch port length be to get the lowest tune. I tried to use winisd and that other excel file but I do not know how to use these tools. Can you help me?

[vitod]

This is based on 300L tuned to 14hz.

[buggers]

Thank you very much.