View Full Version : So am I doing something wrong with the RSS390HF modeling?
05-14-2009, 10:29 AM
Been looking around at the 15" drivers as of late and I saw a recomendation for the RSS390HF
The sealed box is about 3.25 I believe and all are powered by 650w from an EP2500
I modeled it in a sealed, ported sono tube, and a ported sonotube av15x. The HF driver seems to have a much higher SPL at the low end then the AV15x but looses out at around 30hz and above in the SPL range when porting. I have compared it to other drivers also(shiva, mach V) with the same result, the HF has higher SPL at lower freq but looses out at 30 and above.
I was thinking of doing a multiple sub sealed sub setup for a my home theater, I don't listen to music in it, and from cost/peformance ratio these subs look to be a really good value.
But did I do something incorrect?
05-14-2009, 10:41 AM
Keep in mind that the rss390hf is not a high spl sub. I run mine sealed in about 70l for SQ.
Your plot has a giant peak around 30hz. This is most likely due to incorrect port tuning. Try lowering the tuning. This should take care of most of it. You may also need a larger box for your LF goals.
05-14-2009, 11:49 AM
I agree. Your tuning seems to be a off - you shouldn't have such a big peek on the low end like that.
After some modeling, this is what I found:
- Not surprisingly, the AV15X will yield a decent amount more output as it can handle more power thanks to it's longer excursion. This gives it a modeled SPL increase of around 8 dB if you can feed it 1000 watts as opposed to the 400 it takes for the Dayton to become nonlinear. Real world results will vary, but if you have the power the AV15X will be louder without a doubt if you have the power. Granted, the Dayton should still be good for around 110 dB or so.
- The AV15X also does better than the Dayton does in smaller boxes (not small, but not 10 cubes like the Dayton either :eek: If you're considering going the sonotube route, assuming a 16" inside diameter and nothing taking up volume in the box (driver, bracing, etc) you're looking at a tube that will be 4.75 feet long to reach 10 cubes of volume.
- The Dayton does great in a big box tuned very low, which enables it to have a very flat response down to around 20 Hz (your in room response will vary).
- Due to the Dayton's limited excursion, you really shouldn't feed it more than 300-400 watts.
(not going to take up a lot of thread space by showing all the images, you can click them if you want to)
05-14-2009, 12:27 PM
I modeled both the AV15 and the RSS390HF. What i found was the AV15 really needed a vented enclosure and to dig a little deeper and louder adding PR's to the mix helped out a bunch. The AV15 does have more power capability the the 390 for sure.
My goal was a HT and Music sub. Tough to do. So after purchasing the 390 and finding out later that it modeled a little better than it could perform in a 4.2cf sealed box for the power and performance at or below 20hz. I too was planning to run the Ep2500, Fbq2496, and REW. The 390 just couldnt handle my HT goal at all. Stangbat bought my 390 and is using it nicely for music only with his Aura ZDT towers.
I ended up buying the CSS SDX15. This baby can handle tons of power at and below 20hz in the same size sealed box. If fits my bill perfectly for my HT, Music goals. Rumbles loud and shakes my house to its bones in HT, yet tight and punchy for my musical needs. I think you should look into this driver as well.
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