| |
| ![]() | ![]() | |||||||
| SoundSplinter Dual RL-p15 D2 LLT Sub Project...Discuss Dual RL-p15 D2 LLT Sub Project... in the DIY Speakers and Subwoofers forum; Dual RL-p15 D2 LLT Sub Project... Again, no worries, it's not arguing, it's discussing
Agree! You guys create some very healthy discussions IMO... if others followed ... |
|
| | Thread Tools |
| | #151 (Link) | ||||
| | Re: Dual RL-p15 D2 LLT Sub Project... Quote:
![]() | ||||
|
| | |
| | |
| | #152 (Link) | |||||
| Re: Dual RL-p15 D2 LLT Sub Project... Okay. It can be done with an SPL too, of course then you won't be able to see where it starts to compress because SPL meter grabs only the peak SPL (total power), not the frequency response. Just monitor the master volume vs. SPL relationship. When the SPL doesn't rise by 5 dB or what ever you are adding, that's the point where your subs are starting to compress. Quote:
Quote:
| |||||
|
| | #153 (Link) | ||||
| | Re: Dual RL-p15 D2 LLT Sub Project... Quote:
![]() | ||||
|
| | #154 (Link) | ||||
| Re: Dual RL-p15 D2 LLT Sub Project... Quote:
That thing looks awesome, Sonnie (and Rodny). Sometime when I'm in Alabama... -- Otto | ||||
|
| | #155 (Link) | |||
| | Re: Dual RL-p15 D2 LLT Sub Project... I'd much rather be in Colorado than Alabama, but we'd love to have you visit with us sometime. Yep... 1 notch on the receiver is 1db... ![]() I took a couple of measurements with REW on the Behemoth. I did scroll the chart up so that you could see the full measurement, but the proportion is our standard. Blue is 3" from center of driver Red is center of port exit ![]() ![]() | |||
|
| | #156 (Link) | |||
| Re: Dual RL-p15 D2 LLT Sub Project... So with a ported design, where does someone correctly take a nearfield measurement to ensure optimum assist from the port effect while eliminating as much effect as possible from the room? Your graph shows exactly what I would expect. Right at the cone, we see the pure speaker output without the port effect (more like sealed I suppose). Then right at the port output, we see the port assist. Where do they combine to produce the pure speakers total output before the room wrecks it? My limited knowledge of speaker design is showing.... Steve? Ilkka? Sonnie? brucek | |||
|
| | #157 (Link) | ||||
| | Re: Dual RL-p15 D2 LLT Sub Project... Quote:
I did play around with just the SVS subs and the SPL. I got them to 118db at max volume on my receiver. Funny thing is when I cut my sub pre-out up, my max volume reduces. Of course just sitting here thinking about it, the subs are only 1/4 volume, so I can turn them up too. They didn't flinch one teenie weenie bit at 118db though... they were doing well as far as I could tell. I turned on the behemoth and reached 125db on the same scenes at max volume. Man, it was loud! This little SBS-01 speakers didn't flinch either.... I was impressed at how loud they will play. I'll turn up the volume on the Plus/2's and see what else I can learn. | ||||
|
| | #160 (Link) | ||||||
| Re: Dual RL-p15 D2 LLT Sub Project... Wow, that's a nice and low tune I actually forgot you were going for a 13hz tune as opposed to something like 16hz in the other two dual RL-p15 LLTs (steve's and ryan's). After eliminating that dividing wall from your original design, what would you estimate the final effective volume came out to be? If you are using two 6" diameter ports that are 34" long with roundovers, I'm guessing ~575 liters. Whatever it was, it seems to have worked perfectly Quote:
Quote:
Quote:
![]() | ||||||
|
| | #161 (Link) | ||||
| Re: Dual RL-p15 D2 LLT Sub Project... Quote:
brucek | ||||
|
| | #162 (Link) | ||||
| Re: Dual RL-p15 D2 LLT Sub Project... Quote:
It's not useful to try to measure only the port's output either. Port's output will be attenuated heavily around 1/2 octave below and 1/2 octave above the tuning frequency (already around 5 dB down). Anywhere else driver's output will be much higher. Around an octave above the tuning the port doesn't contribute to the combined frequency response at all (more than 10 dB down). So in order to get an accurate measurement of port's output, one would need to mute the driver. And we all know what happens then...or should I say, what doesn't happen. ![]() In-room NF measurement is pretty tricky thing with sealed subs too. Almost every time some amount of room interaction is still being present and can be seen in the measured frequency response. One should understand that it's not easy to measure waves having wavelengths of several meters in small enclosed spaces. | ||||
|
| | #163 (Link) | |||||
| Re: Dual RL-p15 D2 LLT Sub Project... Quote:
Quote:
I usually unplug my mains when performing max SPL tests. It's so much easier to hear any noises of distress then. One can pretty much tell by ear when the subwoofers are about to hit their limits. Is your crossover at 80 Hz? | |||||
|
| | #164 (Link) | ||||
| | Re: Dual RL-p15 D2 LLT Sub Project... Quote:
Yes, my crossover is at 80Hz. I had the subs jacked up probably 20db or more above the mains on the last test I did... the bass was all over me, obviously way louder than the normal. Really it seems like no matter how hard I push those Plus/2's they don't flinch. Of course there may be some distortion there that I just don't realize I'm hearing. | ||||
|
| | #165 (Link) | |||||
| Re: Dual RL-p15 D2 LLT Sub Project... Quote:
Quote:
| |||||
|
| | #166 (Link) | ||||
| | Re: Dual RL-p15 D2 LLT Sub Project... I'll try out the LOTR "ring drop" scene. I don't have either of the other two. What range are the depth charges on U-571? What about the starship at the beginning of Star Wars III (or whatever that last DVD released was)? Jurassic Park III maybe... seems like those dinosaurs always knock me around a little bit. Quote:
| ||||
|
| | #167 (Link) | |||
| Re: Dual RL-p15 D2 LLT Sub Project... Just one guy's opinion, but I'd RENT M&C and FotP if you want to check out those bass scenes.....the films themselves are very hard to stomach, skip the purchase FotP is still the rotten apple among my dvd collection![]() | |||
|
| | #169 (Link) | |||
| Re: Dual RL-p15 D2 LLT Sub Project... I lost track of this thread for a while. I'm glad I found it again, it looks like you executed the design quite well. Quite a SUBstantial project, I'm envious. You will want to make sure your home owners insurance covers seismic damage. Throw a quilt (or 3) over the Behemoth when the adjuster shows up. The unfortunate thing is, what do you do for an encore? Paul | |||
|