haha - how does the midrange sound with pre-recorded music since we don't get that tidy bandpass high frequency rolloff? https://i.imgur.com/8QvqNI0.jpg
OFF
That' rolloff mostly due to simulation problems far from Fs/Fc.
Perform easy estimation. Horn have 1:2 opening, in simple case this provides +4-6 dB at mids in range 1-7 kHz. Lower we have good sensitivity rise due to high Q (~1,8-1,9 in 15 L) in low volume, higher we already have ~110 dB.
Insane ones can use bass reflex, in a 15 L we need like to 90 Hz tuning, in can be done by 100 mm diameter and 100 mm length pipe. Doing this will add another 6 dB at 150-180 Hz, where most of high-drums are and simultaneously keep displacement safe.
Green - optimum 68L + high damping (equal to ~150 L undamped) for Butterworth alignment
Yellow - 15 L sealed box without damping
Red - 15 L bass reflex with 90 Hz tuning.
Meanwhile somewhere in Sweden...
Not really the intended user case, just moved in to this place and I'm sure I'm not making any friends... even at very low levels it saturates the room with energy, walls vibrate and you feel it everywhere.
It does sounds good though, can't really say how much the room plays a part in that result but still, I have only heard it outside before and there are similarities to the sound and character.
Perhaps a nice layer of oil and a better looking wood would make a nice coffee table. Haha. One very known problem with home-audio is the wife-approval factor
fwiw ROAR15 vs smaller MMJ planar and ROAR15 attempt to compare to a little Karlson box
https://i.imgur.com/KBOrcZU.gif
https://i.imgur.com/hTgOUfF.gif
https://i.imgur.com/KBOrcZU.gif
https://i.imgur.com/hTgOUfF.gif
My son has been listening to everything from simple tapped pipes with Beyma 12LX60, tapped horns in many flavors and sizes, 218 BR boxes, THAM12 with B&C 12PS100, large OD-QW with Beyma 15K200 and Beyma SM115K and several different car audio drivers in a wide variety of boxes throughout the years. The one box that really impressed him is my ROAR12, and after reading about BesPavs experiences with his ROAR18 he just bought a RCF LF18X401. I am not really sure about the rational of letting my 15 year old son have a ROAR18 and a bridged QSC RMX1450 in his room. I am afraid we will have to rebuild portions of our house soon, but I could not resist his enthusiasm in building a fun and capable loudspeaker. He is going to use the ROAR18 as a home-theater sub.
Hmmm... Put it in the window as FOH system sub?
Too subtle for RCF beast, but indoors...
INDOORS? Are you speaking really?
Squeeze out intestines through ears...
We live just for our childrens, let him feel a success. All of his friends will be amazed. He will be welcome at any school/university party. Local DJs will stand inline for playing through ROAR.
Add something like DBX Driverack with Mackie SR1530 and you are ready for 500-800 guests.
Not so good for such a task. LFE channel contains a lot of ~10-30 Hz material and 30-Hz Fs driver needs a lot of power and EQ-ing. But indoors you could pick huge roomgain, may be, may be.
An externally hosted image should be here but it was not working when we last tested it.
There are two TPQWR tuned to 23 Hz being built in Sweden.
Two Beyma 12LX60-v1 in each box.
My 33 Hz ROAR-prototype is very powerful and overwhelming. I get quite scared by those 23 Hz monsters.
What are the latest news on the ROAR18? I never gotten around to build them. But I now have a smaller, thus more likely project coming up.
A single ROAR18 with a DR250 (BFM design) on top. It's a 12v system running on 2x 230ah batteries using a Hertz HDP4 amp. I'll make a custom wagon with two trailer wheels.
I'll use the Beyma 18PW1400Fe 4-ohm version, so I can get 500w from the amp, and I'll adjust the DR250 according to how loud the sub is. I'll cross at around 100hz maybe a bit higher if the Roar18 allow me
It is for garden parties, but primarily for a 7-day festival. Therefore I'll install a 250w solarpanel, so the beast can recharge during day. Obviously it won't blast full volume at all time, so it should be more than enough. Also the dynamic sound that music is made of enables me to divide the 500w + 100w (top) by 10 (A thumb-rule used by the 12v community in DK), so the average usage will be 60w. The 250w should be P L E N T Y
I am making a SketchUp file for the project, and I'll build the ROAR18 in it. Would you like a file with only the ROAR18 in it? So you can share it with DIY'ers who wanna build it?
A single ROAR18 with a DR250 (BFM design) on top. It's a 12v system running on 2x 230ah batteries using a Hertz HDP4 amp. I'll make a custom wagon with two trailer wheels.
I'll use the Beyma 18PW1400Fe 4-ohm version, so I can get 500w from the amp, and I'll adjust the DR250 according to how loud the sub is. I'll cross at around 100hz maybe a bit higher if the Roar18 allow me
It is for garden parties, but primarily for a 7-day festival. Therefore I'll install a 250w solarpanel, so the beast can recharge during day. Obviously it won't blast full volume at all time, so it should be more than enough. Also the dynamic sound that music is made of enables me to divide the 500w + 100w (top) by 10 (A thumb-rule used by the 12v community in DK), so the average usage will be 60w. The 250w should be P L E N T Y
I am making a SketchUp file for the project, and I'll build the ROAR18 in it. Would you like a file with only the ROAR18 in it? So you can share it with DIY'ers who wanna build it?
Yes! I would love to have a SketchUp file for the ROAR18. That would be very appreciated!
Not much is happening at the moment. We have a RCF LF18X401 waiting for a future ROAR18 build.
We have been exploring the TPQWR principle with some car audio drivers lately.
A single cheap 500 watt peak 12 inch car audio driver could take 2000 watts for a few seconds with only 10 mm p-p cone amplitude. The voice-coil got very hot very fast, but the amount of clean and powerful bass was staggering.
YouTube
Here my son is testing it outdoors with approximately 400 watts from a Tamp E800.
An externally hosted image should be here but it was not working when we last tested it.
My son bought a more powerful 15 inch car audio driver that is going into a TPQWR enclosure. It has a nice lowish Qts of 0,21, a very sturdy mechanical construction, a strong cone and seems quite suitable for the TPQWR.
Regards,
Johannes
Roar 18, 15 and 12 in the same file. No handles, ports or so, but does have front-fabric.
Roar series.skp - Google Drive
Here is three different measurements of my ROAR12.
The green line is with my ROAR12 in my car and the Umik microphone at the dashboard above the steering wheel.
The purple line is outdoors with the ROAR12 standing against our house and the microphone 2,5 meters out on our lawn.
The blue line is indoors, standing in the middle of our 25 m2 large attic room with the microphone 50 cm from the mouth of the ROAR12.
No smoothing.
A ROAR12 in a car with all the cabin gain is a quite brutal beast.