If you either really fall in love with the Pluvias, or find this doesn't quite turn out as hoped and want to repurpose some of them , you might want to look at a design that I very much like, and consider underappreciated - the Planet10 micro-tower. I've built 3 pairs of the bipole version with top mounted driver, and particularly like them with the top driver tilted forward at 10dg. - per the options shown on page 4 of the plan set.
http://frugal-phile.com/boxlib/P10free/microTower-maps-020615.pdf
http://frugal-phile.com/boxlib/P10free/microTower-maps-020615.pdf
Isobaric always seems like such a waste of drivers to me unless you absolutely need to reduce the box volume to a very small amount. Push pull slot loading seems to work quite well for some drivers. There is a thread about them in the subwoofers forum.
The 8C commercial studio monitor from Dutch and Dutch is using two 8" subs on the rear of the cabinet to fire at the wall and they are claiming it works well right near the wall. Measurements look good, might be worth looking at, lots of DSP at work though.
post from one of the designers with some information relevant here http://www.diyaudio.com/forums/multi-way/192737-2-way-waveguide-cardioid-like-17.html#post5048852
wish he'd called the 4 driver version something else
Good point Chris - maybe the name put off potential builders?
Well, Dave did offer an alternative design with 4 drivers:
http://www.diyaudio.com/forums/full...bipolar-ml-tl-chr-70-el70-31.html#post2643920
I really like the Pluvia's midrange and top-end. It's not too 'shouty'. But after some 'break-in' period they do seem to lose some of the upper frequencies and favor the lower notes.
Right now I'm experimenting with MTM, i.e. 2 stacked FR Pluvia's with an 4-ohm AMT tweeter in the middle and everything is wired in parallel. The only crossover I have so far is a 2uF polyester cap in series with the AMT65-4.
All the lower frequencies are gone from the lobing effect, which is fine at this point. After I build 2 more boxes for 2 more Pluvia's, I'll test a MMTMM setup for L & R channels. The endgoal now seems to be a WMMTMMW setup with 8" SB Acoustics woofers crossed over in the sub 200Hz range. We'll see after the MMTMM experiment.
I am far gone from point source... However, I still have the 4x BK12m enclosures and 4x FE126En, and 4x Vifas to remind me how I got here.
Right now I'm experimenting with MTM, i.e. 2 stacked FR Pluvia's with an 4-ohm AMT tweeter in the middle and everything is wired in parallel. The only crossover I have so far is a 2uF polyester cap in series with the AMT65-4.
All the lower frequencies are gone from the lobing effect, which is fine at this point. After I build 2 more boxes for 2 more Pluvia's, I'll test a MMTMM setup for L & R channels. The endgoal now seems to be a WMMTMMW setup with 8" SB Acoustics woofers crossed over in the sub 200Hz range. We'll see after the MMTMM experiment.
I am far gone from point source... However, I still have the 4x BK12m enclosures and 4x FE126En, and 4x Vifas to remind me how I got here.
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Did I mention I favor cymbal reproduction?... Listening to Celtic Frost: To Mega Therion is loaded with cymbals, french horns, and distorted guitar. Distorted guitar? Take the good with the bad I guess. Sounds freakin awesome.... Still trying to find an offensive album that hurts my ears in the mids.
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Do you have Slayer's "Seasons in the Abyss"?
"War Ensemble" should be a good work out...I do...
I'm about to enjoy these.... Today I put them in the garage, slightly different angles on the Pluvia's before I brought them back inside for a comparison test. Slightly improved lower FRn in both rooms. More work is needed. Comb filtering is more evident in the sub 1kHz region.
I'm about to enjoy these.... Today I put them in the garage, slightly different angles on the Pluvia's before I brought them back inside for a comparison test. Slightly improved lower FRn in both rooms. More work is needed. Comb filtering is more evident in the sub 1kHz region.
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Thanks for contributing Dave! But why is it that's the region where I hear the most difference when comparing one speaker to 2 stacked boxes?
And what about this idea: Instead of a vent in the back, put another Pluvia 7 out of phase. Maybe a small vent in the side? Maybe sealed? Would love to get an expert opinion, as I am ready to experiment and replace my old Infinity RS5's with something much better.
And what about this idea: Instead of a vent in the back, put another Pluvia 7 out of phase. Maybe a small vent in the side? Maybe sealed? Would love to get an expert opinion, as I am ready to experiment and replace my old Infinity RS5's with something much better.
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If the Centre-to-centre distance is less than a ¼ wavelength then the 2 drivers are essentially coincident. Combing starts when the c-c is much greater than that.
http://p10hifi.net/TLS/downloads/taylor-line-array.pdf
dave
http://p10hifi.net/TLS/downloads/taylor-line-array.pdf
dave
What you have built in the last images is an MTM configuration, might pay you to read information from D'Appolitto or other's on that arrangement to give you some insight.
You also have the tweeter forward of the woofers and the woofers angled, so you will be changing the interaction between them. Usually the tweeter needs to further back to time align better. Perhaps you could build a waveguide type fitting to put the tweeter in putting it further back and lining up better with the acoustic centres of your full ranges.
At the very least putting the tweeter on a small baffle in between the full range cabinets and having them all point in the same direction would probably give you a better result.
You also have the tweeter forward of the woofers and the woofers angled, so you will be changing the interaction between them. Usually the tweeter needs to further back to time align better. Perhaps you could build a waveguide type fitting to put the tweeter in putting it further back and lining up better with the acoustic centres of your full ranges.
At the very least putting the tweeter on a small baffle in between the full range cabinets and having them all point in the same direction would probably give you a better result.
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