Originally posted by mortron
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Yeah I have to admit that the idea of going quad is firmly rooted in active realm. Once I got the MTM playing nice and decide to employ a passive WM crossover I would have to go to two drivers per side.
I could likely find use for the other 8's if need be ;)
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mortron, You're using efficiency and sensitivity interchangeably, and they are not the same thing. Efficiency is based on power at 1W, normally specified as a percentage. Sensitivity is based on a voltage of 2.83V, and normally specified as a decibel output level. Since drivers are voltage sensitive devices, and not power based, and everything can be based upon the 2.83V specification regardless of impedance rating, then sensitivity is what you should be using for output and simulations. The Neo3PDR has a sensitivity of 90.5dB. This is not it's efficiency.
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My bad Wolf... And the worst thing is that I know bettwr than to confuse them!
Apologies.
I am glad I started this thread, it has really helped with my research and where I need to shore up and what I may find a challenge as things progress.
But yes... Neo 3PDR is 90.5db... so that may change things. For some reason I rhoughtit the other model with higher efficiency. These came from Danny at GR Research about 3-4 yrs ago.
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The mtm sensitiviy will be determined by the mid-ranges. So, after BSC, the sensitivity will be about 86dB. The tweeter will need to be padded to match. The level between mid-ranges, and woofers, is matched with the active x-over gain adjustments.
Maybe I missed something else. Why are you concerned about the Neo3 sensitivity?
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Originally posted by mortron View PostWas just concerned the mids would have too much output for the 90.5db tweeter.
You may be able to play the tweeter without padding. It probably limits how low you can XO as you'll lose acoustic output.
It depends on the target slope you are planning (or flat response). I did an excursion modeling spreadsheet that takes 3 drivers so you can work out which one will "xmax first". Can't find it now
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Originally posted by mortron View PostWas just concerned the mids would have too much output for the 90.5db tweeter.
Is this the correct data?
https://www.parts-express.com/pedocs...ions-44576.pdf
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I have always been extremely happy with many SB acoustics products, peerless is also good.
For subs I would look very closely at the dayton RSS HF line. They perform about 90% as
good as anything out there in my opinion.Guess xmax's age.
My guess: 15. His grammar is passable. His trolling is good.
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I hate this tweeter... Aspects of it I love, others I hate. They were a gift though, so I have em.
Maybe I just say to hell with it and make a TMW.
Or I pull up my pants and find a different tweeter.
I have been quite busy and haven't had a chance to run any sims yet. I'd like to find a used windows PC so I can run progtamsa bit easier. Wine doesn't seem to do much for me, may have to try again. Mac's are great until you need a PC only program.
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I do not think you will have a sensitivity issue using your Neo3PDR with a pair of 830-991 woofers in parallel. I just completed the crossover design and voicing of my project using a XT25TG and a pair of 830-991's. On a 6.75" wide baffle I still had to pad down the XT25TG over 3dB. Looking at the manufacturer's plots for the two tweeters it looks like the Neo3PDR is more sensitive. Grant it I am running my 830-991'a as mid-woofers so I have a full 6 dB of baffle step loss, whereas you will be crossing them over higher and have less baffle step loss to compensate for. Still I think there is plenty of sensitivity to spare. Here are the two manufacturers' plots:Craig
I drive way too fast to worry about cholesterol.
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Originally posted by mortron View PostI hate this tweeter... Aspects of it I love, others I hate. They were a gift though, so I have em.
Maybe I just say to hell with it and make a TMW.
Or I pull up my pants and find a different tweeter.
I have been quite busy and haven't had a chance to run any sims yet. I'd like to find a used windows PC so I can run progtamsa bit easier. Wine doesn't seem to do much for me, may have to try again. Mac's are great until you need a PC only program.
Also, how close to the wall do you plan to put the speakers, and how forward, or laid back, do you like your music?
The baffle response I posted made me think that it might be hard to shave off 5 or 6dB. If you add a passive high-pass filter, and possibly some padding, I'm sure it will work.
How soon could you make a test setup for the tweeter, and measure it?
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