This is going to be a long post.
Where should I start.
I commented in one of your videos and you replied – told me to actually post here my idea and here I am.
As a whole I think this is a mega project for me because I have read a lot for less than 30 days on building a speaker with all the modeling and calculations which led to the idea of making my vision come true but I am confused on so many things that are over in this topic of speakers as a whole.
To start with a little background:
I have seen many speakers and some of them have a special place in my hearth. But they cost around 5K starting point per speaker and the amps are also in the spot. A friend of mine has some klipschs with 2 10inch woofers and Mirages om-7 or 5 don’t remember but with a stereo luxman amp worth back in the days arond 5K$ for music and normal a/v reciver for home cinema. Personally I think both of the speakers sound massive on both amps. My parents have focals 7.1 utopia series, polk audio some old school towers and so on but when I listen to all of them in the end for me they are all good, i don’t search for imperfections or differences in sounding – just listening to music through them makes me happy .
And yet their price point is not in the cheap range at all. And then there you are making really high quality videos which actually are educational and interesting. Showing that for 500-1000 bucks you can make a speaker up to par with speakers from 5k to 10k price range. There is this other guy from GR research that exposes them in many ways.
My idea is to make the “perfect” speaker from my point of view. I would like to know how much are we ripped of from marketing and labeling of parts with catchy names to sell when our ears are limited to hearing capabilities.
I want clearly to mention that everything bellow written is purely from deep searches and on simulations so when completed it may be totally different story. I really want to do this so I was like lets make a floor standing full tower speaker that will stand out and that incorporates all good things in speaker building for sound quality, with little cabinet vibrations, good dampening, good speakers, crossovers etc.
Step One – The Design
Just a rectangular box super simple nothing fancy like your build on the uglies. Drivers were a nightmare to chose from with all that data but in the end my mind stopped on entirely linearity in frequency response. All driver types will be Dayton Audio. I want 4 woofers in a vented tuned slot port enclosure, 1 mid range and 1 tweeter *MTM* design also in thought.
Step Two – Calculations
As i said those are rough and results may vary.
Outer dimensions: H 1300mm / W 300mm / L 650mm. At least 25mm MDF / HDF in consideration.
3 way vented Design
For the LF – 4 x Dayton Audio RS180 7inch 8 ohm paper woofer 60 watts rms
For the MF – 1 x Dayton Audio RS100P-8 4″ Reference Paper Midwoofer 8 Ohm 30 watts rms
For the HF -1 x Dayton Audio DC28F-8 1-1/8″ Silk Dome Tweeter 8 Ohm 50 watts rms
1 vented and 1 sealed enclosure. Vented 100-140 liters in volume. Sealed 10-30 liters.
I have the Winisd file and will try to attach it here as also the response graphs and Xsim crossover files needed to virtualize the project. The images are for the custom crossover network and the data from winisd.
1. Main question is whether the simulations are ok and if so is it actually gonna perform as seen on paper?
2. Given the data and my calculations in this set up the crossover is parallel so what will be total speaker power and impedance?
3. Do I need stuffing and sound dampening inside the box?
3. Will they perform and sound good as on paper and simulations?
4. Will they be up to par with luxury speakers and so on
To me the calculations looked good almost perfect to an extend as it is said by the books.
Port velocity is 11 meters per seconds.
Computed response from 20 to 200 hz has its natural roll of and from 200 hz to 20khz is almost dead flat with minor + – 1.5db deviation from 85dbSPL
Still simulated -3db at 35Hz and i was like wow if we add my room which is really acoustic with no echo or reverb similar to studio environment to the equation they would sound to me true full range and extremely flat for a passive speaker.
This looks too good to be true.
So its building time like how hard can it be and then this comes to my mind. If i build them and give them some power will they play and not break. Searched more and found this thing bout Xmax.
You mentioned Xmax in one clip and i checked mine – 6mm as stated so added 240 watts in winisd to see at nominal rms how would they perform and Xmax was of the charts – problem.
Then I added a high pass 4th order filter at 24Hz because i thought Xmax was more because of me wanting them to play 35hz and bellow – those speakers are 7inch bass mid woofers with great response and not actual subwoofers or subsonic capable.
But yet again nothing Xmax is of the charts and looks like twice than listed Xmax. So I thought something is not ok. Power was reduced from 240 to 60 watts and everything looks good now.
Does WinIsd actualy take into account the number of drivers because it seems to me that the power calculation and Xmax is data shown only for one driver because with subsonic filter and rms power of one driver the graph looks good.
Sorry for the long post. I am happy for what i have done so far but I need honest opinion and guidance.