Jump to content

EHT007

Member
  • Posts

    343
  • Joined

  • Last visited

Everything posted by EHT007

  1. Another change to Helmholtz was addition of polyurethane foam in the ports! I found publication on scientific report that was published recently and they talk about addition of polyurethane around neck of the ports increase bandwidth by large amount. The resonator did demonstrate much wider bandwidth when striking the box, however it was very little change to Frequency response. What I have observed was the decay RT30 was much smoother!! Reference: https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.nature.com/articles/s41598-019-49222-w&ved=2ahUKEwjA2-_9rY_yAhWDj-YKHTM3DTQQFjAAegQIAxAC&usg=AOvVaw08_OGCbzdnj8L1m0l3P1P9
  2. Membrane absorber. Silicone the front panel with membrane. Mass loaded vinyl is *****, when you try to pull and staple by your self. Second one I've done was much easier I put no more nails over the frame and placed it down on vinyl with 60kg of weigh on top. Seems to have worked ok.
  3. Yay Weekend. I've got few different ideas, i want to try tackle the 61hz peak. I might make two membrane type absorbers one for 45hz and the other for 61hz. Here is a Giff of before and after measurement is with Left + Right + Sub . Presets Time Range 300ms SPL Scale 100 top 50 bottom, Left 15 right 300hz Smoothing 1/48
  4. So im going to try build LIMP trap with 4kg membrane this is to make the box more compact as the corner is limited with available space. I've drawn up a Jig to assist me with precision, and visual appearance bolts in-line.. Going to 3d print 4 of these bad boys.
  5. Here is a pic a posted on another thread. Im tempted to try drill it out for 45hz. I think another 51mm hole would get me there. Blue line is with HR in place. Definitely need a second HR.
  6. Comparison is made to previous treated room, vs my diy HR and few 75mm acoustic batts. Currently its tuned to 42hz, i think if i try get 43hz it will be even bigger result. I need to post these on my diy post Right Speaker Left Speaker
  7. Helmholtz-Resonator is your solution to 33hz issue for under 200$ if you have compound saw, and hole saw. Same box, different port sizes, you can see different port sizes tuned for different frequencies. I just finished my project yesterday, and it works so damn good that for the first time ive head my Strads produce bass in main seat position and not in my bedroom.
  8. Yeah I think this is just polyester, no nasties. Bradford polymax acoustic. https://www.insulwest.com.au/
  9. As I'm sitting here writing, I'm just listening bit of viking drum music, no subs. And O M F G.. my strads got bass now !!!
  10. Also made 2 new bass traps. 3x 75mm polyester inside enclosure 19mm pine with 12mm plywood back. I can place 4kg mass loaded vinyl on front to get better effect but will experiment at later time. I actually place one behind curtains and it made big difference. This was going to be the lid but I just left it behind curtain.
  11. New design. this kicks ass. I've focused it on 42hz. I need to make it 44hz but wow. Trend is new resonator vs old design. Without the HR I get massive peaks and nulls. Still working on positioning. I really need 2nd box. As both speakers love it. But one positioning doesn't suit both speakers.
  12. In progress. She can pick the fabric colour. Hahah that's gold!
  13. * Very low reflections * Not very comfortable, higher engagement with listening experience. * No falling asleep and having tubes unnecessary for 5 hours. *Cheap 60$ vs 6k+ that I have no space for now. Only downside I see is wifefactor issues. I told her it's temporary.
  14. Based on the room size you mentioned earlier week or so a go. This simulation looks very close to your measurements, without knowing your listening position distance from speakers. Its easy just to move around the head and see how the curve changes. Wish it was this simple for my room.
  15. @crtexcnndrm99 as for diffusers this seems easy enough. http://arqen.com/sound-diffusers/ I'll probably just end up buying some. Unless I get a cnc router. I like consistency, and I can get by in Fusion 3d. Then something like this is easy to make. However, my design would have no r&d. Unless I buy one panel, laser scan, remodel and cnc. But that's naughty.
  16. Great thing about measurements is it rules out the placebo effect especially when you spent half day marking up and drilling holes whilst selling a story to your self... this will be amazing. 80hz range was on my radar to fix. And you could clearly tell without measurements 8db improvement. However it would be very hard for me to pick up all the issues across other frequencies without measurements and you can't go back and test a/b. Strangely enough the other way I fix 80hz dip is by leaving front door of the house open! Haha that's funny about your rel, there must be some science behind our madness.
  17. Yeah Dave is very right try different position. Last week I actually repositioned sub behind rack in the middle. I took a measurements, I'll try find tomorrow... You would not believe the difference. You just couldn't hear it. I tried adjusting phase. No go. Within an hour I had my gf giving me hand trying to place it back where it used to be. Lucky I had market it with tape. Currently it's in a corner behind front right speaker firing at 45 degree towards side wall. I couldn't try any other positions as my rca is way too short. But I'm happy with results.
  18. More toys to play with. 500$ spent of materials so far and 330$ on tools.
  19. I said that to my GF, I thus doesn't work out. It's not going to waste. I place RGB floodlight inside. https://youtu.be/sn6jNFzgAWY
  20. Moving it around makes a lot of difference. I havent tired upwards or backwards since i drilled more holes but ill give it crack this weekend and ill post the results. Do you run subs ? That was my issues Strads produce bit of bass, just 0 in listening position. Addition of a sub has fixed that completely. All of my issues are main speakers related. i've got a few bits on order, over the weekend ill make a perforated helmholtz, and ill give a membrane a go as well. On positive note this project is keeping out of the classifieds page.
  21. Just placed without measurements ? From my recent experience, its very easy to upset the balance with just one sub set at incorrect phase. I assume two is a whole different kettle of fish. Previous to my hifi journey. I owned KRK studio monitors and matching high output sub, this was just a party trick SPL monster. I had it off 80% of time just didn't have the right balance. I didnt even know what the phase knob was, i would turn it and go ya nah no difference while sitting on the sub. lol. Now if something sounds bad, i go check to make sure sub isnt off haha. I assume majority of bad experiences from owners using subs might be due to poor integration. ( i could be wrong )
  22. This is poo. No sugar coating here. I think its back to the drawing boards, it fixes some issues but creates others. Plus other issues in midrange, it might be to do with lots little holes, or to maybe new reflections introduced by the big cabinet. On weekend ill run a string based on some new ETC spikes. Here is the sub with no EQ on minidsp. There is big peak at 46hz and i have PEQ on -12db on that set on back of the sub. HR seems to suck life out still at 54hz even though the opening is now over 1200cm2. Got few different ideas going forwards. 1) build enclosure within the box lid for the 110holes in the middle section and aim for high frequency resonator. Down side the position of the cabinet where i get most SPL at low hertz and not 117hz that i would like to treat. 2) Create two smaller cabinets from single. I've noticed the left and right speakers do respond well at different locations. So more of these is on cards for sure. 3) 3d print ports to insert into slots and hopefully i can bring this down to 46hz and might allow me to turn off PEQ. Trial and error and best part. This is fun except for the part of cleaning all the mdf dust. I want to get table saw and table router for some future works.
  23. I was going to suggest this yesterday. But I figured it might be easier to invite him over to have a listen to my Strads with subs and without. There is no going back lol.
  24. Hm you sweep lenght is 4M, i use 256k, see @frednork uses 1m maybe try that too. From what i recall longer sweeps more ideal for measuring sub's for waterfall and ****.
×
×
  • Create New...
To Top