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OB_newbieCardboard cc was the first material I used I believe,I could get my hands on all sorts for free at the place I worked at the time,the thinnest was 3mm approx ,this was my favourite.The main problem with cc was the it sounded like cardboard ,also the sound would travel along the flutes but be blocked going across them ,a bit like the wave breakers that you see at the beach,adding shellac just makes the panel heavier and makes things worse,although I do remember coating the exciter side and noting it helped the sound spread across the back of the panel,coating both sides over damped it,to my ears anyway.Luckily I discovered eps which is still my favourite ,so far.I'm afraid I'm going to be showing another couple of panels soon ,one of them my new ply panel and maybe my other harder type panel,if all goes well.Steve
OB_NEWBIEHave also pulled out an old eps panel from the loft,an odd shaped one but I haven't thinned the front area ,so could take some measurements then do some thinning and so forth,I now have too many panels to work on at one time,5 in all As for EQing panels ,I'm trying to make panels that do not need EQing or very little at most,so if we could have the measurements without EQ it would be very helpful.These last few weeks or so have opened my eyes about the way hard and heavy panels differ from the lighter eps types ,they both need different mounting to produce their best.Hopefully if all the tests go well I will post the results,just not 100percent sure yet!Steve
I thought I had it made with the response within a 5db band from 100hz to above 10k and only one or two db down at about 16k ,so I use measurements only as a guideline,but they can show up bad faults in panels that are less than ideal.Happy New year all.Steve
OsssyvanHi Just a few questions.What was the distance of the Mic.Is the scale in 5db increments,it's a bit hard to see.What exciter was used and how was it mounted.Did you think the sound changed much between sizes and exciter positions.Thanks for sharing.Steve
Back home from the Holidays and a big box filled with exciters from my latest order awaited me at home! The new year couldn't have started better. Happy new year everyone!
Interestingly there is still the dip in 8-11k region and cutting the panels seemed to affect the LF surprisingly little.
there is an interesting company site called soundRight.Org.UK they have some nice looking panels for pro work and cardioid subs for PA ,they measure using swept tone and gated pink noise ,there is also some technical papers of interest for panels and subs,also interesting placements for good spread of LF.There seem to be more stuff out there every time I look.Steve
ExspecI presume that you will be able to have all the panels out from the walls 3to4ft?If the exciters are the same 10watt cheapo exciters I bought some years ago they will be fine with eps and xps and probably ply.If ply is used they will be struggling with the movie LF below 50HZ ,so xo above this.Small poly type panels could also work for smaller rooms but more powerful subs would be needed ,and capable of a good quality of sound up to match the panels xo.Steve