thanks jan did you even test opa2107 ?

Than Thanks FredA You are always responsive, kind and informative I really appreciate that Yep, you are right, for dc servo opamp must be fast and low dc offset exist in inputs , as I know (correct me if I am wrong) So, kingwa use opa2134 which slewrate is 20v/us and dc offset typically is...

Hi I want rolling dc servo opamps in master 7 and master 1 I have opa2132, opa2107, lm4562, lme 49860 opamps to test My favorite one is opa2107 , that is difet , simillar to opa627 and sound very rich But I have a question M7 is connected to M1 by ACSS connection So does it matter to change...

hi again measurements for NFB28 (green line) and Master 7 (red line) is attached so as you see M7 response fall at 14khz about 40db as a chance, one measurement of M7 lead to response similar to NFB28 ( I attach its graph as Master7 OK) so what do you think? I think a strange things happens and...

yes, I use UMM6 with REW software and introduce calibration file of mic to REW, then unplug right speaker and measurements done on mono mode of left speaker I will upload measurement files as soon as I have access to measurement files speaker components are Oris150 horn with tangband full range...

original M7 dsp board

I did not upgrade M7 digital board to S7 , only firmware is updated, I doesn't notice cold or warmed DAC start issue, probably due to that doesn't know this problem exists till now but I experienced problem from cold start and only one time M7 response Match NFB28 in high frequency region ( in...

I never understand which DSP mode is ( audio gd site info is confusing) but, jumper is on bypass situation , I think it is kingwa's default configuration older versions of M7 doesn't support NOS mode as I know probably it would be better to find a digital scope to test RCA and XLR out put I...

dear FredA I know that but I think it doesnt related to frequency response , correct me if I'm wrong any way I repeat mesearements after couple of hours to ensure M7 warm up enough

thanks aljordan for your help yes, I measure M7 and swap to NFB28 with out changing anything including Mic position I use M1 as pre amp and attach NFB28 to M1 input to ensure that problem is not from M1 did you use digital oscope to catch above graph? unfortunately I have an old analog scope and...

about 10 db from 14khz to 20khz also mention that I connect to M7 via USB yep, you're correct about measurement but with nfb28 high frequency response looks ok I will attach Measurement Pictures of M7 and NFB28 as soon as I can ( now my wife is sleeping :D )

I was googling for above mentioned problem and hope to find any solution, and lead me to your post I also have this problem randomly my M7 sounds ok but occasionally mids sound bad and loss in high is obvious so tend me to buy measurement mic for measurements so did you solve your problem?

hi all I recently measure my speaker response with dayton audio UMM-6 Mic and REW software and find out a problem with master 7 connected my response fall steeply above 14.3khz I checked response with NFB-28 and all things are ok I own older version of master 7 and firmware updated to last...

Thanks DACLadder for your reply I hope that I can offer it, I become so sad if deadline is met. Edit: I email to kingwa and fortunately it is possible to order yet

Hi all I want to know that , can I offer singularity digital board yet or this upgrade is ended by kingwa? Is it easy to upgrade? Stable or have compatibility issues with M7 that needs tricks to get rid of? And at the end how much does it cost excluding shipping cost? Tanx in advance