Emile Posted November 20, 2018 Author Share Posted November 20, 2018 11 minutes ago, Chris A said: So I'd guess that you have a miniDSP 2x4 issue. I recommend turning the input gain down from the preamp, and turning the power amplifier gain up 11 minutes ago, Chris A said: I'd also check all of your connections, particularly the RCA Chris; great thanks again. Never thought about possible clipping ... but that may just be the "ripped woofer" sound I am hearing Trying it shortly. Thanks! Connections have been double checked ... and switched to "better" RCA cables after my initial tests. 11 minutes ago, Chris A said: could be as simple as the K-510/K-693 that you're playing with is not mounted in a baffle, so you're losing a dB or two You DA MAN. Yes; "old" one is on a baffle in an approx 11x19x9" box, so that explains that one Add-on ... and yes, I'm an idiot ... balance knob was off also 1 Quote Link to comment Share on other sites More sharing options...
Emile Posted November 20, 2018 Author Share Posted November 20, 2018 @Chris A ... Dear Professor, THANK YOU DOCTOR Yes; "clipping." (Turned the pre-amp gain down and the sound is crystal clear. Stupid ... but guess I had never really heard "clipping.: Maybe I'll cut out the pre-amp and just go "straight" ??? So; do you suggest getting the "better" miniDSP (the HD version) or ?? Haha, know you are partial to the Xilica's, but was just playing with this and not ready to spend those kind of $$ for this (Plus, lost about 200 of these Xilica's in the market during the last few weeks ) Thanks again, Emile Quote Link to comment Share on other sites More sharing options...
Emile Posted November 20, 2018 Author Share Posted November 20, 2018 36 minutes ago, Dave A said: I thought so and it is an easy way to test with known good components. Have you checked the driver itself with a sweep generator and ohms? Switched one "bad" driver (just the driver and not the horn) to the good 904 to see what happens? If you have a driver problem all the good advice you are getting still won't fix that. Dave, THANKS! Yes, swapped "one" and it was "good." Chris diagnosed my problem as miniDSP clipping Thanks, Emile Quote Link to comment Share on other sites More sharing options...
Chris A Posted November 20, 2018 Share Posted November 20, 2018 I'd only recommend a miniDSP upgrade if you are still dissatisfied after you dial it in a bit more. The lack of gain latitude is apparently the issue with the 2x4, that, and the tendency of the unit to be a bit sensitive to power supply noise issues. Many people on the diyAudio forum find the2x4's to be useful. I haven't heard any issues with the 2x4 HDs--they seem to have everything nailed down pretty well Chris 1 Quote Link to comment Share on other sites More sharing options...
Emile Posted November 20, 2018 Author Share Posted November 20, 2018 2 minutes ago, Chris A said: I'd only recommend a miniDSP upgrade if you are still dissatisfied after you dial it in a bit more. Thanks for saving me some money Will be dialing it in a bit more Quote Link to comment Share on other sites More sharing options...
babadono Posted November 20, 2018 Share Posted November 20, 2018 Glad to hear you're getting this nailed down. Gain structure and adjustments can be tricky, especially without an oscilloscope. I did not know the mini dsp was so finicky. My "how much?" post earlier was in jest, I knew between Chris and you you would get it dialed in. Some people are too serious Perhaps I'll go back and edit my post with a smiley face. 2 Quote Link to comment Share on other sites More sharing options...
Emile Posted November 20, 2018 Author Share Posted November 20, 2018 41 minutes ago, babadono said: My "how much?" post earlier was in jest, Haha ... I was almost ready to sell it cheap 1 1 Quote Link to comment Share on other sites More sharing options...
AHall Posted November 21, 2018 Share Posted November 21, 2018 I’ll buy those horns if you wanna sell em. 1 1 Quote Link to comment Share on other sites More sharing options...
Emile Posted November 21, 2018 Author Share Posted November 21, 2018 13 hours ago, AHall said: I’ll buy those horns if you wanna sell em. Haha long line Just got them working ... going to keep them for a while. 1 Quote Link to comment Share on other sites More sharing options...
Dave A Posted November 21, 2018 Share Posted November 21, 2018 I won't take you up on your offer to sell the horns under the condition you order some for me at your preferred buyer price. Just the horns I have drivers. 1 Quote Link to comment Share on other sites More sharing options...
Khornukopia Posted November 21, 2018 Share Posted November 21, 2018 20 minutes ago, Emile said: Just got them working Good to see that. Could get even better when you fine tune your miniDSP settings. 1 Quote Link to comment Share on other sites More sharing options...
babadono Posted November 21, 2018 Share Posted November 21, 2018 1 hour ago, Dave A said: I won't take you up on your offer to sell the horns under the condition you order some for me at your preferred buyer price. Just the horns I have drivers. Another long line 2 Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted November 21, 2018 Share Posted November 21, 2018 A question that may or may not have been addressed already. The drivers and horns in the 396 have a passive network with no active eq. Why does everyone seem to think his set up needs eq? 3 Quote Link to comment Share on other sites More sharing options...
Chris A Posted November 21, 2018 Share Posted November 21, 2018 The settings that I posted were for the K-691 driver on a K-402 horn, simplified to yield four PEQs. All controlled directivity horns/compression drivers need EQ in mid-band, like is shown above. IOW: check your KPT-396s with and without crossovers. You might be surprised by what you find (i.e., passive attenuating--usually notch--filters are in there somewhere). Chris 1 Quote Link to comment Share on other sites More sharing options...
babadono Posted November 21, 2018 Share Posted November 21, 2018 Chris beat me to it. It is a CD horn. There must be some filtering in the network. Got a schematic of the passive? Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted November 21, 2018 Share Posted November 21, 2018 7 minutes ago, babadono said: Got a schematic of the passive? No and I haven't ever pulled mine out. Quote Link to comment Share on other sites More sharing options...
babadono Posted November 21, 2018 Share Posted November 21, 2018 Just now, CECAA850 said: No and I haven't ever pulled mine out. And there is no need to Those speaks are awesome. Just plug and BLOW! 1 Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted November 21, 2018 Share Posted November 21, 2018 2 minutes ago, babadono said: And there is no need to Those speaks are awesome. Just plug and BLOW! I'm thinking about future projects here. Idle hands, blah blah blah. LOL. Like I don't have enough already. 1 Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted November 21, 2018 Share Posted November 21, 2018 24 minutes ago, Chris A said: passive attenuating--usually notch--filters are in there somewhere Thanks Chris, I didn't know that. I had imagined a simple crossover with components for limiting driver high/low pass frequencies only. 1 Quote Link to comment Share on other sites More sharing options...
Chris A Posted November 21, 2018 Share Posted November 21, 2018 If you ever have your KPT-396s open and can read the values on the discrete components and how the components are hooked together, you can reverse engineer what Roy, et al., did using a freeware tool called Xsim to show you the frequency response/phase/input impedance of what's going on, and you can connect-disconnect each component to understand what it's doing. No real hand filter calculations are required--all thanks to Bill Waslo (a.k.a., Liberty Instruments), a great guy that sometimes visits here. You can find him over at diyAudio under the name bwaslo, Chris 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.