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About nzlowie

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  1. Quick question, have ordered bipolar electrolitic caps to try as they're cheap and readily available.... To get better caps at an affordable price are the large motor run film caps a suitable option? Just thinking that as the QP covers some of the critical vocal range I don't want to insert anything that may degrade what we already have. Sent from my Moto G (4) using Tapatalk
  2. Been thinking about subs and then remembered how Troels Gravesen discribed the DTQWT'S that I'd already built and love..... he said they were a 2 way speaker with inbuilt sub woofer, this being the 2x horn loaded driver's. No need to build sub, already got them! Put them next the the QP horns tonight and used the minidsp with amp to drive them under 50hz. WOW! That's what's been missing..... Just ordered some caps for the Hi pass on the QP then I'll play and tweak the sub amp. Done!!!! Thanks for your help along this sometimes painful journey. Sent from my SM-T800 using Tapatalk
  3. Signal path was: Rpi with hifiberry digi+ feeding a Klien DAC (Australian). This then feed a Weston Topaz amp (Australian) driving the mid horn and a class D amp driving the bass horn. Tried manyyyyy different settings but each time I went back to a simple passive xover the sound stage and imagery just opened up. (Same amp) Sure you could get the minidsp system to measure better but it never sounded as good as passive, no matter what xover or filter settings were used. Compressed sound stage, it was there just not as wide or as deep as with a passive xover. Once I gave up on the minidsp and spent time sorting out the passive xover it really came alive. To my mind the minidsp is a budget piece of kit, can't expect it to perform miracles. I know others think they're great but not me. Also got sick of people telling me it must be the way I set it up, it was almost like I was a blass femer for questioning it's capabilities! Anyway, very happy with most of the system now. Get a sub and hi pass the QP horn and that will be it! Of the system's I've heard lately the only one that betters my was a hi end ML, Accuphase and​ Bakoon system. Having said that if I get a bit more lower bass mine will kill it on rock music. Sent from my Moto G (4) using Tapatalk
  4. Thanks Claude, that will do the job nicely.... As this will be placed flat against the front wall between the main horns is it ok to change the opening from being on the side to the front? Same distance from the end just moved 90deg. Sent from my Moto G (4) using Tapatalk
  5. Bruce, not going to put minidsp back in the mid/tweet section. Tried minidsp early on in this project, just kills sound stage and imagery. Not going to happen! The delay induced by the minidsp on the bass horn is an unwanted side effect of needing it for EQ. Sound quality without minidsp is just beautiful, only thinking about it to chop the lowest octave that the horn can't produce. Or go passive..... If the team think the massive amount of capacitance needed won't affect sq too much. Sent from my Moto G (4) using Tapatalk
  6. Update time... A few posts ago I mentioned that I tried running the quarter pie standing up. Well, revisited this and WOW very happy! The reason I revisited this was I had a weakness in the mid bass area, not in measurements but "punch" or "attach". The FR was there but without impact. My thoughts were that as the upper end of the QP horn was probably becoming directional it was "getting to me". I only sit a few meters back from the horns and I think the mid bass just hugs the floor, standing them up points them directly at me. The other benefit I was looking for was a flatter response, with the QP standing up the in room response was pretty flat from 50hz to 1khz. This meant I could just have a passive xover and eliminate the minidsp. I was keen to remove the dsp as it would reduce the time delay between the bass horn and mid horn. The mid horn driver sits further forward than the bass driver then add latency of the dsp and the distance between drivers is exaggerated. Mybe not a issue at the lowest frequency but I'm sure around the xover point it could be. Very happy with the results now. Before we had beautiful vocals and acoustic music but it lacked the kick for rock music. We now have that as well !!! Only thing that I lost was some of the bottom end, really need a sub now where I could have lived without before. Now I want to do a passive high pass filter for the QP to limit the out of band output. The distortion really increases below 50hz. Trouble with a low frequency filter is the size of the capacitors, 600-700uf . Is this ok to use such big capacitors on the bass channel? Anyway, just thought I'd share my finding and thoughts. Cheers Dave
  7. Sorry for the late reply. Not sure how to measure this... I sort of know how to use REW and that's about it! A long way short on knowledge when it comes to measuring speaker's... Sent from my Moto G (4) using Tapatalk
  8. Hi Claude No sub, this is a 2 channel system so I don't think I'm really missing out on much. When there is good genuine bass on the recording these sound great. The system as a whole is 100% so I don't want to throw another variable into the mix. Maybe later...... Cheers Sent from my Moto G (4) using Tapatalk
  9. They're back laying down as designed.... The mid/tweeter horn ended up being too high and I didn't want to mount it off to the side. Anyway pretty happy at the moment! Thanks again for the guidance... Sent from my Moto G (4) using Tapatalk
  10. That's about all the EQ I've got. Just thought if the standing up or opening up the mouth reduced this 160hz peak I thought we might get away with no eq..... Then just a simple low pass filter , all passive. Sent from my Moto G (4) using Tapatalk
  11. So, what is the "the predicated response"? As mentioned earlier it's a bit hard to take them outside to measure and if I measure them at close range the response is even harder to deal with... At the moment I have them relitively flat with just a bit of low end lift and they sound pretty good. With any more lift they start to take over and dominate . Sent from my Moto G (4) using Tapatalk
  12. Hi Claude Let me say ..... I'm really starting to hear what these horns are really all about! I now just have a simple minidsp on the bass only to EQ out the lift that these have in my room, strong in the 100-200hz range. I can now hear deep into these bass notes, lovely!!! Anyway, because of this strong mid bass lift I've always want to try standing these up to see how they respond. Did it the other day and yes the response is flatter, photo below shows the 2 responses, first is vertical and the second trace is in the corner as designed. Level adjusted for clarity. Listened to them vertically but was sure if it was any better. Started thinking about the difference in responses and the layout of the bass to mid horn's. In the flat position the bass and mid horns won't blend for until a distance from the openings. What if I cut the top skin of the bass horn and angel it up from around the edge of the first part of the horn profile , around 17" from the back edge. The horn will expand not only horizontally but vertically beyond the first part of the horn. One of my reasons for this is that it will allow the bass and mid horns to blend closer to the horn openings, plus the horn mouth volume will be larger. Lower Freq output??? Is this worth a try or will it completely screw up all your good design work?? Thanks Sent from my Moto G (4) using Tapatalk
  13. Thanks guys, I did try 100uf but from memory it didn't measure much difference. (Didn't save the trace for some reason). Anyway having a break from the horn project for a while as I'm getting tired of adjusting and tweaking and not listening to music! My DTQWT speakers are back in now, just hit play and enjoy! These don't have the same smoothness of mid range as the horns but have a beautiful refined "complete" sound and a really nice sound stage. With these I completely lose all sense of dimensions in my listening room. Maybe in a few weeks I'll give them another try. Cheers and thanks for your help along the way. Dave Sent from my SM-T800 using Tapatalk
  14. Well, tried putting a cap series with the bass driver and it made a huge difference!!! Red trace is the quarter pie with my second order input filter, blue trace is input filter plus 50uf series cap. The result is a lot flatter but has killed the lower bass too much. Time to retry Minidsp .
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