Onbagz Posted July 10, 2014 Posted July 10, 2014 These look awsome. The finish is beautiful how do they sound. Sent from my iPhone 5. 1
zog Posted July 10, 2014 Author Posted July 10, 2014 These look awsome. The finish is beautiful how do they sound. Thanks! Yes I think my wife is happy they are now presentable bits of furniture rather than works in progress. She's even used the leftover varnish to paint a table to match. Soundwise - Big, but clear and detailed. Although I've only got an "early days" test crossover config it is sounding nice enough that I haven't felt a compelling need to tweak settings since, which is a good sign - although I will, I'm just not in a hurry. I haven't adjusted the relative levels since I replaced the HF amp PSU with one of lower power (see: JLH 1969 amp thread) so it's still retaining clarity even with some HF reduction. I don't go out and listen to many other stereos so hard for me to compare really.. and although I go out and see live music of all sorts its very rare to see it un-amplified (even buskers and small jazz combos in tiny clubs use PAs) to get any kind of comparison.
Nada Posted November 9, 2014 Posted November 9, 2014 Soundwise - Big, but clear and detailed...... I haven't felt a compelling need to tweak settings since, which is a good sign - although I will, ....... How is it sounding these days? Which of your waveguides did you find sounded best?
zog Posted November 9, 2014 Author Posted November 9, 2014 How is it sounding these days? Which of your waveguides did you find sounded best? Still sounding good! Still don’t have much of a reference as I dont listen to a lot of other speakers, but I enjoy them. I have stayed with the 18sound XT1464, these are by far the best for my setup. Still using the miniDSP settings from my last dabble with the ACD spreadsheet documented here, I haven't got around to refining them and getting to grips with Charlie Laubs new version with directivity plots, though I will sooner or later. But it sounds Just Fine so no rush. One minor tweak that has helped a lot from usability is I got one of those master slave power boards from ALDI, it detects when the TV goes into full standby mode (10 minutes after it is turned off) and powers off the two amps + miniDSP - as the TV is used as interface to the hifi in all modes, this has worked very well. Still not completely happy with the paint job, it looks OK most of the time but if the sun is in the room the blotchy bits are more visible, maybe another sand + coat (with roller not brush?) will be in order one sunny weekend.
davewantsmoore Posted November 9, 2014 Posted November 9, 2014 (edited) DSP on speakers design. Just noticed this post. hope this is useful http://www.grimmaudi...88/speakers.pdf There is a lot of wisdom hiding (well, not really hiding) in this paper .... which applies not only to "DSP speakers" (understanding the issues is important for DSP or not) Directivity - it's important in general, and also maintaining it as low as practical Crossover summing - getting your drivers to obey your chosen target response Correction - don't correct things in the response which are not resonances (ie. don't correct diffraction when designing a crossover) Filters - Linear phase filters have excessive pre-ringing when used for crossovers Edited November 9, 2014 by davewantsmoore
zog Posted July 8, 2016 Author Posted July 8, 2016 I've been happily listening to this system pretty much "as is" for two years, quite happy with the last "good enough" miniDSP profile. I've been switching between Class AB and A "HF" amps depending on the weather (it's definitely Class A weather at the moment)! My Tripath TA3020 LF amp developed a fault so I've dropped in my IRS2092 based Class D amp (a bit noisier, but still fine), but otherwise this system keeps on keeping on. One small little experiment I'm just about to try is a "super tweeter" - as above 10Khz I try and boost the response tail off of the compression/waveguide combo with fairly extreme miniDSP eq boosts.. but I'm curious to see what adding an additional HF driver, that doesn't need extreme software boosting to function may add to the sound. ..something suitable at least for proof of concept (response and sensitivity seem compatible) without blowing the budget is the Selenium/JBL ST200 - a pair are on their way to me, a simple first order HP filter of one cap and maybe an LPAD to tune levels should let me play with this idea without going active 3 way. 2
davewantsmoore Posted July 9, 2016 Posted July 9, 2016 (edited) as above 10Khz I try and boost the response tail off of the compression/waveguide combo with fairly extreme miniDSP eq boosts. What do you call extreme. The response of the driver on horn natually falls at 6dB/octave .... so substantial boost is normal. In a passive crossover, it is done the other way.... you are using substantial cut on the horn (ie a 6dB/octave high pass filter) Edited July 9, 2016 by davewantsmoore
zog Posted July 9, 2016 Author Posted July 9, 2016 What do you call extreme. The response of the driver on horn natually falls at 6dB/octave .... so substantial boost is normal. In a passive crossover, it is done the other way.... you are using substantial cut on the horn (so it falls by 6dB/octave) Picture tells a thousand words.. and yes I know I need some HF boost to offset the horn response, but I always had sitting in the back of my mind that I was doing it even more for this driver than my previous "Econowave" style ones. btw here are the other MiniDSP setttings in play, while I'm in the GUI.. it's been a while since I was in there but I think I got these from a mixture of ACD calculations (closer to the crossover point) with a bit of "hand tweaking" afterwards (at the higher and lower ends)
davewantsmoore Posted July 9, 2016 Posted July 9, 2016 Ok, that is fairly substantial boost in just the top octave.... for I assume what is a 1" exit compression driver? It's tricky.... measurement technique (where the mic is), and microphone calibration ... can make a big difference in that region to what you see on your chart. GL. I've ben very tempted by this myself ... but I always run up against the problem of where to mount the ST so it is not harming the crossover region.
zog Posted July 9, 2016 Author Posted July 9, 2016 Ok, that is fairly substantial boost in just the top octave.... for I assume what is a 1" exit compression driver? It's tricky.... measurement technique (where the mic is), and microphone calibration ... can make a big difference in that region to what you see on your chart. GL. I've ben very tempted by this myself ... but I always run up against the problem of where to mount the ST so it is not harming the crossover region. I'm using a 1.4" comp driver.. so I assume not as good at the upper end than the smaller ones, though it does sound great over most of it's range. I do have some outdoor, with no EQ, multiple angle, measurements I did a long time ago as reference (from post #140 of this thread!), which makes me even consider putting a LP to get rid of the bump @ 10K, but I'll see how it behaves with the ST200 first... if it doesn't work out I've probably got enough bits in the garage to combine with the ST200 to hot up my "ebay junk picnic blaster" mini DJ system :-)
Guest atilsley Posted July 16, 2016 Posted July 16, 2016 I love those screen shots of MINIdsp..takes me back. Out of curiosity, why the rise in the bass and tweeter near the xover points? Andrew
zog Posted July 16, 2016 Author Posted July 16, 2016 I love those screen shots of MINIdsp..takes me back. Out of curiosity, why the rise in the bass and tweeter near the xover points? Andrew I can't remember exactly now, I didn't "explicitly" set them like that, but the specific crossover filter I happened to try that gave me the response I was after happened to have that property. I'd have to dig up the spreadsheets to see exactly what kind of filter it was - the numbers were generated using ACD: ( http://audio.claub.net/software/ACD/ACD.html ) which can spit out miniDSP configs.
zog Posted September 13, 2017 Author Posted September 13, 2017 @mwhouston asked for some enclosure info in another thread, so I'll note it here: Blog posts about the enclosure, which I estimated at 131.3 Litre, with two 24cm bass reflex ports: https://minirig.org.au/2014/03/13/bass-reflex-enclosures-for-the-lorantz-woofers-now-underway https://minirig.org.au/2014/03/16/enclosures-for-the-lorantz-woofers-assembled-and-now-making-sound-at-last measurement made of just the bass driver in the enclosure with no EQ except the crossover function https://pix.minirig.org.au/main.php?g2_itemId=6442 plus other measurements made with EQ added.... dumping ground of photos made during assembly: https://pix.minirig.org.au/main.php?g2_itemId=4309&g2_page=14 1
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