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gibbo9000

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About gibbo9000

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    Melbourne
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    David

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  1. Great piece of audio memorabilia, and very good addition as a surround processor. Nothing too complicated on the circuit boards so hum shouldn't be hard to resolve for someone with a little electronics knowledge (and a square headed driver bit!) GLWTS
  2. Hi Mark. Short answer is you will find the Raspberry Pi's a great solution unless you are talking top end systems. I have used them for a couple of years to support my main system and two satellite systems - the one on main system had a linear power supply. Still use them on the satellites. In my case they run Roopie and are dedicated end points, they run nothing else. I haven't found them noisy in any way (physically or signal). Mine are in aluminum cases with passive cooling. To my ears, if anything, I find them sightly harsher in top end than the ultraRendu, but that is being picky after I upgraded to the Kii 3's which are extremely revealing. With prior system around Moon 240i and Q-Acoustics Concept 500's was very happy with Pi's. If I have your architecture right, you may also want to try one for your main system. Roon recommendation / preference is to leave the Roon Core dedicated and not use it as an end point as well. I perceive slight improvements when I keep them separated, Haven't tried the Pi 4 - have a 2 and two 3's. Excellent value for money solution IMHO. Gibbo
  3. Sounds like you should have accepted Bob's offer to take them back (given you are in the US). Many happy users - including me - who have had no such issues with design / noise / build. Disappointed to hear you had a bad experience but sounds like the exception, not the rule.
  4. Might add the miniDSP SHD to the list. The SHD (vs SHD Studio) has Analog / DAC stage. Even if you don't use the room correction these are looking like pretty impressive devices. I have the SHD - Studio version and it gives my ultraRendu a good run for its money (and may replace it when SHD is fully Roon certified). https://www.minidsp.com/products/streaming-hd-series/shd-series Gibbo
  5. And nice work yourself Cazzesman. That sounds like an excellent outcome. The miniDSP / DL combination is a great addition - in what it does, and it what it helps you work out. The other thing it helped me confirm was speaker location relative to the cupboard they sit next to. Significantly better sound if the side drivers are in front/clear of the cupboard (rather than direct sounb hitting the side of it). My tweeters are closer to 950 from the wall, speakers 3.1m apart and 100mm toe in. Running with Boundary 0 and the 25Hz bass boost, and no signs of the limiter. The other thing I take away from the REW 'afterwards' graphs is that the low frequency roll-off isn't as sharp in practice as the DL estimate shows. New Kii filters look interesting on paper, and I also look forward to Roon compliance on the SHD-Studio (SHD-Studio and ultraRendu in series feels like a bit of overkill) Gibbo
  6. As always in this hobby, just as you thought things were sorted along comes another diversion 😬 Looks like we should add the miniDSP SHD - Studio to this list. Not yet 'certified' as a Roon end-point, but they have done most of the integration and it works. https://www.minidsp.com/products/streaming-hd-series/shd-series My first listening tests with the SHD - Studio (purely digital version) puts it well up there - possibly slightly harsher in mid / upper than ultraRendu, but marginal. And in addition it brings the Dirac Live room correction suite, and all sort of inbuilt tech to manage sub woofer cross over points etc. Pretty impressive. Gibbo
  7. Dirac Live 2 has the option to turn filters on and off within the DL2 interface, but this only appears to apply for music playing, not the test tones sent from DL2 for sampling. That misled me for a while. So below are the RTA graphs from REW for without and with filters for both channels (without on top, yellow/red are left channel, green are right) using the Dirac standard curve. It makes quite a visible difference in the graphs. In practice it noticeably tightens the bass - removes a little 'booming' but adds authority - almost too much for my liking. I am playing with a flatter curve at present. The Roon end-point integration works OK (it is not certified as yet) and provides volume control. It does seem to have some minor interaction issues with Roon on resolutions as an end-point. In one particular case it won't play a 24/384 file even though down sampling is set in Roon. The USB input seems more tolerant, so for the time being I have ultraRendu acting as end-point and feeding to SHD by USB, and SHD to Kii Controller via Coax. A bit of overlap, but it works. I think the SHD is a keeper as it solves room optimisation for all its inputs (incl. vinyl and CD), as well as streaming, while Roon DSP just tackles streaming. I doubt Kii DSP could do similar, and if it could with new filters would take months of trial and error to get there. Gibbo
  8. Had a good play with the SHD Studio today. Quite a learning curve around how Dirac Live 2 works as it has removed and/or automated a bunch of things people talk about changing in DLCT. Anyway, what did I learn: Without Dirac settings, the SHD Studio gives the ultraRendu/Curious USB combo a run for its money. If anything SHD is slightly harsher top end - but it isn't running a LPS. In my room/set up DL2 initially set its 'low limit' (below which it can't optimise) around 28Hz! It goes lower/better if you get further off axis, but the top end gets worse. So after much playing I found a 3db boost at 25Hz using the Kii's Contour control kept DL2 happy down to 17Hz. I can move curtains to drag it down to 15Hz but didn't want to push too hard. [Have removed some text and graphs here - was looking at the wrong thing. Updated in following post.] The one slightly annoying thing is that DL2 has automated the 'headroom' adjustment and its seems to be different for each Target curve - making back-to-back comparisons a little harder as you need to adjust volume each time. GIbbo
  9. miniDSP SHD-Studio arrived today. So far have it working as a Roon/RAAT end point (and SHD Volume Control does work counter to other reports). Interested to see how it compares to ultraRendu as a straight end-point, and then what Dirac can add.
  10. Yes - I can see what mean - more obvious from the top graph pre-optimisation that it is the room contributing. If I read the Dirac instructions correctly it does have the ability to move the 'curtains' to the left and right on the optimisation display (at least in v2), and they control the frequency range Dirac optimises to target over - low could be dropped to 15 or 10Hz and I would guess the 'cliff' would shift. But there is also the risk of over-driving the speakers. Sub makes sense with high pass filter on Kii's (and cross over / phase correctly calibrated) as suggested - but Dirac may still be able to optimise the combo down to 15Hz or lower.
  11. No target curve. I don't use any DSP correction - that is just direct feed into Kii Controller, and Kii DSPs set flat. Understand what you are saying about scales and the y axis of the graphs potentially disguising some of the fall off. Just wanted to highlight that it is not necessarily quite such a sharp drop off the cliff as Cazzesman graphs show. Can also be seen in @furtherpale optimisation graphs - just wondering whether Dirac Live optimises heavily down to 20Hz (boosts in this case), and then suddenly stops. Graph below is other speaker (in a 'better' position) and with db scale compressed and across full frequency range. Certainly tail off below 20Hz, but not a cliff. Gibbo
  12. Hi Cazzesman, I am a little puzzled. I see the 10db fall off in your optimisation graphs as you head below 20Hz, and assume that is what you are referring to as "drops off a cliff", and driving the investigation around subs. What puzzles me a little is I don't see that in my measurements - not sure if that is good or bad news, but I thought worth a mention. Graph attached is the 10Hz to 200Hz response I see (UMik-1 mic, Pink Noise, RTA, 50+ Averages, listening position - using REW) - and I don't see a sharp drop off. No DSP corrections applied (Boundary and Contour both flat). Leads me to ask whether it is possible the Dirac optimisation around the Harmon Curve is doing some heavy lifting above 20Hz but then nothing below, contributing to the drop? Or the 51 Hz boost you have added? Or my measurements are screwed up somehow (can never rule that out)? Anyone with more Dirac experience have a view? Gibbo
  13. Interesting discussion - wasn't over the advances in solar hot water integration. I thought it may be useful to add some data on the battery part of the equation given mention of Enphase batteries etc. Household load is typically 25-30kw per day, both work from home, swimming pool pumps are a noticeable part of our load. We put in a 5kw system about 8 years ago (when that was the max allowed). No name panels and Solivia inverter. First graph shows solar performance on sunny day: pink line is house load and pink shaded area is cumulative house load during day. Green is same for solar production. Purple squiggly line at top is grid voltage. 18 months ago we looked at all the batteries and eventually went Powerwall 2. Bottom line is it probably saves around $700 a year (above solar benefit) - so payback unlikely short of 20 years! But what is interesting is its impact on what our house load looks like on the grid. Second graph shows that for the same day as first. On second graph: Blue line is house load Yellow is solar production Green is battery flow - so above 0 kw axis battery is powering house, below battery is charging (from solar in this case) Red line is battery charge level Grey area is exporting to grid (when battery full) So for this day we bought no power from grid, and exported across the 2pm to 6pm period - when grid is at high demand. That is a positive impact IMHO. We are on a two tier tariff. Summer typically look like these graphs. In winter with shorter days, or on very cloudy days, we charge battery off-peak overnight and use during the day as needed. This is managed by a NUC accessing one of the solar forecasts and setting target battery level in Powerwall. It also manages pool filter load (so their run time is limited on cloudy days). Powerwall has its own inverter and sits on house/AC side of existing solar inverter (so no major changes to original install, just some updates to circuit breakers to bring in line with current regs). So it also runs as battery back up on select house circuits. Gibbo
  14. Looks interesting - and certainly encouraging if you can hear the difference. I don't know Dirac well - is the 'after' the Dirac estimation or actually measured? I assume the Headroom / Equalisation figures are db changes. If so, the rule of thumb is that +3db is 2 x the amplifier power, while +10db is 10 x the amplifier power. So -10db would be 1/10th of the amplifier power while -3db would be 1/2 the amplifier power. 1/10th sounds drastic, but it isn't that much in listening volume. If you have the Kii Controller it is the reduction in volume from say 70db (loud) to 60db (easy listening). In theory, the more headroom Dirac has to make 'upwards' corrections the better job it can do of its corrections IF the room is so bad it needs to do that much. That would be quite an aggressive adjustment IMHO. The downside is on the volume side - on very low volume recordings and -10db it is possible the amps can't generate enough gain to get to the volume you want (unlikely with what I have experienced on Kii's) and there will be slightly lower signal to noise ratio (likely unnoticeable unless the 22D is noisy - which I also doubt). In practice - I would guess there is unlikely any noticeable between between -6 and -10 other than volume -- and if you aren't running out of volume then I would guess the Dirac team have put some thought into their default and -10db and would run with that. Overall the presentation certainly looks more intuitive and user friendly than the Roon / REW corrections, or making a whole lot of filter corrections in the Kii DSPs. Along with the more sophisticated algorithms Dirac claim you could be onto a good thing. I guess the next technical question is whether you can move some of the corrections to the Kii DSP's (as you did with the 51Hz dip) and limit the work Dirac does -- and whether that makes any difference at all. Likely too hard. I would just go back to listening to that awesome sound stage. Have you listened Oscar Peterson Trio playing West Side Story? Tonight is awesome. Will keep my eyes open on when the SHD Studio from MiniDSP is officially a Roon end point.
  15. 85 Watts into 4 ohms. If anything underrated at these power ratings. Great price for an awesome amp. GLWTS
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