3ll3d00d

sounds pretty rubbish what are the features you really need from the Motu?

I thought this was a feature of the motu interfaces? It has DC coupled analogue outputs which enables it to be used with software like http://www.motu.com/products/software/volta/path.html I am not sure if there is any particular requirement on the cables when using such devices (http://www.expert-sleepers.co.uk/siwacompatibility.html suggests there might be, nothing immediately obvious on the Motu site) or if this is something your custom software has triggered in some way.

when I said the crossover was a wildcard, I meant in relation to my commentary which just talked about individual drivers and how they might combine. I just meant that adding a crossover is going to have a major impact (stating the obvious but still). On that note, it sounds like you have a well thought through plan so it will be interesting to see the execution. I take it it is an active crossover? Will be interesting to see if the crossover & physical offset of the drivers is able to maintain control in the horizontal dimension for long enough to allow a smooth transition to the horn alone. The coax figures just came from their website btw, it has some directivity plots on there which show ~80 degrees down to 500Hz. I have no idea how reliable that data is. Any idea if the TD6 is readily available? I enquired about that driver last year & he commented that it's not a regular offering (hence not on the website) but he does have the ability to make them on order. I don't think I'd be particularly confident about receiving such an order in any reasonable timeframe though.

It's not obvious how this is better than a big coax. The SEOS 15 starts to lose control vertically at ~3.5kHz as the -6dB point widens from ~50 degrees at 3.5kHz to ~110 degrees at 1kHz (based on http://attitube.com/wp-content/uploads/2013/02/SEOS15Vert.png which comes from Bill Waslo's measurements). It has also narrowed further to ~40 degrees at 10-15kHz. Meanwhile a vertical pair of 6" woofers will be pretty much omni up to this point won't they? This basically means you're omni at ~500Hz down to 120 degrees at 1kHz, 50-60degrees at 4kHz and ~40 degrees at 16kHz Compare to something like http://www.bcspeakers.com/products/coaxial/15-0/8/15cxn76 which gives you ~80 degrees from ~500Hz to ~20kHz (probably marginally narrower at the top end, maybe 60 degrees). Basically the coax looks like it controls directivity to a much lower frequency while also holding up a wider pattern at the top end. OTOH the upper end of the SEOS will undoubtedly be cleaner than a big coax which seem to get a bit ragged to say the least. The other wildcard is whether you can maintain that vertical directivity once a crossover is in place, the coax should be much easier to work with in that regard.

There is a spec for the radian on their site (http://www.radianaudio.com/download/5210-2/) which gives it as 4.65mm There's a some discussion & klippel measurements of the TD6H in http://www.diymobileaudio.com/forum/klippel-reviews-driver-specs/115207-acoustic-elegance-td6h-8-a.htmlif you haven't seen it, you have to register to get the download. I exchanged a few PMs with bassaddict and it was definitely the dual TD he wasn't happy with, he commented on them having a "harsh gritty edge to voices" that he couldn't get rid of despite trying a variety of things to solve it (I don't know what things specifically, it was a few brief PMs). I imagine the thinking is something like ported gives decent output to ~200Hz and that's enough for surrounds/heights. Won't turning the SEOS on its side blast a whole lot of output vertically? This doesn't seem desirable (though I don't know what your room layout is so can't be sure on that). Do you know how you intend to control directivity "horizontally" (vertical in a normal orientation) given the driver layout?

I take it you have seen http://www.diysoundgroup.com/forum/index.php?topic=228.0and the corresponding thread on avs http://www.avsforum.com/forum/155-diy-speakers-subs/1470958-td15m-seos12-bms4550-theater-progress-dual-td6m-seos12-bms4550-build-d.html . AIUI that guy was never happy with the dual TD6 for reasons he couldn't get to the bottom on. How far away will you be sitting? I have a radian 5208 waiting to be built, have done the crossover but i am v slow at woodwork I have a thread on avs with the details and there is some discussion on diyaudio too (link to diya at the end - http://www.avsforum.com/forum/155-diy-speakers-subs/2104738-surround-options-small-room.html ). I know the 5210 is highly rated as well, I believe beastaudio uses them so plenty of people here must have heard them given the gtg. If you want some particular measurement then I could probably do that at some point.

I find I can get to 50-60 degrees in room before the data quality degrades too much, til that point the data is consistent with that achieved outside (with a longer gate). I think the horn being in a separate box should make it a fair bit easier for you too.

Are you going to make a polar plot for the horn on its own? It would be interesting to see those results if you do. I got my dual td12/seos10 tested at the weekend and the seos looks quite dinky next to the rest of it (hence wondering if I can squeeze a bigger horn in there if it is really worth it).

i don't follow you here, what is the connection between steady state fr with effectively no gate (or smoothing) and transient response?

Vibsensor is a useful tool for seeing what is going on on a particular surface under ~40Hz. I don't see this as having anything to do with transient response nor music playback. I find that that effect, since adding a NF sub, accentuates feelings of dread/tension during certain scenes and that running it too hot makes it a bit too much of a rollercoaster. If I sense the NF during music playback then that is just wrong for my preference. My preference sounds closer to bosso with respect to FR BTW, I run it with a small (~3dB) lift from 120Hz down to 40Hz (roughly) and flat from there. The NF response is broadly flat from 15-45Hz and rolls off steeply either side using 2nd order NT filters, this means the NF is really completely gone by 60-70Hz (and the filter is setup so that combines nicely with the main sub to avoid any artefacts as we move firmly into the audible range). Personally I think it was a great vfm upgrade, not essential but nice to have for sure.

the problem is just that you can't copy the params straight into jriver and go for it, you'd have to spend time porting the published values to something that jriver can handle. Here's an example the red line (in acourate) is the BEQ filter for the Pacific Rim LFE channel, you can see it's basically a fairly steep shelf filter that adds 28dB by about 6Hz and starts ramping up at ~40Hz the green line is a LS with S=1 (Q=0.707) at 15Hz with +14dB brown is the result of stacking 2 greens (to give 28dB total boost) the REW trace is showing what happens when you run 1 and then 2 of those LS filters through jriver which shows that it can implement that filter IMV that's a pretty close approximation to the intended curve and a much simpler filter to enter. If you want to fine tune it to hit the original BEQ filter more closely then you would just stack up some small notch filters along the curve to push it up/down as appropriate. It's not that hard to do if you can loopback jriver into REW as you can just iterate over it until you get a result that matches the target. Obviously it's a lot easier if you have a feel for how different filter shapes will sum up but that's just practice. The only stumbling block is working out what the actual intended filter shape was. You could do this using the minidsp spreadsheet by plugging in the values and then copying out the values for dB by freq into another worksheet, summing those values up to get the final filter shape and then working out a jriver compatible filter. In fact you could do this all on paper without the loopback at all by plugging such values into a spreadsheet. I imagine this would be quite easy to do actually (albeit probably rather tedious work).

I find excel, i.e. me writing equations in excel, terrible at that sort of equation unless you break it down into many cells. Funnily enough though I used what you posted to calculate that post earlier and it worked OK

You would think it would be a few lines of code affected at most. Until then there is probably a vst plugin around that would do the job.

run a sweep through a jriver zone configured appropriately and loop the output back into REW (or similar) then compare against a theoretical shelf filter. This gives you these are all 50Hz +5dB low shelves for which S=1 is equivalent to Q = 1/sqrt(2) ~= 0.707 green: jriver Q=0.5 red (hidden behind blue): jriver Q=1 blue: acourate Q=0.707 brown: acourate Q=1 blue is almost exactly the same as red, the minor variation is because I used 0.707 rather than 1/sqrt(2) This proves that jriver means S when it says Q when it comes to a shelf filter. I'm not sure of a tool that lets you sum filters on paper other than acourate, I guess it would be possible to write one. I don't know of a calculator to convert between Q and S either but easy enough to plug into excel or similar.

the jriver devs haven't commented one way or the other but my testing says they say Q on the dialog but it is implemented as S. I wouldn't say this invalidates it but it does mean the shape of the filter is not going to be exactly as intended. If you have a way to calculate and sum filters offline then it is easy enough to create a different set of filters that jriver does support and will fit the provided target more closely. I could do it though it might take me a while to get round to it.

Fair point, I didn't mean to imply that ant man was ground breaking, it was just more fun and not basically a pretty close remake.

I agree, it's quite painfully formulaic. Admittedly I watched it on a plane the other day but I watched Ant Man beforehand, totally different ball game.

What sort of difference in thd have you seen from going to increased loads? This sort of data (thd vs freq at different output and under different loads) seems almost completely absent from published specs so I am curious to know what sort of real world impact is.

https://yabb.jriver.com/interact/index.php?topic=98734.msg699035#msg699035

I was referring to the use of zones to output to different locations and/or devices. It is not so much me over complicating zones as zones being able to be used for some relatively complicated use cases, it can be nice to have options though. BTW apparently that dsp preset approach wasn't working properly for video anyway, fix in the next build.

The jriver DSP interface certainly has some ease of use issues.

yep it would and it is see https://yabb.jriver.com/interact/index.php?topic=91434.0

you have 2 choices 1) manually load and unload the DSP configuration before & after watching the film 2) set the DSP field on every film in your library

It can be done. The feature to load/save DSP was introduced in MC20 and is described as NEW: DSP presets can be loaded per file by setting the DSP field (the list is from Load/Save on DSP Studio). This means you can enter it once, save it and then load it on a per film basis. Alternatively you set the value in the DSP field in your library. However if you do it this way, bear in mind that it is implemented in a slightly crap way atm, it loads it when you play it but doesn't unload it back to a default state when you stop. This means you'd have to update the DSP field on every other track with your default setup. Whether this works for you depends on your setup, I think it plays particularly badly with multiple zones for example.

I didn't mean to scare you off!! To enter the filters in jriver is just those pics I showed of the jriver DSP. It is literally just clicking a few buttons. Ignore the discussion of exactly what filters to enter. It is a shame jriver doesn't support a simple way to import a filter set as that would make it way easier. BTW http://yabb.jriver.com/interact/index.php?topic=99096.0 is the current thread that collects various eq related features that people want in jriver. Feel free to post there to show support for some of those requests.