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Old 5th March 2013, 03:09 AM   #441
Rob41 is offline Rob41  United States
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My miniDSP and UMIK-1 mic just arrived a few hours ago. Thank you Devteam!

Most of the folks here at diyAudio (99%) have way more knowledge and expertise at all things audio so keep that in mind when I give my noob opinions about this product.

My world has changed forever. Going active has opened up a whole new world to me. I almost feel like I'm cheating using the miniDSP 4x10. I've never built a passive crossover but feel I could after sifting through a ton of how-to's and at least be in the ballpark. Going active with the 4x10 tonight I was up and running in about 25 minutes and what I heard sounded better than the passives I just replaced.

Granted, the drivers I've got in my old Cerwins are a terrible mismatch but I was able to make them sound good with just some basics. Before it arrived I entered beseline crossover points base on the driver manufacturers specs and at least as far as crossover points go it got me pretty close.

I did adjust from 800hz and 5khz to 750hz and 4.5khz which seemed to sound better. I haven't deviated from the default settings of 8th order LW all the way around yet but I'm guessing that won't be optimal. I still have a great deal to learn.

Tomorrow I'll fire up the mic and REW and make frequent stops at the tutorials. I realize what I've got now is only a crude "rough in" and I've got a lot more to adjust/learn etc.

So far the 4x10 has met all of my hopeful expectations and has worked exactly as advertised. The hardware and software is extremely easy to use. I know every set-up is different, but in my tri-amp system I was unable to detect any unwanted noise or other audible anomalies using the 4x10.It sounded very clean and clear to my ears. I have not used the mic yet so I don't know if anything would be detected that way.

Even though the threads often go over my head,thanks for all the great input in this forum.
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Old 5th March 2013, 03:14 AM   #442
OllBoll is offline OllBoll  Sweden
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Originally Posted by Rob41 View Post
The hardware and software is extremely easy to use.
This cannot be said enough, it's feels like cheating when you use it

A thing about such steep filters though: If I remember correctly such steep filters will exhibit ringing off axis where both drivers don't have matching dispersion, Bruno Putzeys has written some on this forum about this. Because of this they recommend that no steeper than 24db / oct or 4th order filters are used. 4th order quite steep already though, the difference from 8th order in driver strain is very marginal in most cases.

Last edited by OllBoll; 5th March 2013 at 03:20 AM.
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Old 5th March 2013, 03:29 AM   #443
Rob41 is offline Rob41  United States
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Originally Posted by OllBoll View Post
This cannot be said enough, it's feels like cheating when you use it

A thing about such steep filters though: If I remember correctly such steep filters will exhibit ringing off axis where both drivers don't have matching dispersion, Bruno Putzeys has written some on this forum about this. Because of this they recommend that no steeper than 24db / oct or 4th order filters are used. 4th order quite steep already though, the difference from 8th order in driver strain is very marginal in most cases.
Thanks for the heads up on that. Tomorrow I'll have to try out some filters that aren't as steep. I don't have the best drivers to work with right now but at least I'll be able to learn more as I go and in the process try to make the most of what I've got now.
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Old 5th March 2013, 08:52 AM   #444
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I did adjust from 800hz and 5khz to 750hz and 4.5khz which seemed to sound better. I haven't deviated from the default settings of 8th order LW all the way around yet but I'm guessing that won't be optimal. I still have a great deal to learn.
Sounds about right. Maximizing dispersion characteristics of the drivers you did there, while possibly reducing distortion at the same time. Your ears have proved to be a great asset.

Echo OllBoll sentiment on the higher order filters. LR4 should be plenty

Quote:
I don't have the best drivers to work with right now but at least I'll be able to learn more as I go and in the process try to make the most of what I've got now.
Discovering what is happening is the best place to start. Doesn't matter what you have, a single driver from an old boombox or high end multiway there is always room for improvement. Learning what and how sound is affected by reality will put you on the fast track to acoustic nirvana

Back when I started down this road had a mentor who imparted a few bits of his grand wisdom. One of which was listen to the music, not the speaker, your ears will tell you what is wrong. Another is to listen to each driver first and then to listen to that assembled speaker by its singular self in mono, noting response and on/off axis dispersion. If you can get that right, most everything else falls into place. With the tools you now possess this education will blur a bit due to the high influx of mental feedback
Cheating? Fast tracking is more like it! Sure beats boxes and boxes and boxes of crossover parts and endless hours doing calculations on a HP41 or TI59 with burnt fingers, or taking measurements with an old Simpson analog meter. Measurement mic let alone calibrated was beyond most people budgets and spectrum analyzers were non existent outside of Pro sound, CSD waterfall didn't exist at all... Ahh but those were the days of myth, magic and marketing
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Old 5th March 2013, 07:25 PM   #445
Rob41 is offline Rob41  United States
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Ahh but those were the days of myth, magic and marketing
Lol, I feel like my eyes have finally opened up for the first time.

I'm using a 15" pro woofer, a cheap pro selenium compression driver mid, and a pretty good Dayton planar tweeter. All of which are terribly mismatched in every regard, and yet with the miniDSP I'm able to make them sound very good to me. I can only imagine what it will be like when I select very good drivers in a properly executed enclosure.

I've turned a corner and will never go back. I see no pre-made speakers in my future ever again. IMO, listening tastes are so subjective that it's unlikely I would prefer pre-built speakers with passive crossovers to ones that I can build for active use.
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Old 5th March 2013, 08:15 PM   #446
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I started with a small two way Foster speaker. Can't think of the model, but had a 5" midwoofer (very nice driver). Tweeter foam rot so replaced them w/ domes. Started playing with the crossover and I was hooked. Bought a few retail speakers when I couldn't build things and shortly tossed / sold off when I could build again... that was 35 years ago

Funny wife almost bought me a pair of ML Motion 12's recently, that was until I pointed out a few flaws in the design wanting to (WOULD) correct and started tallying up the cost. She said forgetaboutit, build what YOU want.
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Old 6th March 2013, 03:24 AM   #447
Rob41 is offline Rob41  United States
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Quote:
Originally Posted by Greebster View Post
I started with a small two way Foster speaker. Can't think of the model, but had a 5" midwoofer (very nice driver). Tweeter foam rot so replaced them w/ domes. Started playing with the crossover and I was hooked. Bought a few retail speakers when I couldn't build things and shortly tossed / sold off when I could build again... that was 35 years ago

Funny wife almost bought me a pair of ML Motion 12's recently, that was until I pointed out a few flaws in the design wanting to (WOULD) correct and started tallying up the cost. She said forgetaboutit, build what YOU want.
I think it's kind of like the Matrix. Do you want the red pill or the blue pill? Once your eyes are opened you can't ever go back.
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Old 8th April 2013, 06:13 PM   #448
tusker is offline tusker  Kenya
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Originally Posted by minidsp View Post
A comp/lim is indeed something that we'd like to implement as well.. Maybe in a future plug-in... We'll have to see if that fits in the DSP processing left... :-)
Hello, since this post was from December 2010, may I ask if there is any progress on that?
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Old 12th April 2013, 05:37 PM   #449
Badge is offline Badge  United States
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Got a quick question. I have my MiniDSP installed with a power supply. Can I plug in the USB cable and make some changes without disconnecting the power supply? I guess I am wondering if the the USB power and the independent power supply are to much for the unit?
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Old 12th April 2013, 06:00 PM   #450
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Originally Posted by Badge View Post
Got a quick question. I have my MiniDSP installed with a power supply. Can I plug in the USB cable and make some changes without disconnecting the power supply? I guess I am wondering if the the USB power and the independent power supply are to much for the unit?
I do this all the time without any problems on my 2x4 units. Not sure what the DevTeam would advise on this officially...

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