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If you have, what do you think of it ?
I just asked them for such a service for a bookshelf speaker using Scan R2904 70000 and the 18WU/8741.
Alan
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Base on the required driver, here is what the LEAP services comes up with from Madisound.
I am considering to buy the assembled crossover based on this schematics from them.
The crossover point for the tweeter seems very low for me.
Any comments ?
From the replies so far, it's clear that using the service will get you some way down the road, but not to the end of the road. This is as I would expect. My advice to you is to buy LEAP or some other software so that you can measure, model and tweak all you want/need until it's right.
:)
I'd buy SoundEasy (not really that easy...but waaaaaaaaaaaaay cheaper than LEAP) and build/measure/design/repeat to your hearts content. And I have bought it...and LSPCad Pro and ....
Scott
Scott Hinson
speakerscott.tumblr.com
www.etsy.com/shop/SpeakerScott
Scott, have you tried my free crossover design program? (see link below)
Oooh...Bill...no I hadn't. Just installed it...I'll have to look at it some more. The interface looks far easier to deal with than SoundEasy. One thing though, and it's just a *minor* feature to add to your list: Crossover Emulation. ;-)
SoundEasy and LSPCad are amazing at it...I suppose you could export filter constants to miniDSP and that would work well too.
I really like to go round and round in the listening stages...tweaking and settling in.
Scott
Scott Hinson
speakerscott.tumblr.com
www.etsy.com/shop/SpeakerScott
P.S. Thank you for providing that to the DIY community!!!
Scott Hinson
speakerscott.tumblr.com
www.etsy.com/shop/SpeakerScott
I am simulating a series notch filter with the speaker with your free program. (nothing else).
The freq response graph does not change at all and only the impedance graph changed. Is this normal ?
I was expecting a change on the freq graph as well or am I wrong on my understanding ?
How do I get drivers information for the simulation ?
Thanks.
Alan
Alan,
It's too bad you're in Hong Kong. The Madisound service will get you a long way towards having a usable speaker. It won't get you a final speaker that works as well as it possibly could.
I can go from measurements to simulated flat frequency response in less than an hour for most two way designs.
However, a flat frequency response does not take into account the audibility of resonances, distortion, off-axis anomalies, etc. Once you make a change you then have to go back and check phase response, impedance etc....
One example I have is posted in the picture. It's a two way design I did using a Morel MW-266 woofer and a Smith Horn compression tweeter lens driven by a 1" compression driver.
The initial crossover and final crossover are among the 4 plots posted...looking at any of those frequency responses individually would indicate a reasonably well designed speaker. Listening to those speakers would tell you otherwise.
Scott
Scott Hinson
SpeakerScott Tumbler...my latest follies.
It's way more than flat response. You need to know the response of the driver in its box and with its crossover. That can tell you a lot about transients, etc. But LEAP can do that. A friend used LEAP years ago to design speakers and he was always at least 95% there off the computer. And the last 5% was as much taste as accuracy and LEAO has come a long way since then. The Madisound cost is cheap, cheap, cheap for the head start it gives you. Designing a crossover any other way is like being dropped in the middle of the woods with at most a compass and trying to get home.
Oh...I agree that flat response isn't everything. Nor is transient response everything. There is no single parameter that needs to be optimized at the expense of others...the system must be examined in context.
There are many things that cannot be modeled without tremendous effort. I know that Madisound measures the frequency response and impedance of drivers in their anechoic chamber...which is fantastic. You aren't going to get a cookbook crossover. But for $40 they aren't measuring the drivers in your enclosure, and they aren't going to be going into tremendous effort looking at the completed system design and measuring the completed design to make sure there are no unintended consequences elsewhere.
I think the service is fatanstic and a good value. I would never consider the crossover to be remotely final.
Scott
Scott Hinson
speakerscott.tumblr.com
www.etsy.com/shop/SpeakerScott
Madisound has a very good grasp of basic speaker/crossover design, and the LEAP software is very good at simulating response curves. However, it does not perform miracles, and, for the price, shouldn't be expected to. It will get you much farther along the speaker building process than doing all of the xover design yourself, and get you closer to a satisfactory system than you could ever get yourself by using textbook design formulas. But it is only a starting point and you might need to refine the sound a bit to your personal taste. They will be very gracious about assisting you to do that.
And, yes, I live in Madison, and I've known the owner of Madisound for over 40 years. I have used their services more than a few times, and helped many others as well.
Peace,
Tom E
I've used that service for years. A lot of it depends on YOUR input. aka - what slops you want, parts you use, orders, etc...
I've had plenty of great designs over the years. However you must be proactive in voicing what you want. And also listen to their advice if they give it. They are not a "hard sell" business.
I would use them, but also understand the crossovers design is a STARTING point and will need little, or sometimes no tweaking.
charles
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