Glad to welcome everyone to this forum. I regret that my first post is asking for advice.
A few months ago I decided to put together a three-way speaker, I chose the right size and design for my taste and room. I ordered the speakers, started to make arrangements for cutting the cabinets for the subsequent assembly of the cabinets. Then, when I started to make the crossover, I noticed that the website did not specify the values of the electric parts. Without going into details, I cannot order a kit from Denmark, no matter how much I would like to. But okay, the crossover can be calculated by myself with a measuring microphone and theoretical articles from the internet (or buy a universal pre-fabricated filter).
But suddenly I found out that the 22W/8534G00 driver requires a much larger volume... Should I recalculate the cabinets for a larger volume (and how to do it), or should I do it as is?
This is a link to the project I'm talking about
Again I apologize for the newbie questions, I will hope for your goodness!
A few months ago I decided to put together a three-way speaker, I chose the right size and design for my taste and room. I ordered the speakers, started to make arrangements for cutting the cabinets for the subsequent assembly of the cabinets. Then, when I started to make the crossover, I noticed that the website did not specify the values of the electric parts. Without going into details, I cannot order a kit from Denmark, no matter how much I would like to. But okay, the crossover can be calculated by myself with a measuring microphone and theoretical articles from the internet (or buy a universal pre-fabricated filter).
But suddenly I found out that the 22W/8534G00 driver requires a much larger volume... Should I recalculate the cabinets for a larger volume (and how to do it), or should I do it as is?
This is a link to the project I'm talking about
Again I apologize for the newbie questions, I will hope for your goodness!
Oops, I worded that wrong.
Contacted a local engineer, these are his conclusions based on the driver specs. And because of that, I've put the cabinets on hold.
Unfortunately, I don't have the right knowledge to criticize his opinion, so I value your opinion.
I don't understand the problem. Troels' cabinet sketches - from which you can estimate the volume or just replicate - crossover topology and crossover points are all documented on the page.
There are a lot of questions in general, the main one is whether it is worth copying, knowing that this driver is not quite suitable for small volumes of this project (at first sight). Even the site loudspeakerdatabase recommends 40 liter box for these drivers.
And if not to copy, is it realistic to calculate the optimal parameters of the enclosures with these three drivers?
Yes, I know that reason, and I certainly respect his choice. Many have copied his designs and passed them off as their own, ended up making money off his labor.
Normal box calculations are invalid cause this was designed and tuned to be placed in a corner/bookshelf.
I recall someone built this (or you can search for this model on his builder response page) and said it sounded alright.
I recall someone built this (or you can search for this model on his builder response page) and said it sounded alright.
Yes, thanks, saw that thread. A man has been building them in covid for several years. As for the sound, it's a matter of listening experience. When I first heard studio monitors after a $50 home speaker, I was absolutely thrilled. I don't know about that person, but subjective feelings should be treated with caution.
And unfortunately, due to forum limitations, I can't contact him directly about that build to get more details.
That makes more sense now, thank you.
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Troels‘ design is an aperiodic vented cab. So neither normally vented or closed. Essentially you build a lossy cabinet to compensate for small volumes.
This enclosure might fit the bill just fine for this driver. Although I would have opted for a closed 3d order tuning with a series cap, since that is a better way to get building results that can be reproduced by people without the gear or knowledge.
Oh yeah, forget about the felt lining Troels advocates. That stuff doesn‘t do enough to justify the trouble. Fill the enclosure with the right acoustic stuff. Acoustic foam, mineral or other wool or denim sound absorption, you name it. That also is a better way to deal with a cab that is quite small for the intended driver.
Famous last words 😀: bass tuning with the classic calculations is becoming a thing of the past. The room is the dominant factor.
This enclosure might fit the bill just fine for this driver. Although I would have opted for a closed 3d order tuning with a series cap, since that is a better way to get building results that can be reproduced by people without the gear or knowledge.
Oh yeah, forget about the felt lining Troels advocates. That stuff doesn‘t do enough to justify the trouble. Fill the enclosure with the right acoustic stuff. Acoustic foam, mineral or other wool or denim sound absorption, you name it. That also is a better way to deal with a cab that is quite small for the intended driver.
Famous last words 😀: bass tuning with the classic calculations is becoming a thing of the past. The room is the dominant factor.
Indeed, it's specs once a little series resistance from XO components are factored in, then Vb = Vas, Fb = Fs, but as others have pointed out one has to account for the needs of the app. 😉
Few experienced designers will directly follow the "optimum" predicted by a box program. They won't be miles away but will assign different relative importances to the balance of factors involved. In this case there is boundary reinforcement from the wall and the use of strong damping in the port neither of which are likely to be considered by most simple box programs. If you look at the measurements the bass extension is modest for an 8", the efficiency reasonable and the size modest which are the major trade-offs in a box design.
My recommendation for a beginner's first go would be to stick with the design as is rather than attempting to modify it unless you are happy to learn from your mistakes in possibly making the overall speaker worse by over emphasizing one aspects at the cost of others.