Given it is an ML-Voigt, standing waves ar significant. With no damping the only lowpass filters will be the restricted terminus, the driver offset, and a little bit from the expansion of the line at the fold.
The bass extension comes from utilizing the primary standing wave, but all the harmonics will cause ripple. How much ripple can the listener live with? This question is complicated by the room.
I would be at least lining the box, if not adding a bunch of well teased polystuff.
dave
As noted in my previous post, the expansion at the fold/corners are LP filter. Given no damping they play a greater role. Deflectors, as obvious as they mey seem, are counterproductive.
dave
Hi Dave,
If you are concerned about this enclosure after listening to it, please use polyfill and lining.
Hello everyone
I have just finished building a SDDBH-T13.5 type speaker with a Markaudio MOAP-11.2.
I compared it to my current 3-way speakers, custom-made by specialists on a French forum.
The SDDBHs do not bear comparison at all.
Of course, the manufacturing cost is not comparable either. (x 10)
With or without damping, and despite all attempts at output adjustments, the treble is very recessed and confused, the bass is also very recessed and blurred and the midrange is put forward, while remaining blocked in the speaker, it doesn't fill the room.
It's an interesting experience but I won't keep this speaker and I'm reassured that a well-built 3-way speaker offers the best sound across the entire audible range.
I have just finished building a SDDBH-T13.5 type speaker with a Markaudio MOAP-11.2.
I compared it to my current 3-way speakers, custom-made by specialists on a French forum.
The SDDBHs do not bear comparison at all.
Of course, the manufacturing cost is not comparable either. (x 10)
With or without damping, and despite all attempts at output adjustments, the treble is very recessed and confused, the bass is also very recessed and blurred and the midrange is put forward, while remaining blocked in the speaker, it doesn't fill the room.
It's an interesting experience but I won't keep this speaker and I'm reassured that a well-built 3-way speaker offers the best sound across the entire audible range.
Alren, I am sorry to hear about the results.
I've been uploading videos to YouTube to stop people from making enclosures they don't like, but it doesn't seem to have helped.
This box is complicated and it's easy to make assembly mistakes.
Do you have any photos of the inside, a frequency response graph, and an impedance response graph?
Alren
It doesn't feel quite fair to compare a 3-way for 10 times more expensive cost and a full range driver.
I'm not sure that a full range driver that costs 10 times more can give a better sound that beats your 3-way speaker.
Would be fun to compare a more expensive full range driver.
There are many drivers that are more expensive.
You need to play at least 50 hours and up to 200 hours to give a statement about the sound quality. Everything needs to be softened to give maximum sound.
It doesn't feel quite fair to compare a 3-way for 10 times more expensive cost and a full range driver.
I'm not sure that a full range driver that costs 10 times more can give a better sound that beats your 3-way speaker.
Would be fun to compare a more expensive full range driver.
There are many drivers that are more expensive.
You need to play at least 50 hours and up to 200 hours to give a statement about the sound quality. Everything needs to be softened to give maximum sound.
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It is true that the running-in only lasted an hour. I will continue a little longer.
Nevertheless, the difference is really significant.
No, I did not take a photo during the assembly but I followed the plan to the letter.
It is, in fact, not very fair to compare this wideband with a much more expensive three-way speaker.
But this three-way is in my living room, and the comparison is easy.
About fifteen years ago, I had built a speaker with a Fostex E sigma 208 and a T90 for the treble. My memory was good for male and female voices but it already lacked bass. This speaker had already been replaced by a better three-way.
Nothing serious, it is an experience.
Nevertheless, the difference is really significant.
No, I did not take a photo during the assembly but I followed the plan to the letter.
It is, in fact, not very fair to compare this wideband with a much more expensive three-way speaker.
But this three-way is in my living room, and the comparison is easy.
About fifteen years ago, I had built a speaker with a Fostex E sigma 208 and a T90 for the treble. My memory was good for male and female voices but it already lacked bass. This speaker had already been replaced by a better three-way.
Nothing serious, it is an experience.
They need about 100 hours of gentle break-in. If it essential to best performance and they will change, sometimes quite dramatically, in that space of time.
Once you get thru that you can start turning things up. If that first hour was not gentle you could well have imposed some meemory into the suspension (spider) and they will not reach peak sonics if that is the case.
Put them face-to-fave out of phase, throw a nblanket over them and feed them FM for a week.
dave