I've just started the "burn-in" process of my new DIY speakers, a pair of ML TQWT's .
From what I've heard the jx92s really need a long burn in before they start sounding right.
At the moment it's a lot of midrange, a little sharp treable if exactly on axis and not so much bass.
Otoh I'm not using any baffel step correction yet so the weak bass is kind of expected. It's all there just not so strong.
From what I've heard the jx92s really need a long burn in before they start sounding right.
At the moment it's a lot of midrange, a little sharp treable if exactly on axis and not so much bass.
Otoh I'm not using any baffel step correction yet so the weak bass is kind of expected. It's all there just not so strong.
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Hi markusG, wow, nice! I just got a pair of JX92S's as well.
As I'm sure you know, they are designed by Ted Jordan for off-axis listening, so they will always be too bright on-axis. 🙂
(a) is that some kind of acoustic material on the wall?
(b) what are those tubes on the floor?
As I'm sure you know, they are designed by Ted Jordan for off-axis listening, so they will always be too bright on-axis. 🙂
(a) is that some kind of acoustic material on the wall?
(b) what are those tubes on the floor?
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On axis they sound far too bright. They're meant to be 30 degrees out from the rear wall, to cross well in front of listening position. Depending on the enclosure design, they really benefit from BSC to balance out any thinness in vocals. Spoken word is a good test.
Those look very nice. Are they a variant of Peter Millet's TQWT design or one of your own?
And I'm guessing the cylinders are Musical Fidelity power amps?
Those look very nice. Are they a variant of Peter Millet's TQWT design or one of your own?
And I'm guessing the cylinders are Musical Fidelity power amps?
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Before I do anything I plan to break them in properly.
If I can afford it I'll get some measuring equipment before I start tweakig them with stuffing and "filters".
rjbond3rd>Nah, it's just regular wallpaper looking that way. The Tubes are Musical Fidelity X-A200 monoblock's. They can drive pretty much any load...
(X-Ray CD and Nu Vista Pre-amp)
Colin>It's my own design based on an older version of Martin Kings spread sheets.
30 degrees and crossing well in front of the listening position? Well ok? I'll give it a try. 🙂
If I can afford it I'll get some measuring equipment before I start tweakig them with stuffing and "filters".
rjbond3rd>Nah, it's just regular wallpaper looking that way. The Tubes are Musical Fidelity X-A200 monoblock's. They can drive pretty much any load...
(X-Ray CD and Nu Vista Pre-amp)
Colin>It's my own design based on an older version of Martin Kings spread sheets.
30 degrees and crossing well in front of the listening position? Well ok? I'll give it a try. 🙂
A few days later...
They appear to be "warming up" but it's hard to make any definitve statement about the sonic qualities at this point.
I imagine the percieved audio signature will change drastically when I begin tweeking them with BSC.
The bass really needs a boost imho.
They appear to be "warming up" but it's hard to make any definitve statement about the sonic qualities at this point.
I imagine the percieved audio signature will change drastically when I begin tweeking them with BSC.
The bass really needs a boost imho.
It also depends on cabinet. GM's 48" MLTLs have, if anything, slightly too much bass (at least in my room).
I suppose it also depends on what you want from a speaker.
The prototype BSC will be adjustable to allow fine tuning it. After I've tuned it I'll be making a more permanent and nice looking solution. This can take a while though since I plan on getting a measuring set-up.
The prototype BSC will be adjustable to allow fine tuning it. After I've tuned it I'll be making a more permanent and nice looking solution. This can take a while though since I plan on getting a measuring set-up.
The baffle is 215mm wide in total but the edges are rounded with a 5mm radius.
Do I use 205mm or 215mm when clculating the BSC?
Do I use 205mm or 215mm when clculating the BSC?
Hmmm, decisions decisions...
The edge (software) recommends f3 = 200Hz, I guess it compensates for room gain and such?
A regular BSC calculation recommends f3=535Hz?
Gaah, guess why I need the measuring capability...
The edge (software) recommends f3 = 200Hz, I guess it compensates for room gain and such?
A regular BSC calculation recommends f3=535Hz?
Gaah, guess why I need the measuring capability...
After listening to the speakers for a month I think they're getting broken in.
The bass have started comming around and the sound is less harsh.
You can get used to a lot of things and I could probably live with them as is but they are a little thin in the bass and it'll be interesting to see how they respond to the bsc.
After some thinking I decided to go with the 200Hz version.
The parts are ordered and I'm eagely awaiting the arrival.
The bass have started comming around and the sound is less harsh.
You can get used to a lot of things and I could probably live with them as is but they are a little thin in the bass and it'll be interesting to see how they respond to the bsc.
After some thinking I decided to go with the 200Hz version.
The parts are ordered and I'm eagely awaiting the arrival.
Hi,
I also built these speakers. Into my opinion the BSC filter is very important and mandatory, despite of the 3db loss in efficiency. Indeed I agree with you that in my room,without BSC, the bass was not there. With the BSC the sound is much better. The bass appears and, what I think is more important, the sense of reality is improved a lot, at least on good recordings.
I used the BSC values as suggested by the Jordan site: 2 mH inductor and 4 Ohm resistor if I remember well.
Renato
I also built these speakers. Into my opinion the BSC filter is very important and mandatory, despite of the 3db loss in efficiency. Indeed I agree with you that in my room,without BSC, the bass was not there. With the BSC the sound is much better. The bass appears and, what I think is more important, the sense of reality is improved a lot, at least on good recordings.
I used the BSC values as suggested by the Jordan site: 2 mH inductor and 4 Ohm resistor if I remember well.
Renato
That driver height and floor finish will maximize floor notch, no doubt part of what you're hearing.
I just realized something I forgot to mention.
The sound is so clean/pure that one doesn't notice how loud it gets when you crank up the volume.
The sound is so clean/pure that one doesn't notice how loud it gets when you crank up the volume.
Sorry Markus,
I built the MLTL 48 speakers, one of the projects available on the Jordan web site. i watched at your picture in the first post without enlargement and I did not realize the one you built are different, definitely taller.
The BSC filter suggested on the Jordan web site consists in a resistor and an inductor in parallel.
Renato
I built the MLTL 48 speakers, one of the projects available on the Jordan web site. i watched at your picture in the first post without enlargement and I did not realize the one you built are different, definitely taller.
The BSC filter suggested on the Jordan web site consists in a resistor and an inductor in parallel.
Renato
Hi markus. The sound radiating from the driver towards the floor reflects off it and recombines with direct sound. At mid-bass frequencies it results in cancellation. The better the reflection, the better the cancellation. All normal single-woofer systems suffer from it to some degree. A random Google hit with a little more in-depth info.
Thanks rdf. I knew about floor reflection of course but I didn't know what frequencies suffered from this cancellation. It actually explaines some of the simulatiuons I've done, there's a dip centered at 350Hz which would correspond pretty much exactly with what you said... Mid bass.
So, I guess I may have to try laying out some carpets in the future?
northernsky> Are you happy with the results?
So, I guess I may have to try laying out some carpets in the future?
northernsky> Are you happy with the results?
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