I recently finished re-building a set of Lynn Olson's Ariel Mark II loudspeakers and crossovers. They are phenomenal. I want to thank everyone here who helped.
I fear the $150 I paid for the speakers was false economy. They were much better than my CD player and amp, so of course I had to replace those (cost: $1000 US, plus tax.) Worse yet, now I have the bug. I want to build a set of speakers for my office. Uh oh. Wanna help?
The office is about 14X14 feet with 10" ceilings. Three sides are all drywall. One side, which will face the speakers, has a large window with Venetian blinds. I want floor standing speakers with the tweeters near my seated ear level, which looks to be about 45 inches. The speakers will have to be placed fairly close to the wall. In order that the speakers not look out of place, they should not be very large - certainly smaller than the Ariels. Because I am so pleased with the Ariels, I would like to use a transmission line, or maybe a quarter wave pipe. A single full range driver appeals to me. Because of the size of the room, I don't want high efficiency or the capacity to play loud. (With the Ariels in the room, I can't turn the 40 watt amp past 9 o'clock.) However, I want the bass to go low. (Who doesn't?) Room lift should work for me there.
Summarizing...
1) Floor standing
2) Rather tall (high tweeter)
3) The smaller the better
4) transmission line or tube prefered
5) low efficiency
6) single driver?
Oh. One more thing. I don't know what I'm doing. As a cabinet maker, acoustic engineer, or a passive filter designer, I would make an excellent fry cook. But then, ignorance has never daunted me in the past.
What say you all?
I fear the $150 I paid for the speakers was false economy. They were much better than my CD player and amp, so of course I had to replace those (cost: $1000 US, plus tax.) Worse yet, now I have the bug. I want to build a set of speakers for my office. Uh oh. Wanna help?
The office is about 14X14 feet with 10" ceilings. Three sides are all drywall. One side, which will face the speakers, has a large window with Venetian blinds. I want floor standing speakers with the tweeters near my seated ear level, which looks to be about 45 inches. The speakers will have to be placed fairly close to the wall. In order that the speakers not look out of place, they should not be very large - certainly smaller than the Ariels. Because I am so pleased with the Ariels, I would like to use a transmission line, or maybe a quarter wave pipe. A single full range driver appeals to me. Because of the size of the room, I don't want high efficiency or the capacity to play loud. (With the Ariels in the room, I can't turn the 40 watt amp past 9 o'clock.) However, I want the bass to go low. (Who doesn't?) Room lift should work for me there.
Summarizing...
1) Floor standing
2) Rather tall (high tweeter)
3) The smaller the better
4) transmission line or tube prefered
5) low efficiency
6) single driver?
Oh. One more thing. I don't know what I'm doing. As a cabinet maker, acoustic engineer, or a passive filter designer, I would make an excellent fry cook. But then, ignorance has never daunted me in the past.
What say you all?
Timn8ter said:
WOW! That looks like the one.
http://www.ejjordan.co.uk/JX92.html
How did you find that? Fs of 45Hz, and you can put it in a box 4" deep. Woo.
I wonder about that box that can be either sealed, vented, or TL. How carefully could it be tuned for the TL configuration? Plus, it could be taller. But the driver looks like it may be the one.
Dave
I've got an idea about making it taller.
The trick is to make it taller without lengthening the transmission line too much. So I had this idea: Add a skirt at the bottom. The transmission line would remain just as it is, but would open into a new wide, enclosed area at the bottom of the cabinet. Now then, put another board inside the skirt, running from the inside edge of the port to the bottom, turning bottom area into a horn pointed at the floor. The triangular void area could be used to house a baffle step filter or whatever.
Is that workable? Would it effectively lengthen the line too much? If so, I could leave off the "horn board", and even cut out the sides of the skirt if necessary. But I like the horn idea.
The trick is to make it taller without lengthening the transmission line too much. So I had this idea: Add a skirt at the bottom. The transmission line would remain just as it is, but would open into a new wide, enclosed area at the bottom of the cabinet. Now then, put another board inside the skirt, running from the inside edge of the port to the bottom, turning bottom area into a horn pointed at the floor. The triangular void area could be used to house a baffle step filter or whatever.
Is that workable? Would it effectively lengthen the line too much? If so, I could leave off the "horn board", and even cut out the sides of the skirt if necessary. But I like the horn idea.
phreeky82 said:
The amp is a very good one, by my standards anyway -- Rotel RA-02. It's rated at 40 W per channel. There's a slight problem with the Ariels in that it's a little difficult to adjust the volume, because I have to turn the knob such a small amount. If I just tap the volume button on the remote, it can move too far. I think I want to move the Ariels into my living room. Anyone in the market for a Polk home theater system?
a pot is just a variable resistor. typically a pot is linear (resistance varies linearly with the position), but audio increases volume logorithmically. so they make log pots.
and a dual log pot just has a single control (a 'post' that can be turned) controlling two of these in one - for stereo.
and a dual log pot just has a single control (a 'post' that can be turned) controlling two of these in one - for stereo.
I've been doing some figgerin. The cone area is given as 78.54 cm^2. The rule of thumb I've read is that the small end of the line should have the same area. But in the design given by E.J. Jordan is 49 cm^2.
I'm having difficulty reconciling the total box volume also. Can one of the TL gurus give it a quick look?
The box: http://www.ejjordan.co.uk/enclosures.html (Scroll down to JORDAN JX92S VTL vented/TL box design)
The speaker: http://www.ejjordan.co.uk/jx92.html
I'm having difficulty reconciling the total box volume also. Can one of the TL gurus give it a quick look?
The box: http://www.ejjordan.co.uk/enclosures.html (Scroll down to JORDAN JX92S VTL vented/TL box design)
The speaker: http://www.ejjordan.co.uk/jx92.html
You can even make them one, just a empty chamber under the transmisionline. Fill it up with sand and is is as dead as a rock and steady as it can beTimn8ter said:
Maybe an other idea...
can you make the (transmision)line one stait end whitout tuns? The end would be the floor becouse you need more length and you leave the back unused (or you fill it whit sand
Just some ideas...
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