Several questions about the TL enclosure...
1. That trapped 5x5x8.5" space near the bottom bugs me. I can't help asking why the line wasn't done conventionally -- after the back portion of the line, have it go up, then back down and out through a port at the bottom of the front panel? This would add 5~6" to the line.
2. What adjustments to the line would have to be made if the tweeter is mounted on top & woofer mounted below? I would like to use 1.25" 1/4 round router bit around the tweeter's front baffle perimeter. If positioned to the top of the baffle, this could be on 3 sides. I believe this would have audible benefits for the mid/high end.
With the proposed changes above, to keep the line & stub the same length, minor adjustments in total height & line layout would likely have to be made. A tilt back for the whole enclosure or only the section where the drivers are mounted are also possible.
Thoughts from anyone who has built or studied the TL version of this design?
PS: I'm still deciding between the 10F or an @augerpro 6" WG equipped SB26ADC + @Patrick Bateman meta-absorber back. Obviously the latter will require major changes to the high pass section. I hoping to cross the SB26 at ~1500Hz , but this probably not work with 1st order. Which then tosses out "transient perfect". 🤔
1. That trapped 5x5x8.5" space near the bottom bugs me. I can't help asking why the line wasn't done conventionally -- after the back portion of the line, have it go up, then back down and out through a port at the bottom of the front panel? This would add 5~6" to the line.
2. What adjustments to the line would have to be made if the tweeter is mounted on top & woofer mounted below? I would like to use 1.25" 1/4 round router bit around the tweeter's front baffle perimeter. If positioned to the top of the baffle, this could be on 3 sides. I believe this would have audible benefits for the mid/high end.
With the proposed changes above, to keep the line & stub the same length, minor adjustments in total height & line layout would likely have to be made. A tilt back for the whole enclosure or only the section where the drivers are mounted are also possible.
Thoughts from anyone who has built or studied the TL version of this design?
PS: I'm still deciding between the 10F or an @augerpro 6" WG equipped SB26ADC + @Patrick Bateman meta-absorber back. Obviously the latter will require major changes to the high pass section. I hoping to cross the SB26 at ~1500Hz , but this probably not work with 1st order. Which then tosses out "transient perfect". 🤔
You mean replace all the drivers with SBAs? That makes it a completely different speaker, no? @xrk971 repeated often that RS225 is an essential component of this design... even though the design was originally defined as a fullrange assisted by a woofer. That description puts more emphasis on the former -- ie, from that perspective, the 10F really is core.
It would put the vent even farther from the woofer. Trying to keep the spatial coherence. It could work with folding as you say, just keep the length the same and taper ratio the same.
If you want the full range tweeter above, it would need to be in its own little enclosure and have a 3in step recessed behind the woofer. This will change he the XO completely.
The fullrange tweeter is not as critical as the woofer. Although, if you are going to change this by putting tweeter on top, the crossover is totally different.
I haven't looked if a WO or SB model number could work. My MW19TX-8 is M much more than W. I was able to add some ~50hz hurump resonance to fill in the deep trough below otherwise super clear bass >60hz.... The RS225 tapered TL eyeballs to ~2.3m; 3.1:1 taper effectively expands its length 1.27X (per MJK Table 1 redux) to ~2.9m; quarterwave ~29hz. (My TLonken 17L 1.5m ~40hz was too low for the TeXtreme.)
... It just occurred to me, I have several different aluminum fullrange/woofer drivers and they all serve(d) as the W in a WAW-like way (doh!). My "reference" commercial speaker is the Monitor Audio Studio 2 (liter?) port-plugged and assisted by 8" Mo drivers placed over 25L cans (umbrella stands) with 1st-order low-pass tuned by ear. (The flagship Studio 60 was indeed a 2-way plus woofer all 1st-order; mid not high-passed.) This combo beat out Jamo 8" subs (flipped to face front) that I used for many years here in Beijing. Recently I got the Mark Audio Alpair 10.3 and (resuscitated) MAOP 5 for making WAW. And before, alumina (Al2O3) woofers to assist Alpair 5.3 or putative ceramic dome tweeters. Finally, JX92S not used as fullrange. Hmm, aluminum makes for better woofers than mids/highs?
Hi, when adding up the nearfield measurements of the woofer and the port im seeing a dip in spl around 80hz the separate measurements of the woofer and the port don’t show this. Is this a phase issue as result of wrong stuffing? Talking about the rs 225 TL
Do you see the dip with a mic (at 0.5m) on axis of woofer full frequency range measurement from 10Hz to 20kHz?
A dip from “adding” up sounds like you are doing it mathematically. Or is this when combining both woofer and midtweeter in reality?
A dip from “adding” up sounds like you are doing it mathematically. Or is this when combining both woofer and midtweeter in reality?
No one, it’s just a distance where I know the room interactions (and floor bounce cancellation effects) are minimal but useful for purposes of developing a crossover.
yep, perfect for "universal" XO.
I've been making XO for my own room for a while, so I have been taking into account distance and room interactions.
I've been making XO for my own room for a while, so I have been taking into account distance and room interactions.
On axis with the woofer it does not show but i also made a near field measurement of the port and when combining both the woofer and the port it dips at 80hz. Both nearfield measurements don’t show that dip only when combining.
Im not building it with the midtweeter. Using a compression driver with a horn instead
Ps my knowledge is very limited as this is one of my first projects
If you are not using a full range mid tweeter and using a compression driver, you are probably not getting the benefit of a FAST - coherent phase through the midrange where spatial imagining is important. But that’s ok - it is a different speaker and you are using the woofer in TL for the bass. Thats fine.
Is it second order on the JBL 1" compression driver, too? I have used 3rd order at 1kHz on 1" Radian compression driver, but even then 1kHz may be stretching it a bit. I now use 1.4" compression driver.