Having SB20FRPC30-8 & Wavecor wf182bd07(4Ohm). Currently using the wavecor in a 2 way with the wavecor tweeter TW030WA08. Would be cool to make a MLTL - But also don't want it too big (wife friendly) 😊 "Don't have PC so can use those fancy programs I read about a lot are using"
Regards Tomas
Regards Tomas
Thought of a wide box about 40cm, Height 65cm and a depth of 26cm. So wanna know if I could make it work in this cabinet? The mid/bass doesn't ask for a lot of volume. I have 2 amps so wanna use 1 for Fullrange and the other for the bass. Also I prefer it could be close to the wall. Not sure what I should say sorry 🤠First post... I read a lot of the posts on this forum though 😂
I don't think that wavecor is fit for a MLTL, or any TL as the QTS is to low to fit that alignment. It's more fit for a relfex or a backloaded horn. An MLTL will be very large in any way you design it, and a good MLTL will be hard to get with this driver.
For a waw it's certainly fit.The SB also, but for help designing it you'll have to give more info about what you want, what amp, room, wishes on sound, ...
For a waw it's certainly fit.The SB also, but for help designing it you'll have to give more info about what you want, what amp, room, wishes on sound, ...
Well, those dimensions aren't really suited to an MLTL / MLQW unless folded anyway. Being quarter-wave variations, the physical dimensions (length) are a functional part of the tuning, so if you remove that, you've got (more or less) a stock Helmholtz variation. For e.g., using the values published here https://www.costruireaudio.com/en-gb/wavecor-wf182bd07-woofer-4-ohm-17-cm.html and assuming 0.5Ω series R for typical wire-loop, connection losses, then one near-as flat (slightly tickled gain) MLTL, with the driver at a typical ear-height & rounding the dimensions to the nearest sensible Imperial values, would be:
L = 56in
W = 14.375in
D = 5in
Zd = 19.5in
Zv = 47.5in
Av = Sd
Lv = 0.75in
All internal faces lagged ~1in bonded acoustic fibreglass board, BAF, SAE-F10 felt or a near-equivalent & adjusted as desired via the old click test.
Rather larger than the desired dimensions above though unfortunately.
L = 56in
W = 14.375in
D = 5in
Zd = 19.5in
Zv = 47.5in
Av = Sd
Lv = 0.75in
All internal faces lagged ~1in bonded acoustic fibreglass board, BAF, SAE-F10 felt or a near-equivalent & adjusted as desired via the old click test.
Rather larger than the desired dimensions above though unfortunately.
Okay and thanks Waxx. But what about the SB alone in the mltl cabinet? Have an L-Shaped livingroom, wanna use it for music (pop, rock & rap) and TV. Using the the "Square" part of the room 5x5 meters. Really like my 2- way speakers - but think they lack a bit of volume in the midrange. Have a cheap Tangent preamp 2 & powerampster 2 + Icepower 200as2. Hope it helps and thanks for the help.
Regards Tomas
Regards Tomas
When you say 'they lack a bit of volume in the midrange' -how are you defining the midrange? As far as loading is concerned QW is like any other back-loaded bass enclosure in that it's only functional in the LF, so unless there's something drastically wrong with the existing box and / or its interaction with the room, it shouldn't really be affecting the midrange per se in that sense. You may be having some losses via a narrow baffle, and running out of steam due to the efficiency drop & need to compensate in the low-pass, but that's an effect of baffle dimensions rather than the enclosure's acoustic load. Assuming you've sufficient LF headroom, then you may want to look at adjusting the crossover to see if you can get the midband output up a bit.
That can work (but i'm not near my computer with sim software), but it will also be bigger than what you wish. Reflex (waw or single fullrange driver) fits more to what you want on size. A MLTL will be tall, and in both cases quiet big on floorplan also. The SB MLTL will be only a bit smaller than the wavecor i think, if i look at the specs. For simulation you'll have to wait untill i'm back home (tomorrow maybe).
Several IIRC, but being a middling Q, middling Vas, middling Fs driver, it needs a reasonably sized cabinet as far as QW loading is concerned, so if that's what's wanted, we're coming up against those dimension limits again since it's those that ultimately generate the eigenmodes / standing waves. I'm not convinced a given bass loading scheme is going to give the extra midrange wanted though, so as I say, I'd probably making looking at the existing crossover my first port of call & go from there.
I meant both drivers in a single MLTL or each have their own MLTL or .........?
Not sure i explained that correctly - Think it's more like I want a boost/more midrange. It's a good 2way setup imo. Crossed at 1800 if i remember correct.
Thanks again for your advice 😊
Regards Tomas
OK, I've done a couple of MLTLs for the SB and posted at least one of them, though they're same height as SM's Wavecor, but bigger in WxD for more bass output, though will work in his, just will lose some output in the ~40-120 Hz BW.
That said, the Wavcor ideally needs to be in the MLTL with the SB above it, so either designed as an averaged spec dual driver MLTL (bigger WxD) that's obviously a compromise or as a folded end loaded one with the SB in a sealed chamber above it.
Obviously these can be made 'skinny' with a rolled off bass, but nowadays the way to go is a separate (multiple small) sub system to get a 'solid'/'full' performing bottom end below ~120 Hz.
Right, that's why I say, an MLTL isn't going to give you that -no back loaded cabinet is, as the box ceases to have any meaningful output above ~120Hz or so. Assuming the midrange is categorised as 300Hz - 3KHz (or 200Hz - 4KHz for 'safety'
) then you need to look at other ways of manipulating the response. In this case, potentially the crossover depending on what the system response currently looks like.