So i have x4 Vifa 12in woofers and i want to use them in a speaker build.
these are the part numbers for them its M30wo-15 and they are 4 ohm.
I cant find specs for them anywhere except a similar version the M30wo-49-08 the differences are that its 8ohms and has a double magnet system but except from that they use the same chassis(magnesium), cone(coated paper) and surround(rubber). i will put an image of them.
Anyway i what to use 2 of these woofer per tower for a the woofer part and wired up to make a more friendly 8 ohm and want to use a Vifa D27 or D20 as i got 2 stored away both 6ohm
The main parts that i am struggling with is that i don't know the sensitivity of the woofer and the specs for the similer one is 93dB
and i cant did a mid that has that kind of sensitively to match.
I'm going to get a Dayton audio DAT to take some parameters of the woofer (also needed for other project). idk how far that's going to get me but hopefully this will help me find box size.
I'm thinking on have the crossover point about 400hz and 2600hz. and preferably sealed, prob not possible but down to 40hz ish
Vifa M30wo-15 (what i have)
Vifa M30wo-49-08 (the kind of similar one)
both look like they have a pole peace vent but they do not its just a pre drilled hole that doesn't go through.
i got them for 25 pounds each witch i think is quite good. and if all fails i can use them for a sub.
Sorry for the large amount of writing
Any help would be largely appreciated.
these are the part numbers for them its M30wo-15 and they are 4 ohm.
I cant find specs for them anywhere except a similar version the M30wo-49-08 the differences are that its 8ohms and has a double magnet system but except from that they use the same chassis(magnesium), cone(coated paper) and surround(rubber). i will put an image of them.
Anyway i what to use 2 of these woofer per tower for a the woofer part and wired up to make a more friendly 8 ohm and want to use a Vifa D27 or D20 as i got 2 stored away both 6ohm
The main parts that i am struggling with is that i don't know the sensitivity of the woofer and the specs for the similer one is 93dB
and i cant did a mid that has that kind of sensitively to match.
I'm going to get a Dayton audio DAT to take some parameters of the woofer (also needed for other project). idk how far that's going to get me but hopefully this will help me find box size.
I'm thinking on have the crossover point about 400hz and 2600hz. and preferably sealed, prob not possible but down to 40hz ish
Vifa M30wo-15 (what i have)
Vifa M30wo-49-08 (the kind of similar one)
both look like they have a pole peace vent but they do not its just a pre drilled hole that doesn't go through.
i got them for 25 pounds each witch i think is quite good. and if all fails i can use them for a sub.
Sorry for the large amount of writing
Any help would be largely appreciated.
So, you'll wire them in series for a sensitivity that remains equal to that of a single to maintain the 8 ohm load you want.
Let's say it is 93dB, and they are positioned vertically below mid and tweeter. This means the one adjacent to the floor will get full BSC due to the floor boundary load. However, the one above it will not. Being that, let's look at this as still needing a couple dB of compensation for baffle step in the xover, yielding 91dB. Insertion loss for the xover could take 0.5 to 1.0dB more away for an approximate 90dB net sensitivity of the woofer pair.
Guessing a xover of 400-500Hz to 2.5k as a guess could yield a dB of bandpass gain for the midrange, so a mid of 89-90dB would likely be spot on. There a good many pro style midranges in the 4-6" size format that will likely meet your needs, and still have to be padded down to match that of the woofers.
Let's say it is 93dB, and they are positioned vertically below mid and tweeter. This means the one adjacent to the floor will get full BSC due to the floor boundary load. However, the one above it will not. Being that, let's look at this as still needing a couple dB of compensation for baffle step in the xover, yielding 91dB. Insertion loss for the xover could take 0.5 to 1.0dB more away for an approximate 90dB net sensitivity of the woofer pair.
Guessing a xover of 400-500Hz to 2.5k as a guess could yield a dB of bandpass gain for the midrange, so a mid of 89-90dB would likely be spot on. There a good many pro style midranges in the 4-6" size format that will likely meet your needs, and still have to be padded down to match that of the woofers.
I know that this is not a pure midrange but i can get them cheaply and easy where i am. what about a peerless SDS-P830657 as the midrange. i have seen them used in high-end designs i looked at the Frequency Response the 60 degrees response does not look great.
i also believe that the DAT software can give a simulated sensitivity based of parameters. would that give a close enough result to get a good guess
i am also a mission speaker fan so i like what people call mission sound.
i also believe that the DAT software can give a simulated sensitivity based of parameters. would that give a close enough result to get a good guess
i am also a mission speaker fan so i like what people call mission sound.
Is it your first DIY speaker ? three way is hard to make, although you are not a beginner.
These drivers are looking to be old high end driver (magnesium chassis). You should measure T/S to see if you can put them in a closed box.
See pro midrange, you need high sensitivity.
Faital 6RS140
18 Sound 6ND430
....
These drivers are looking to be old high end driver (magnesium chassis). You should measure T/S to see if you can put them in a closed box.
See pro midrange, you need high sensitivity.
Faital 6RS140
18 Sound 6ND430
....
I know very well its little brother 830656, very good driver not low distortion but very good balanced, vivid and realistic as midrange, see the speaker in my avatar 😉.
In France DIYs are fund of this 5.25" for the quality price ratio good sound you have for the price. A good match with the DX25.
The 830657 should be in the same line, good driver and easy to work with. unfortunately I didn't use the6.5", 8" in this series. For 20$ you don't take a lot of risk.
With two 12” woofers in a tower at the bottom, one above the other?……then add a .5 inductor to the bottom driver…..the center to center spacing of the lower woofer to a midrange of 4/5” inches puts you outside the 1/4 wavelength at 400hz, more so at 500.
Personally?…..I’d build a WMTW……more cohesive for a home environment and less like a sound reinforcement application…..just sounds more refined. Keeps the 1/4 wave issues away as well and saves you a few $$$ on a heavy inductor.
Personally?…..I’d build a WMTW……more cohesive for a home environment and less like a sound reinforcement application…..just sounds more refined. Keeps the 1/4 wave issues away as well and saves you a few $$$ on a heavy inductor.
I fail to see why a 1/4 lambda is required for xover freq as CTC. This would leave a 7" 2way with 6" CTC with an unobtainable good xover point due to spacing. 6" = 2260Hz. You can't xover a 7" 2way at 4x that frequency. I've fudged CTC by an inch in some cases, as have others to where a 3kHz xover with this same criteria has been acceptable.
400 = 34", I think the xover will be fine without having to use a 3.5way setup. A 3way will be fine.
400 = 34", I think the xover will be fine without having to use a 3.5way setup. A 3way will be fine.
i just bought the dayton audio DAT it take like a week or 2 to show up but i do think ill use the peerless SDS-P830657 as my mids its cheap and if it doesnt work out i can still get something else.
if it works better i could set the woofer xover lower mabe 250hz if its works out better
what order xover would you recommend
if it works better i could set the woofer xover lower mabe 250hz if its works out better
what order xover would you recommend
i was just going to put the mids in a sealed box but what about open baffle and how would that effect the mids
once i get the mids and use the DAT to get parameters of the woofer ill update here but idk how long that's going to be
I'm also so thankful for the input its has helped
once i get the mids and use the DAT to get parameters of the woofer ill update here but idk how long that's going to be
I'm also so thankful for the input its has helped
If you have a D27 tweeter why not use a Vifa midrange?
You should be able to find a good 4inch/110mm Vifa mid. If you could get a P11 or PL11 I think that should be ideal.
Even the P-13 or PL14 I know discontinued but there should be stock around
Those woofers should be fine to around 400Hz
EDIT
https://www.falconacoustics.co.uk/vifa-pl14wj0908-woofer.html
You should be able to find a good 4inch/110mm Vifa mid. If you could get a P11 or PL11 I think that should be ideal.
Even the P-13 or PL14 I know discontinued but there should be stock around
Those woofers should be fine to around 400Hz
EDIT
https://www.falconacoustics.co.uk/vifa-pl14wj0908-woofer.html
1/4 is ideal…..phase quadrature, and any lobing within the XO region will be fwd instead of tilted toward the longer wavelengths within the front. Everything of course is a compromise and we pick and choose the one’s we‘re willing to accept. Perfect power response is the pinnacle.….and with each additional drive unit and crossover point we move farther and farther away from it……..my mantra is why crush the flowers under foot as we go zigzagging along?….walk the path
How about Audax PR17, it has high sensitivity and can cross low enough. https://www.falconacoustics.co.uk/a...sm-pr-17hr37-pr17hr60-pr17hr70-pr17hr100.html
yes i using the Vifa Peerless D27TG-35-06 not the D27TG-45-06 as i think they stop making them. but i believe the only difference is the faceplate
Some internal differences and the Fs is lower on the D27-45 so it can be crossed much lower; in my case a simple first order cap, but in combination with the P-13 used straight but Digitally crossed at 300Hz. The 35 probably really needs a second order XO as per the Vifa design sheets
its all going to be a passive crossover for all of it.
and everywhere i look the D27TG-45 is out of stock everywhere and says its discontinued and i don't fancy going 2nd hand as they wont a pair
and everywhere i look the D27TG-45 is out of stock everywhere and says its discontinued and i don't fancy going 2nd hand as they wont a pair
Just keep in mind that almost all of the older Vifa tweeters with the "butterfly" coils have interchangeable parts; I've done many swaps with older Vifa tweeters and replacement voice coils are relatively cheap.
Whatever you choose to use as a midrange those are very good woofers to around 300 or 400 but I'd use them as low as possible just because that's my design philosophy
Whatever you choose to use as a midrange those are very good woofers to around 300 or 400 but I'd use them as low as possible just because that's my design philosophy
i can see where you going and i might put the xover lower like 250 300hz but i am still trying work it all out and need to wait for parts. plus i got no solid spec on what sensitivity of the 12in woofers are but i guess get some form of idea with the DAT (i know it doesn't do sensitivity but it can take a simulated guess at it)
and missions philosophy was to keep the xover as simple as possible so I'm trying to do that.
and missions philosophy was to keep the xover as simple as possible so I'm trying to do that.
T/S Equations and how each one affects the others :
n0 and SPL rating – Efficiency
no is a percentage, showing how efficient the driver is at converting an electrical signal to an acoustical one. As a result, the bigger the number, the greater the reference sound pressure level.n0 = (9.7822 * 10-10 * Vas * Fs3) / Qes
- n0 above is a ratio, not a percentage. To make it a percentage multiply by 100.
- Vas is in liters.
- Fs in Hz.
The SPL rating is in direct proportion to n0. Important to note is that the efficiency coefficient (n0) is highly dependent to the resonant frequency, because it’s at the power of 3. In conclusion, tweeters and mid-range drivers will be more efficient versus subwoofers.