Hi all,
Some of you may remember I have a set of 4 15w revelators and pair of 66000 aircirc tweeter which I was planning on building into a 2 way MTM tower at some point in the near future. These drivers were removed from YG acoustics Anat II loudspeakers.
I have since been offered the 26w/8861 woofers to go with them (4 available), but am not too keen to be honest, from a technical point of view it seems very difficult to get the required response from them (i.e. flat below 100Hz as far as far as possible) and aesthetically the collosal size difference between the 15w's and 26w's is hard to make work in an enclosure (suggestions are welcome)
Main questions:
- Can you think of an enclosure/design format that would look good and sound good as a starting point for this design?
- Can a kind soul work out if there is any way to get these to take over from 100Hz, and dig as deep as possible? given there size I'd have thought 20-30Hz reasonable to expect - suggestions of filter and or encolusre would be welcome, I don't have the modelling experience I need yet!
- If you were in my shoes, would you leave it, get 2, or get 4, and why?
- any idea on what these things are actually worth? I think the asking price is a little high for used drivers but would like others opinions.
Some of you may remember I have a set of 4 15w revelators and pair of 66000 aircirc tweeter which I was planning on building into a 2 way MTM tower at some point in the near future. These drivers were removed from YG acoustics Anat II loudspeakers.
I have since been offered the 26w/8861 woofers to go with them (4 available), but am not too keen to be honest, from a technical point of view it seems very difficult to get the required response from them (i.e. flat below 100Hz as far as far as possible) and aesthetically the collosal size difference between the 15w's and 26w's is hard to make work in an enclosure (suggestions are welcome)
Main questions:
- Can you think of an enclosure/design format that would look good and sound good as a starting point for this design?
- Can a kind soul work out if there is any way to get these to take over from 100Hz, and dig as deep as possible? given there size I'd have thought 20-30Hz reasonable to expect - suggestions of filter and or encolusre would be welcome, I don't have the modelling experience I need yet!
- If you were in my shoes, would you leave it, get 2, or get 4, and why?
- any idea on what these things are actually worth? I think the asking price is a little high for used drivers but would like others opinions.
Personally I think once its used it shouldn't cost that much above half off for any currently made speaker if it is in great condition. That's a great opportunity as I'm looking for 1 26w/8861 myself. I plan on building Troels Jensen 1071.
Hi Guys
kbzx35 - Would happily send you one but including shipping to america it and currency converstion it would work out at about $270!
Face - I wouldn't crossover at 100Hz, It's a guess at roughly where the bass woofer would need to go up to, as the MTM would go into a sealed enclosure, leading to an effective crossover frequency between 52Hz and 75Hz, though it wouldn't be 'crossing over' as such as the mid units would still only have an electrical low pass. (my gut says the woofer would need to go up to about 80Hz effectively, and ideally I'd like it to go down to 20Hz in a sealed enclosure, but the only way I can think to do this is with massive EQ and an active set up)
kbzx35 - Would happily send you one but including shipping to america it and currency converstion it would work out at about $270!
Face - I wouldn't crossover at 100Hz, It's a guess at roughly where the bass woofer would need to go up to, as the MTM would go into a sealed enclosure, leading to an effective crossover frequency between 52Hz and 75Hz, though it wouldn't be 'crossing over' as such as the mid units would still only have an electrical low pass. (my gut says the woofer would need to go up to about 80Hz effectively, and ideally I'd like it to go down to 20Hz in a sealed enclosure, but the only way I can think to do this is with massive EQ and an active set up)
Because of the different mechanical characteristics (Mms, Qms, Rms etc) of the drivers will cause a negative result if done in this manner.
If all drivers were the same just crossed at different points this will not happen.
Nanoo,
Why not cross above the cutoff frequency of the sealed enclosure above where GD rises. This would lower GD to a much lower point where the 26w's woofers have control.
I figured shipping would be expensive. Troels has them crossed at 200 hz and raves about this woofer. If you get them and not using one, I still may be tempted to grab one from you. =)
Do you mean cross higher and run a high pass on the mids?
(which would make sense in many ways, was just trying to avoid the hassle of a 3-way design... though the active crossover would do that anyway, so things kind of fall into place a little.
GD - sorry I have no idea what GD is... General distortion? I'm gussing not...
Sealed boxes exhibit GD at a higher frequency than anything else. Crossing above the point where it rises would nip this in the bud and reduce doppler effect cleaning up the mids nicely.
That's great, but still leads me with the problem that:
a) what on earth should the cabinet look like for a WMTM?
b) do i really need an extra woofer that big? MTM based floorstanders should dig down to 40Hz when ported, surely I'd need a HUGE listening room to warrant the extra bass drivers?
a) what on earth should the cabinet look like for a WMTM?
b) do i really need an extra woofer that big? MTM based floorstanders should dig down to 40Hz when ported, surely I'd need a HUGE listening room to warrant the extra bass drivers?
A)The woofer could be side, rear or even bottom mounted, so depending on crossover point the choices conger up a myriad of possibilities 😉
B) this is the right question to ask. How big is your room? There would be advantages to doing it this way, but sometimes we don't truely need to go that far. Example, the 6.5" midbasses I'll be using dig down quite well for my purpose hitting 30Hz in a MLTL. I'll be actively crossing them over at 27Hz to limit excursion. Living in an apt. leaves alot to be desired, when I can listen and how much grunt do I need to apply before they complain? A sub necessary? I don't think so. 🙂
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