After pondering my requirements (and constraints), this configuration is starting to appeal to me...
Before I dive in to learning the amazing CAD tool, can I ask a few questions to give me guidance?
Before I dive in to learning the amazing CAD tool, can I ask a few questions to give me guidance?
- What sort of T/S specs should we be looking for when choosing a driver?
- Could there be compromises/challenges with having a fairly long box (ie 90-120cm) to bring that horn loaded hump down the spectrum?
- Would it be worth looking at filler or damping at the closed end, to address the cancellation notch?
If you are looking to build a "subwoofer", chose size 15" or 18" and start with average driver with aluminium chassis, xmax equal or above 10mm, FS close or below the tuning frequency you targeting (<40Hz), QTS below 0,4. From there you decide the direction you want to improve and how much you want to pay for the driver.
Yes, that hump is defined by the front horn length.
I think not, I'd go with this design if you are looking for a subwoofer and in this case you going to crossover with tops below the cancellation, if you are looking for a kickbin, it would be better looking for a layout where the driver is not offset with front load horn, like the the models below and choose 12" or 10" driver size.
https://freeloudspeakerplan.rf.gd/pages/wmx.htm
https://freeloudspeakerplan.rf.gd/pages/wlx.htm
All those models are 6th order band pass parallel like manifold. The front horn has no offset and they have different layout and for this reason you can achieve different size ratio, if that is important for your use case. The con for those two models is that you are going to need a removable panel to install the driver.
I have recently been spending a lot of time in Hornresp to come up with a single sub solution for live sound use, crowds up to 200 indoors.
Given the number of segments I needed, I modelled this as an offset driver with a rear vented chamber. Dimensions are 825x825x570. Gross volume is 390 litres.
This appears to give a very good size to response ratio. Excellent sensitivity and useable 40hz response.
Any thoughts, folks?
Given the number of segments I needed, I modelled this as an offset driver with a rear vented chamber. Dimensions are 825x825x570. Gross volume is 390 litres.
This appears to give a very good size to response ratio. Excellent sensitivity and useable 40hz response.
Any thoughts, folks?
Nice! I like the fact that storing the cabs like that don't do cone sag! And the layout looks great !
im always amazed at what some of these combos do with added resonator. Everything is boosted 💚
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Hello @laxandredeyed
Considering that you don't go the original design, why not building the original layout of MHB where you don't have the offset drive and so improved extension? The alternatives, but little more complex design to build would be WMX and WLX layouts.
https://freeloudspeakerplan.rf.gd/pages/mhb.htm
https://freeloudspeakerplan.rf.gd/pages/wmx.htm
https://freeloudspeakerplan.rf.gd/pages/wlx.htm
If easy to build is your target, I would go Paraflex Type C because cooling is important for subwoofer and you save some money/time in the build process.
https://freeloudspeakerplan.rf.gd/pages/paraflexc.htm
Note: post #7 has the SPL comparison with the paraflex with the same volume as Manifold and as TH. See the link below.
@LORDSANSUI build simplicity is a definite consideration here. Playing with the other designs you mentioned, it seems the only improvement in response by avoiding the offset driver is higher in the passband, well above the crossover frequency. I suppose symmetrical loading of the driver would be an advantage.
As for cooling, what are your thoughts on having the reflex ports close to the driver's motor? Would this improve cooling by an appreciable amount?
As for cooling, what are your thoughts on having the reflex ports close to the driver's motor? Would this improve cooling by an appreciable amount?