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The baffle and wings sit on a base that is 16cm deep, and it is enough, though with dogs or kids ruining amok I'd go a bit deeper.
Deeper wings...I was a bit worried about cavity resonance, and didnt really need deeper, but it might not be a bad idea to go for a sort of U-baffle. No body over at the Hawthorne forum seems too keen on wings though, which kind of swayed me.
The Behringer should more than cover your room problems. I'm using all 12 of the infinitely flexible parametric EQ bands to flatten up to 200hz, and then there are all GEQ's if you need more.
I'm interested in the dampening for the AE Dipole15 drivers you mention, what kind of dampening are you talking about?
The Hypex UcD400 was my first choice of amps, but I ran out of funds. The Bastanis dealer here in Oz is a big fan of them. Why not build the power amp version and use PC XO? I've been wary of using plate amps with outboard EQ thinking I might be introducing excessive latency, but I dont know.
Can I post pictures here? otherwise pm me an email address and I'll send you a pic, and a sketch for a trapeziod baffle I had planned to do, before my wife put her foot down for reasons unknown.
This is interesting. There will be very little to choose between them./Erling
Yes, the choice would be between the Augies and the Dipole15. The IB15 it's not really up to the task. Could you post the response of the Dipole15?
If I remember correctly Augies costs $150 each and IB15 about $257,
If I remember correctly Augies costs $150 each and IB15 about $257, this price differential IB15 must be clearly be better in the sonic quality(subjective)if I were to buy them, having greater Xmax should not the only reason. How often listeners listen at such a level until xmax is reached?MJK has shown even drivers like Alpha will give excellent without spending heaps if designed properly, other alternative drivers include those from Goldwood drivers which give execellent performance at relative cheap price.
No, I will not do the Dipole15 simulation as this is not asked for in the thread and therefore not of common interest here. It would also be against the general interests of MJK who is providing this software for a very diminutive fee. For the IB15 and Hawthorne Augie I have been providing these simulations before./Erling
It looks like I'm a little late to the party again, but lets look at a few things. First, simulations can help with the design goals, but in room results will always vary some unless the simulation would take into account absolutely everything, which it can't. We'll break down each section to get the best results we can though and see what is happening at each point. We can get a good idea what the baffle itself will do and the drivers will do, but placement in the room will also factor into the real world results. I think it's important that in the open baffle world, you are going to need some kind of EQ or filters to compensate for the baffle rolloff no matter what you do. We'll look at that a little farther down though.
Does anyone have full parameters for the Augie 15"? It's really difficult to measure accurately without knowing Mms, Cms, Sd, and Bl. All the other parameters are derived from these. Without them we can't determine excursion accurately or max SPL levels. In the interest of moving on though I'll make an assumption that the Augie 15 has the same Sd as the OB15. We can always correct it later, but this will give a good start.
That said, if 30hz is the main goal for low end response and the upper end is only around 100hz, the OB15 would be my driver of choice. This is going to give you some extra efficiency up higher where you need it. They can cleanly do 500hz or higher so there are no issues with the upper end response. That said, we'll get a start on the comparison of drivers and output levels. This will compare drivers only, not their open baffle response yet.
The Edge calculates only the baffle effects and nothing else. I'm looking at a 450mm wide x 800mm tall baffle. This will not calculate the floor effects but will give a good idea of the rolloff that is mostly determined by the more narrow 450mm width.
Since we are only concerned with 30-100hz in this case, we can just concentrate on that region. You can see the response is approximately -10dB at 30hz, the point we picked as the low end requirement. This is the same no matter which driver we're talking about. Subtract that from the infinite baffle model and you can see that the max SPL at 30hz for the Augie is about 95.8dB with that 55W max input power when reaching excursion limits. At 55W input, the OB15 has nearly identical output at 30hz, but again you can throw 400W at it before reaching the 18.5mm excursion limits, allowing you to reach 104.4dB for the single OB15.
Now, if you are using an active loudspeaker management system like the DCX2496, Driverack260, DEQX, Dolby Lake, etc etc this is something you can easily compensate for. A simple parametric EQ on this woofer section can compensate very well also.
