Originally Posted by
saabracer23
Efficiency isn’t necessarily all that crucial. I’m sure anything that is built will be plenty efficient. The room is about 16’ wide and 23’ long. There is plenty of amplifier power, while running active each driver will have 300-400 watts each depending of the amplifier dedicated to that driver. If I get the passive crossovers setup I’ll then switch over to some Yamaha amplifiers I have rated at 925w at 8 ohms and 1400 at 4 ohms, so plenty of power.
Fir frequency response I’d like them to be a true full range speaker, for music my thoughts are running the speakers only so hopefully they’ll make it to 30hz (-3db) or so give or take a few hz. If I’m really in the mood for bass I can kick in the sub1500s as I’m sure they can do music justice. For HT the plan is to kick in the 18s and cross them to the mains at somewhere between 50-70hz. So these main speakers will start rolling off at that crossover point. Cabinet size would be whatever is optimal for the drivers picked. They’ll likely be behind an acoustically transparent screen/wall. The 18” sub cabinets will be 14 cubic feet afrer subtracting port and driver volume, so pretty large.
“Depending on what you want to your design to do some drivers might suit and some might not.”
Basically I’m after the 10” mid driver that will give me the cleanest most coherent midrange, where vocals will be as clean as possible. If at the same time they can give some good impact in the midbass region that would be a plus, but I’m sure the woofer they cross to can handle most of that if needed. Same goes for the woofer, I would hope for tactical clean bass with very little decay. I don’t want boomy, but I know that has a lot to do with the cabinet. On the tweeter, nobody has said not to use the Heil, so I may just go with that. I really like it, it’s fairly efficient and sounds good while being able to being able to cross low. I’ll have to double check, but I may have the mid and tweeter from the SK2-3300 as well, maybe those would be a better option than the Heil?
Indeed you are correct, building test boxes and taking measurements with REW would get me the answers I need. With twins that are a couple months old at the moment my time is externally limited, so if there was someone that had some time with these drivers I figured they might be able to save me time. Like I know there is a member here with a 3 way using the Heil with a 2251J and an 18 (not sure which 18). He could share his thoughts, cabinet volume, crossover frequency and slope, etc. Someone recently asked on another forum if there was anyone that preferred the midrange of the Scan Speak Revelator 12M4631 or the Seas W14CY001. I told him that sound is obviously subjective, but I much preferred the sound of the paper cone Scan. I shared my crossover info with him along with the other drivers used. Hopefully I was able to save him a bit of time. If I have some info he is looking for, why not share it?
Od course if in the end I can’t get definitive answers then I will indeed build test cabinets and measure, but it would greatly delay my progress. Do you happen to know if two screaming babies would mess up my measurements of the frequency response lol?
Yes, this Heil was used in a 2 way matching up to a 12” woofer and a passive. Most of the designs were 2 ways using a passive, but they did have the Rock Monitors like the Rock Monitor 3 which was a 3 way using a 6” mid.
Do you have any thoughts as to my question on my last response for the sub1500? As far as saving it from glue failure and truly the best cabinet alignment? I have DATS and a WT3, but again, if it can save me a little time…
Yeah, the MTM idea was just a passing though. Im not sure how the Heil would behave with a cabinet for the mids both on tap and below it, as it’s also rear radiating. Plus the center to center spacing on the 10s may not be ideal with the Heil between them. The more I think about it, the side by side may look better. Maybe make the front baffle as it was in the 2SK-3300, mounting the drivers on a slight slant away from each other. Did they do that to eliminate combing and improve horizontal dispersion? My last home speaker design was in a D’appolito configuration using a pair of 5-1/4” midwoofers and a 1” dome tweeter. So I was just curious if would work here.
I will keep my eyes open for a JBL drive rack, thank you!
Appreciate it!
Dan