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Hey Squid, The Hestia Grand? I think she will like that! No problems with the plate amps concerning crossover points, as the active x/o is independent of the impedance load the amp sees. What's not independent however is the amount of power the amp will produce at either 4 or 8 ohms. A 500 watt amp may produce 500 watts @ 4 ohms but may only produce a little over 250 watts @ 8 ohms. Therefore two separate amps at 8 ohms per side, may not "see" much more power than two 8 ohm drivers wired in parallel to one amp (4 ohms total), if that makes any sense? You may want to give some thought to the baffle dimensions with the PA310. The PA310 (a 12" bass driver) is larger and will require more real estate to address dipole cancellation. The 15" wide baffle may not work in your case... you may need to look at an 18-20" width instead which may also negatively impact the speakers imagining characteristics up top. The 12" drivers Fs is only 2 Hz less than the 10", so you will likely not notice any deeper bass, although it will move a larger slug of air. It also has a higher MMS rating which will likely result in more baffle noise (vibration). I would encourage you to experiment with the design. Just wanted to point out a few things so you don't wind up paying more and getting less.
I very much like your design and appreciate your design philosophy. I plan to build a pair. I read another thread where you responded to someone who wanted a top end to go with his subs. You recommended the top end of the Hestia. Another poster recommended using the SEOS waveguide and Denovo DNA-360 CD with a "pro 12 inch woofer". I have the SEOS and Denovo and have been looking for weeks for an OB design incorporating them or similar parts. I understand how the bottom end of the Hestia could fairly easily be substituted but could the Vifa tweeter be replaced with the SEOS waveguide and Denovo CD without totally redesigning the project? The DNA-360 is SPL: 108db 1W/1m and the crossover is minimum 1000hz. It is similar to the B&C DE-250. I could provide more info but since this is my first post I probably shouldn't be touting other sites. In any case I will be buying the Vifas when PE has them back in stock and buy three pairs of the very affordable MCMs to lift the tweeter and mid a little higher off the floor. Thanks for a very interesting plan.
I like the idea of a tapered baffle if you are considering a 12" LF driver. Also, Have you considered two 10's as an option? This would allow you to keep the same baffle width and raise the mid/tweeter pair to a more normal seated height. I would be tempted to use all MCM drivers in that case, taking advantage of the quantity pricing on 4 or more. I just built a 2nd Hestia for someone else using the MCM driver in lieu of the Dayton. They measure extremely close, to the point where it's hard to justify the difference in cost. Also remember to look for promo codes. These will often save you 10-15 percent and sometimes free shipping.
Matavena, I have purchased the MCM and Vifa drivers but am considering a 15" for the bottom ina tapered baffle to fit it. Would the DAyton PA380 be a viable driver to mate with the top end? I know people swear by the Eminence Alpha 15 but the FR. and FS are lower on the Dayton, whats your opinion?
Just a question to those who may know the answer.I have been looking at possibly using this: http://www.parts-express.com/pe/showdetl.cfm?partnumber=310-308This would be keeping with the low cost solution, and may assist those looking for a way to power the low end. I do not have the stuff for the kit, but maybe someone could throw this in (only $27, keeping my fingers crossed) and test it out.I may be picking up this tiny amplifier soon, so I may be able to report on it.
Hey Squid,Can I ask how you plan to drive the PA380?
The same way as the original design, maybe just the next size up amp. Still mono forthe bass drivers (8 ohm drivers) Crossover just like the original design but making the bafflewider on the bottom to fit the 15". I love the design but wondering if it would be possible tomake a single baffle to be truely full range w/o the need for a sub?
Total Q is fairly low on the Dayton 15" Pro Sound, which is why I asked. I believe it will be a better sounding driver than an Alpha, but you should consider a separate sub amp with built-in boost, around 6dB in the 30-40Hz range. The driver's lower Fs will probably not benefit you as much, but if you can compensate for the low Qts electronically, you should be fine.
Are you suggesting something different than the Yung amp? I thought just more watts withsame boost/features to power the bigger driver
Matevana,I just wanted to make sure that the Dayton 15 had the right parameters for OBEverything else will follow your design, I will let you know how things progress.
I'm really stoked to hear about your design. Please consider doing a build thread so we can follow. You will be the 5th person that I am aware of to build some form of the Hestia. I have to say that they have all been extremely pleased, especially considering the cost.I actually got together with sjhomey (he is also doing a build) and swapped drivers, I had an extra pr.of tweeters and he had an extra pr. of the MCM mids so it worked out great and will do a thread whenI get started building. Thanks for a great design
I actually got together with sjhomey (he is also doing a build) and swapped drivers, I had an extra pr.of tweeters and he had an extra pr. of the MCM mids so it worked out great and will do a thread whenI get started building. Thanks for a great design
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