Pete Schumacher ®

Full range 4-way

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, 11-14-2008 at 02:18 PM (3878 Views)

Well, I've been contemplating my "ultimate" system, ultimate within a reasonable budget, that can handle a 250W amp without batting an eye, and cover the full spectrum of HT effects to the subtlest nuances of the finest musical recordings. I intend this to be 100% passive XO. After the successful implementation of the Centilana and the Duelund topology, it would seem the only thing missing would be to anchor that design with a very good bass driver.

This will definitely be an all PE design. I'm thinking Dayton dual RSS265HF or a single RSS315HF for the lowest octaves, to 200Hz. To handle the upper bass, lower mids, I'm having a hard time not looking at the Usher 7 or 8 inch woofers. Their performance over the decade from 100 to 1000 Hz is quite amazing. I'd like to transition the midwoof to a dome mid, either the TB 3" at 600Hz or the RS52, around 800Hz, and then hand off to the Dayton RS28 at around 2500Hz. All acoustic XO slopes will be quasi-2nd order to allow that Duelund approach to take place over the entire spectrum.

The issue is in the execution for sure. I guess I'd need to start from the "ground" up, getting the Sub and midwoof to play together seamlessly. With the 2nd order slopes, there will be a lot of overlap among drivers, sub to mid, midwoof to tweeter, each affecting the driver levels in their passband. With the Duelund, the woofer and tweeter are in-phase, each 12dB down at their XO point, smack dab in the middle of the midrange band. The mid then is adjusted to fill in the broad dip between woof and tweet, allowing the mid to run 6dB below reference, and in-phase with both the woofer and tweeter over the midrange band. The addition of another driver below the woofer will certainly affect how the drivers overlap and constructively build the total output spectrum.

I'm anxious to build again. It's been a while!!!

Now that my home remodeling is almost done, I guess I need to get out the measuring gear and get everything set up again.

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Comments

jcapodieci - 12-03-2008 05:28 PM
The crossover has three parts one of which is a small resistor to control the tweeter and you're done and it sounds so good.
Mark65 - 12-18-2008 04:07 PM
Pete, I for one can't wait to see how this turns out, your designs always intrigue me, with their "too much is never enough" sort of attitude. I'd love it if you'd keep me posted via PM, but if you don't feel that I'm worthy of that sort of insider info (me being a rather untalented, uneducated noob and all), at least keep posting and/or blogging, I'm VERY interested in this project.

Thanks,
Mark
Pete Schumacher ® - 01-03-2009 03:00 PM
Well, after talking with Mark K, I think I've decided that the RS180 will be doing mid-woof duties from 200Hz to 600Hz. It's performance in that region is truly up there with some of the best drivers out there, including the SEAS Excels.

So, do I use a pair of RSS265 or the RSS315? The look of a system with gradually diminishing size, bottom to top, has a lot going for it. I know the performance of the RSS265HF is quite good to 200Hz, per Dan Neubecker and the HOSS. The extra surface area of the pair of 10s over a single 12 is something that needs to be considered. Will they be more than a single RS180 can keep up with? Or does the single 12 have the right match for the RS180?

I'll have to draw up some illustrations and let the missus have a look.
AJ - 06-07-2009 11:47 AM
A friend of mine uses a pair of RSS 12"s ported with the Schumakubins (with the Seas TDFC). The lower sensitivity of the 12"s is made up for with a Behringer EP2500 for power, and he's using a Tapco J800 (RMX850 clone) for the mains. I don't remember where we ended up level wise, but it was about even.

I use a single RS180 (Modula MT) over stereo 10"s (Infinity KappaPerfect 10.1, similar to the RSS 10"). With 400W/ch on the subs and 150W/ch on the mains i have to up the level of the Modula's to keep up.

My point is, I think you'll be okay with one RS180 with the single RSS 12", but maybe not with two RSS 10"s... Depends on how much BSC will be on the RS180 versus the subs; but you already knew that
donc - 12-28-2009 12:14 AM
hello Pete,
this sounds like what i want to for my last build ! what about putting one of those ae 15's you had told me about in the bottom of the stack ? meyer sound has/had (?) a powered tower=15"sub-12"woofer-10"mid-horn tweeter,like you say ,looked impressive ,two cabs,full spectrum, spl-near ear bleeding i'm sure , sq ? if you don't mind me asking , where are you with this design ? donc
henrikhegh - 10-27-2010 08:28 AM
Hi,.

If you want Duelund target curves, you can calculate and download them here :

http://www.speakerbuilder.dk/index.a...getype=content

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Pete Schumacher ®

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