Next project . . .

[Pete Schumacher ®]

Well, I'm getting my wrist operated on (FINALLY) to relieve the terrible tendonitis I've had for almost two years in my left thumb. I was going to get the operation in April until the heart attack occurred. Blood thinner therapy prevented any surgery, but the last checkup relieved me of that stuff. 6 weeks of recovery and I'll be able to handle power tools and large cabinets once again!!!

So, I've been aching to build another large system, along the lines of my Stentorian . . . , a three-way with down-firing 12" sub and MTM using Peerless CSX woofers and Dynaudio D21/2 tweeter. I sold these to my little brother a while back. I heard them at his house a couple weeks ago and realized I'd forgotten what dynamic, clear, and chest poundingly capable speakers they are. I need to do it again . . .

So, I'm thinking a 4-way, passive system, using all Reference series components. Sealed Box RSS390HF, 30Hz F3, for in-room bass to 20Hz or lower, depending on room gain. Crossed at 200Hz to RS180-4, Crossed at 800Hz to RS52, crossed at 2500Hz to RS28, all quasi-second order (Deulund). Cabinets wouldn't be too huge. I'm thinking of breaking it up into two sections for ease of movement, the three way sitting on the bass bin. Almost Paul K's Centilana with RS28 instead of XT19, sitting on the RSS390HF.

The weakest link, to me, is the performance of the RSS390HF above 100Hz. Any thoughts? I could try for a lower XO point, but the passive components become quite large.

[philiparcario]

Pete use the rss390hf-4 as platforms . use the reckhorn b-1 or f-1 to cross between the sub and the midranges cross at 80hz.

http://www.creativesound.ca/details.php?model=B-1


http://www.creativesound.ca/details.php?model=F-1

http://www.reckhorn.com/index.php?ln=en&prod=b1

http://www.reckhorn.com/index.php?ln=en&prod=f1

[Pete Schumacher ®]

Pete use the rss390hf-4 as platforms . use the reckhorn b-1 or f-1 to cross between the sub and the midranges cross at 80hz.

http://www.creativesound.ca/details.php?model=B-1


http://www.creativesound.ca/details.php?model=F-1

http://www.reckhorn.com/index.php?ln=en&prod=b1

http://www.reckhorn.com/index.php?ln=en&prod=f1

Thanks Phillip.

But I really want this to be a passive system. A true 4-way to be driven by a single amp channel. I know I can add a good sub amp to fill in the low end, but that's not the idea here.

If I were to do that, I'd likely go all active and forgo the passive XOs altogether. Maybe I'll rig up the wiring to allow the XO to be bypassed for future mods to an all active system.

[philiparcario]

I have a lot of luck with the reckhorn and i push it. I have the 1 rss390hf-4 in the IB it runs from 18hz to 50hz then the nht1259's act as stands for the focal mtm's. The nht1259's run from 50 hz to 100 hz and the focal mtm's run from 100hz and up.
The rss390 sounds great up to 70-80 hz in the IB after that distortion shows up as a bit of muddy bass. If you are thinking of going active The mcm biplates are good . solen from canada has a new version of them with 3 different x over points

http://www.solen.ca/pub/cms_nf_catal...lvbj0yJmZ0PW5m




http://www.mcmelectronics.com/product/50-6277 this crosses around 2900hz

I think they all come from

http://www.yung.com.tw

http://www.yung.com.tw/pdf/ap016.pdf

[zach_t]

Put the sub in the bandpass enclosure and let the enclosure roll-off the upper-end. If you could find a sub and bandpass enclosure design with an upper F3 of 80-Hz, then a MTM with a F3 of 80-Hz (or lower) in a sealed enclosure, you will be good to go.

You may want to add a low-pass filter to the sub, but I think it can be higher in Freq., just to limit the higher freq. from reaching the sub.

[Pete Schumacher ®]

Put the sub in the bandpass enclosure and let the enclosure roll-off the upper-end. If you could find a sub and bandpass enclosure design with an upper F3 of 80-Hz, then a MTM with a F3 of 80-Hz (or lower) in a sealed enclosure, you will be good to go.

You may want to add a low-pass filter to the sub, but I think it can be higher in Freq., just to limit the higher freq. from reaching the sub.

That's a decent idea. I'll have to look at that one a lot more closely. A 2nd order filter would make that a 4th order acoustic to the midwoof.

I'll play around with some modeling on that one and see what happens. May just work out nicely. Couple that with the sealed box response of the RS180 and a second order HP and you've got another 4th order acoustic.

[gowa]

That CSS website has got to be the most awful one out there. They don't have many products so you would think they would put some effort into their site. I'm sure the cost would be small.

[zach_t]

HI Pete, glad you like it! I have been noodling a design with TB's 8x12 sub in the lower 1/2 of a tower and WMTMW in the upper 1/2. On paper, it is huge!

You may want to look at Dayton RSS210HF-4 8" Reference HF Subwoofer.

[rudyjakubin]

HI Pete, glad you like it! I have been noodling a design with TB's 8x12 sub in the lower 1/2 of a tower and WMTMW in the upper 1/2. On paper, it is huge!

You may want to look at Dayton RSS210HF-4 8" Reference HF Subwoofer.

About what I got! I modeled the RS 10" HF about 2 months ago and I was going to use the 12" Dayton Waveguides for the flares.
I know - crazy idea, but it sure would have looked cool.
Now I'll have to try it with the Dayton 10" Waveguides.
IF, they're still available when I get the money for the drivers...

[thylantyr]

Health first.

screw speakers

A big vitamin regimen is in order

[dlneubec]

Hi Pete,

Have you considered something like two RSS265HF's in series. You could put them in a smaller box, say 80 liters, and tune them in the mid 20's for an F3 in the 27hz range. They might be easier to integrate into a cabinet design and I know they are good to at least 200hz and I'd bet 300, so there would be some crossover parts savings to offset the additional driver cost. They are on sale right now for $115.

[Pete Schumacher ®]

Hi Pete,

Have you considered something like two RSS265HF's in series. You could put them in a smaller box, say 80 liters, and tune them in the mid 20's for an F3 in the 27hz range. They might be easier to integrate into a cabinet design and I know they are good to at least 200hz and I'd bet 300, so there would be some crossover parts savings to offset the additional driver cost. They are on sale right now for $115.

You know, that's not a bad idea. I was kind of salivating to use a 15" woofer, but there's nothing slouchy about a pair of 10s either. The only issue is the lower sensitivity vs. the RSS390. I just wonder how much worse (if at all) the 15's distortion spectra is compared to the 10 up to 250Hz.

[the kid]

While reading the above posts I couldn't help but notice that Pete is pretty good lookin'.

[danklugherz]

While reading the above posts I couldn't help but notice that Pete is pretty good lookin'.

I agree Kid, he looks pretty good in that dress.

[Brian Steele]

How about an augmented passive-radiator system for the bass, using hand-built PRs? :-)

I'd really like to see someone attempt one of those. In fact, I'd like to do it myself one day (I have a few ideas on how to build the required PR pair using some surround replacement kits, some mounting board and some fiberglass), but time, time, ...