The RS Subs Are Finally Here!!!!!

[cjd]

Two of the TC 15's would be better... :B

C

[Stevepaul]

In my 16'x12'x9' room, I have a feeling that one TC2+ 15" is going to do just fine. Two might be a bit of over-kill......not that that is a bad thing!!

lol
Steve

[cjd]

What?!

I have two 15's in my 9x13x7.5H room. Granted, it's an IB. . . but I am thinking of trying out a pair of long excursion 18's one of these days. . .

C

[Stevepaul]

Funny, the older I get (42 and counting) the less I turn it up to decibal levels that require that much oooomph. A nice, low distortion, smooth sounding 15" sub cruising in the low 90's decibal range for an hour or two of listening is more my style these days.

Regarding loud music, my 13 year old daughter seems to have fallen in love with my 17 year old Klipsch Chorus II's...at least the db levels that they can reach. 101db sensitivity horn speakers hooked up to a 5 year old Sony A/V receiver and a 15 year old CD carousel.....'Green Day' never sounded so good to her! The old Klipschs' are now her 'reference' speakers! Every time I build a new set of speakers, she asks me how loud they play...not how good they sound... :roll:

Steve

[Jack Gilvey]

Darren from PE posted this article using the 12" HO version:

http://www.parts-express.com/projectshowcase/drake/index.html

[ThomasW]

Darren from PE posted this article using the 12" HO version:

"The Drake"?

Marketing doesn't appear to be one of Darren's strengths. Where does he come up with these names? .... :wink:

[Brian Bunge]

Thomas,

What? You don't like "Dr. K's" for a nice speaker name?

[Jack Gilvey]

I'm not quite sure what he's referring to with that name...

[Smilie]

Must be that he thinks this design is "just Ducky".

[JonMarsh]

Well, the HO is a 'ho, unless you like that precipitous fall off in the bottom end. It's a nice small looking box, but in room it will be heavy in the 30-55 Hz area, and drops quickly below that. Sometimes I don't under stand Dr. K.



And naming the MTM's after himself makes them sound a little like a foot preperation. Fortunately, he's much better working with driver vendors than at marketing. I prefer that to the reverse possibility.

[Jack Gilvey]

Given the very low Le and assumed low distortion, might not an array of the HF drivers be nice in an IB, even though they lose out in the Vd/$ sweepstakes?

[ThomasW]

It's difficult to say how audible distortion is at low frequencies. Earl Geddes had an interesting 'test' on his website. He's since taken it down, but it can still be accessed via this link

http://web.archive.org/web/20040213161124/http://www.gedlee.com/distortion_perception.htm

[Lex]

Well, at least we know you can get to and from work in a hurry Jon. (Think NSX)

[cjd]

Well, at least we know you can get to and from work in a hurry Jon. (Think NSX)

Like it doesn't slow you down when you see the blinking lights. . .

[JonMarsh]

Like it doesn't slow you down when you see the blinking lights. . .

Blinking lights? Were there blinking lights coming back from the airport last night? (other than a coupld of traffic lights on the fritz) Oh, well, maybe that would explaine the helicopter... good thing Darth Acura is black.

~Jon

[JonMarsh]

Given the very low Le and assumed low distortion, might not an array of the HF drivers be nice in an IB, even though they lose out in the Vd/$ sweepstakes?

I think they're be very nice, and I've been just pleased as punch that Darren was willing to produce both version, which really are oriented to different system design philosophies and applications.

Once in a while, we DO get lucky.

Got notification on Wednesday that my Praxis system shipped! Wooooo Hoooo!

The Aco Pacific PS9200KIT 1/2 inch Type 1 measurement microphone system was out of stock, but they'r having it drop shipped from Aco, so that should be in sometime next week, too.

PS9200 Kit






As old as my B&K and HP preamp are (from mid 70s, and I got it used), I figured maybe I've got my money's worth and don't want to repair the preamp the next time it goes on the fritz, so this looks like a good upgrade.

~Jon

[Jack Gilvey]

I think they're be very nice, and I've been just pleased as punch that Darren was willing to produce both version, which really are oriented to different system design philosophies and applications.

I agree it's a great approach to driver design/marketing.

Regarding inductance, is low Le a worthwhile goal even if a sub is used just for infrasonics? That is, does a high Le have effects aside from causing rolloff or distortion in the upper bass?
If that's the case, multiples of a low-Xmax/Le driver like the HF might make sense rather than fewer high-Xmax/Pe drivers (which always seem to have high Le). Maybe?

Trying to wrap my head around Le...

[JonMarsh]

It all depends, Jack. The higher inductance increases the inductance modulation which increases the higher harmonics in the output- BUT, the HO still has rather low inductance, compared to most. Where you run into problems is your more typical driveres with 3-8 mH, and they actually have their frequency response rolling off above 70 Hz. (Big Blueprints, TC-Sounds come to mind- for example, the HE-15). If you only used one of those drivers below 40 or 50 Hz, maybe no problem. Say, as a monopole sub for a dipole setup, just re-inforcing the very low bass.

Besides, with all that inductance, it won't be as "fast" a bass, right?

In case anyone doesn't realize, that was a trollish statement... but I do like to EQ the HE15 flat to 125 or 150 Hz, THEN implement the crossover. But that's compensating electrically externally. Might be better just to have a better driver. Me thinks multiple RS315HF for deeper bass are nice, and for dipole response to a few hundred Hz, the RS265HF. Yum, Yum.

~Jon

[Jack Gilvey]

Yep...that does sound good! I keep coming back to dipole down to 40Hz or so to calm the room and monopole/IB below. I'd imagine Le is truly irrelevant down that low...

[TacoD]

I think they're be very nice, and I've been just pleased as punch that Darren was willing to produce both version, which really are oriented to different system design philosophies and applications.

Once in a while, we DO get lucky.

Got notification on Wednesday that my Praxis system shipped! Wooooo Hoooo!

The Aco Pacific PS9200KIT 1/2 inch Type 1 measurement microphone system was out of stock, but they'r having it drop shipped from Aco, so that should be in sometime next week, too.

PS9200 Kit






As old as my B&K and HP preamp are (from mid 70s, and I got it used), I figured maybe I've got my money's worth and don't want to repair the preamp the next time it goes on the fritz, so this looks like a good upgrade.

~Jon

My brother (partner in crime) also got his Praxis setup last week.

[Jack Gilvey]

Anyone play with these yet?

[ThomasW]

I think Jon's fondled one of his drivers, but that's about the extent of it... :B

[Jack Gilvey]

Well, that's a start. No sense rushing to mount it.

[JonMarsh]

Yeah, as one of my departed (unfortunately) colleagues in Munich used to say, "Slow work takes time."

But boy, have I fondled it...

It's a wonder they haven't gotten the local police on me, except I've been traveling so much on business they never know when to catch me at home!

[elfranche]

Dayton HiFi

Here is my recent DIY design using the Dayton Hi-Fi subs:

http://www.stormpages.com/elfranche/index.html

[James W. Johnson]

Very nice. ^^^

I am going to try one of these drivers out myself.

[JonMarsh]

I think Jon's fondled one of his drivers, but that's about the extent of it... :B

Well, now I've even created a 3D CAD drawing of it in my new software (TurboCAD 3D for Mac, aka CSI Concepts 3D).

To test, perchance to dream...


PE's out of stock at the moment, but hopefully will be back in stock soon. Only need one to test, but more to build anything.

~Jon