Paul N. O'Neal - Looky here. *PIC*

[rudyjakubin]

Just got these yesterday. They were double boxed and both boxes were foamed. The 15 inch 'Hammers'
<A HREF="http://www.partsexpress.com/pe/pshow...TOKEN=48950367">http://www.partsexpress.com/pe/pshow...TOKEN=48950367</A>
A great job by PE shipping...
They match pretty well against the Kappa 15;
<A HREF="http://www.partsexpress.com/pe/pshow...20&ctab=2#Tabs">http://www.partsexpress.com/pe/pshow...20&ctab=2#Tabs</A>

Even the ports;
<A HREF="http://img.photobucket.com/albums/v6...r-15-Ports.jpg">http://img.photobucket.com/albums/v6...r-15-Ports.jpg</A>

Project #6 is starting to shape up. Probably be a summer project.

[paul_n_oneal]

> Just got these yesterday. They were double
> boxed and both boxes were foamed. The 15
> inch 'Hammers'
>
> Project #6 is starting to shape up.
> Probably be a summer project.

Looking nice and those Hammers look like they will do the job quite nicely. I've just changed the port tuning on my facets to the picture and am listening right now. Haven't really heard much of a difference but sometimes it takes a lot of songs to hear it. The ports are now dual 5.5" instead of dual 15". Here are the predicted box responses for this tuning:
F3=43
F6=38
F10=34

30hz Low Cut on Amp

[rudyjakubin]

Thanks Paul!

Greatly appreciated and thanks for pioneering a High Efficiency - High Fidelity speaker design.
Them 15" Hammers are built like Mack Trucks and just as heavy... well kinda...

> Looking nice and those Hammers look like
> they will do the job quite nicely. I've just
> changed the port tuning on my facets to the
> picture and am listening right now. Haven't
> really heard much of a difference but
> sometimes it takes a lot of songs to hear
> it. The ports are now dual 5.5" instead
> of dual 15". Here are the predicted box
> responses for this tuning:
> F3=43
> F6=38
> F10=34

> 30hz Low Cut on Amp

[rudyjakubin]

> Looking nice and those Hammers look like
> they will do the job quite nicely. I've just
> changed the port tuning on my facets to the
> picture and am listening right now. Haven't
> really heard much of a difference but
> sometimes it takes a lot of songs to hear
> it. The ports are now dual 5.5" instead
> of dual 15". Here are the predicted box
> responses for this tuning:
> F3=43
> F6=38
> F10=34

> 30hz Low Cut on Amp

Of course you'll let us know if it's boomy.
Pic below is with 2 - 4" x 5.5 inch tubes...

[paul_n_oneal]

> Of course you'll let us know if it's boomy.
> Pic below is with 2 - 4" x 5.5 inch
> tubes...

I listened to the entire CD Pete gave me and it was good to go. Gonna listen to some DVDs tonight. Not boomy at all. These woofers, including the Hammer since they are made by Eminence, have a small x-max but very tight clean sound. THe kind I love. Make sure you have a low-cut rumble filter in place just so it doesn't unload and possible damage something. They're to expensive for that

[rudyjakubin]

I can see why I'll need that filter!

[rudyjakubin]

I may go DCR since it's two ports - that should help some...

[Wolf]

> I can see why I'll need that filter!

Dude- try modelling it at about 25W, that is more accurate of where you'll drive them. I RARELY push my 95dB speaks with more than a couple of watts. Xmax isn't really an issue in the home environment. According to the Bob Cordell amp tests, a 95dB speaker will only require 17W to not clip at a moderate listening level. You have to consider that 4-5W is all you'll need to breach 100dB, and that is VERY loud.
Later,
Wolf

[paul_n_oneal]

Wolf, I'm going to have to slightly disagree with you on that. Peaks of 100watts is not all that difficult to obtain in the home environment. IMHO, any pro woofer should have a subsonic filter either on the amp (where mine is) or build one into the crossover. You do not want that bad boy unloading and possibly causing damage. People also like to show off like me. When Andrew was over we cranked it up to where we could barely hear each other talking from a few feet away. Don't forget that the SPL is an exponential function. The more sound at higher levels require much more power. Be safe and use subsonic filter. These are not subwoofers but music woofers.

[paul_n_oneal]

> Of course you'll let us know if it's boomy.
> Pic below is with 2 - 4" x 5.5 inch
> tubes...

OK, I've listened to about 6 diffenent CDs and DVDs and all is good to go. Definitely not boomy but the lower bass is a bit more defined. I like my bass and I think most of us do. Try this alignment, I like it better than the slow rolloff. More kick on the bottom end and not the HT boomy stuff. I was afraid it would be too much bass but it's not to me. My final step is to get these beasts outside and actually measure the final response on and off axis. Being 120lbs and many other things to do on the todo list may make that in the future some time. BTW, play it safe and use your subsonic filter on them. Most amps have one.

[Wolf]

> Wolf, I'm going to have to slightly disagree
> with you on that. Peaks of 100watts is not
> all that difficult to obtain in the home
> environment.

Yes, but not with that SPL capability. I'll almost bet you were only running about 25W. The 90dB speaker would hit the 100W points during transients, yes. However, you have about 5-6 more dB output here, so you don't require as much power. This isn't an opinion, but a proven fact through Bob's tests. You'll only require about 17W of clean RMS power to avoid clipping at the moderate level they used. I can't recall the level. However, if you exceed this, it still won't be 100W before you can't tolerate it.

IMHO, any pro woofer should
> have a subsonic filter either on the amp
> (where mine is) or build one into the
> crossover. You do not want that bad boy
> unloading and possibly causing damage.

I used an Eminence 12" in my MTMW's, so I do have a clue. At the wattage normally used here at home, I won't exceed xmax at all.

> People also like to show off like me. When
> Andrew was over we cranked it up to where we
> could barely hear each other talking from a
> few feet away. Don't forget that the SPL is
> an exponential function. The more sound at
> higher levels require much more power. Be
> safe and use subsonic filter. These are not
> subwoofers but music woofers.

Who says I don't like to show off? Shawn came up and hooked up his Crown 402 once, and we hit 100dB, with the knobs just ONE click above 9:00. I couldn't take anymore, and it was briefly. There were no problems whatsoever. I realize that doubling the power input gives you approximately 3dB more output every time it doubles. They are 95dB speakers, and only require about 4W to reach 100dB. That isn't a false statement. I've never used a subsonic on mine, and it's a 12". You can disagree with me, but the power experiment did prove what I'm saying.
Here's Bob's website:
<A HREF="http://www.cordellaudio.com/">http://www.cordellaudio.com/</A>
Later,
Wolf

[Pete Schumacher ®]

> OK, I've listened to about 6 diffenent CDs
> and DVDs and all is good to go. Definitely
> not boomy but the lower bass is a bit more
> defined. I like my bass and I think most of
> us do. Try this alignment, I like it better
> than the slow rolloff. More kick on the
> bottom end and not the HT boomy stuff. I was
> afraid it would be too much bass but it's
> not to me. My final step is to get these
> beasts outside and actually measure the
> final response on and off axis. Being 120lbs
> and many other things to do on the todo list
> may make that in the future some time. BTW,
> play it safe and use your subsonic filter on
> them. Most amps have one.

But you've added a highpass filter too. How does the whole transfer function look with the higher tuning and the filter together?

[Pete Schumacher ®]

> But you've added a highpass filter too. How
> does the whole transfer function look with
> the higher tuning and the filter together?

I saw it up on the post above that sucked up all the bandwidth.

You definitely will notice more bass in the 40Hz region, and less below that.

[kenmcculloch]

>Paul, the Hammer's need a bigger box than your cabinet don't they?

[rudyjakubin]

Hi Wolf...

I only used 100 watts for modeling to check on the port velocity.

Since I decided to go with a dual-chambered reflex cabinet I was wondering if you came across this benefit the box is supposed to have and that is negate cone unloading??
I've tested my Dual Dayton 8 inch Classics in a DCR box and have repeatedly run test tones down to 1 hz at really high power levels and not experience cone unloading. Xlim yes and with cone slapping but not unloading as my ported boxes exhibited with the same woofers.

Just curious since you have built DCR boxes...
Thanks, Rudy...

[Wolf]

> Hi Wolf...

> I only used 100 watts for modeling to check
> on the port velocity.

> Since I decided to go with a dual-chambered
> reflex cabinet I was wondering if you came
> across this benefit the box is supposed to
> have and that is negate cone unloading??
> I've tested my Dual Dayton 8 inch Classics
> in a DCR box and have repeatedly run test
> tones down to 1 hz at really high power
> levels and not experience cone unloading.
> Xlim yes and with cone slapping but not
> unloading as my ported boxes exhibited with
> the same woofers.

> Just curious since you have built DCR
> boxes...
> Thanks, Rudy...

The 3" DCR I made definitely is a good complement, but you can unload a 3" or 4" driver with enough power. Even the FR125S unloaded, but not as bad when I plugged the first port in the 3CR. It's give or take, as I haven't made one with a larger driver.
Later,
Wolf