Sealed Audiopulse Axis 15 build thread - AVS Forum
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Old 02-04-2009, 02:14 AM - Thread Starter
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I'd like to start this thread by thanking all of the regulars who post here in th e DIY forum. I've lurked for a while and learned loads of great information form you guys.

My build was completed about two months ago.

Goals:
1) relatively compact footprint
2) Better output and quality than my Titanic 15 inch sub and SVS PB12 plus/2
3) No LLT/EBS due to the combined HT/living room setup I currently have

I decided to go sealed, mostly because of my desire for a small footprint. I decided to use an ep2500 to power my sub. Then the debate was which driver to buy. I debated on the LMS, Maelstrom, or acoupower. Then one day PartsExpress had the 15inch Axis woofers on sale for 350/ea. I did a quick model in Win ISD, and decided that I'd go with this woofer.




Oh, yeah- forgot to mention this. I built 4!

Pics to follow

todd
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Old 02-04-2009, 04:05 AM - Thread Starter
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Pics!

they've arrived!



Woofer P0rn:



The Axis / TC3000 looks more robust than my Titanic (now in semi-retirement)



As mentioned, there are 4 involved:





Power!

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Old 02-04-2009, 09:07 AM
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Quote:
Originally Posted by toddbagwell View Post

Oh, yeah- forgot to mention this. I built 4!

I remember you from that PE DotD thread.

YID DIY
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Old 02-04-2009, 09:10 AM
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Get some pics posted!

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Old 02-04-2009, 09:56 AM
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Looking forward to what you come up with! No LT, oops! LLT. OK, but what about LT? Maybe you wont need it?

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Old 02-04-2009, 01:49 PM - Thread Starter
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Originally Posted by steve nn View Post

Looking forward to what you come up with! No LT, oops! LLT. OK, but what about LT? Maybe you wont need it?

so far, no. I've got a BFD, and essentially added a few PEQ bands to stay flat to 15-16 /Hz. Call it a poor man's Bassis.

todd

now back to adding pics...
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Old 02-04-2009, 01:58 PM
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I picked up a pair of the AP Axis 12's when they were on sale and they are nice little drivers.

I also have a pair of TC-3k's 15" which are the Axis equivalent and love those as well.

Your gonna have fun

"Half the world is looking for Jesus, and the other half is looking for more bass..."
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Old 02-04-2009, 02:03 PM - Thread Starter
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MDF + my poor little Subaru:



After modelling in win ISD, I decided to go small and sealed. Boxes are 1.5 inch MDF 18 inches on all sides with an extra 3/4 inch panel on the front to flush mount the drivers.

Don't have too many pics of actual box assembly. they were hurridly done in my borther-in-laws not really heated wood shop / old barn in early December. They are glued and screwed. I decided not to do any internal bracing due to small, double layer walls, and my desire not to spend five days cutting circles to do a magnet brace style of mid box bracing. window bracing would have to had been behind the driver. In my design, the back of thedriver was ~6 inches from the back of the box, and I didn't feel it would add much to the design. Feel free to comment if you need to.



Holes were cut with a router buddy base plate attachment.

Again, thanks to NeoDan for the pillow idea for internal stuffing. (yes I removed the plastic on the pillows before final assembly.

Boxes are primed:



Black is a great color:



Home made Speakon terminals for amp side, bananas for the sub:



Assembly pics:





http://lh3.ggpht.com/_3G76xZFoIrc/ST...0/DSC_1138.JPG

thanks for looking

todd
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Old 02-04-2009, 02:13 PM - Thread Starter
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Finished Setup:
right



Left:



My humble system:



No REW just yet, as I didn't have a laptop for the longest time. With a Rat Shack Meter, I'm flat to 15 hz in my room with a BFD and some aggressive filters(+5 to+10db) below 30 hz, but hey- that's why I modeled in WinISD. With 2000 watts- the drivers just neared 30mm excursion (IIRC- i spent six months trialing different drivers and boxes prior to the woofers going on sale and becoming my final choice).
So is it an LT? No, not strictly speaking.
It is small and sealed which meets my design goals. It is reasonably flat in room with BFD tuning (+/-) 3-4 db from 100 hz to 15Hz.

the total system sounds phenomenal!!!!!

I feel that I've gotten a great deal, and that to get much better performance (think Quad LMS or theEar's setup - I'd have to spend SIGNIFICANTLY more money. My original benchmark was the JL F113- If i could get similar performance for less than a total of 12,000 (4 JLs) I'd be happy.

Simply stated, I am happy. The bass is great, low, loud, controlled and in reference to another thread here, with the right amount of volume, I do get a kick you in the chest feeling!

Total outlay including some tool purchases and some unnecessary bits and pieces here and there was around 3.5K. Not cheap, but it was never designed to be a budget setup.

Thanks for reading,
todd
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Old 02-04-2009, 02:33 PM
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those are cool subs.

theres something wrong with the way you take pictures though. they're too dark.

seriously.

somewhere between a tripod, manual exposure setting and photoshop you should be able to do it ( next time ) ...
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Old 02-04-2009, 02:47 PM
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Very nice set-up.

Since you are using the EP2500's maybe try using the lowpass filter to cut 2 of the subs off at 30 or 50 hz and see what that does for the midbass. I don't know if that will be better but the one thing that lacks with the Axis/TC-3k is the midbass so it should be worth a try.

As far as your JL Fathom comparison I had a Fathom F113 when I built my TC-3K 15". The JL was the most accurate and articulate sub I have ever owned but it did not have the SPL or anger of the TC-3K which is a great sub.

"Half the world is looking for Jesus, and the other half is looking for more bass..."
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Old 02-04-2009, 03:46 PM
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looks great, and I'm sure it sounds even better. $3.5k is probabaly cheap compared to the sound you are getting.

I'm suprised the pictures dont fall off the tv stand with those four monsters playing.
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Old 02-04-2009, 04:19 PM
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I have a TC 3k 15" sub and it's a great sub, it hits hard/low and it is also accurate with little distortion. As mentioned before, its weakness is the mid-bass (from about 60hz-100hz). Comparing it to the F113, I think the TC sub is better (more spl) from 50hz and below, above 50hz or so, I think the F113 takes over. With four of those subs, the bass has to be awesome (not a humble system for sure).
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Old 02-04-2009, 04:48 PM
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Old 02-04-2009, 05:10 PM
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I can imagine how visceral that is, especially when cranking music with lots of 30 hz info. Awesome!

"You take the blue pill - the story ends, you wake up in your bed and believe whatever you want to believe. You take the red pill - you stay in Wonderland and I show you how deep the rabbit-hole goes."
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Old 02-04-2009, 05:35 PM
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Those look really nice. I'd imagine it's going to be hard turning them up too much without shaking those pictures off the wall!

Just curious, what do you have under your mains? Concrete covered with fabric? If so, was it a noticable improvement?
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Old 02-04-2009, 06:19 PM
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Since everyone wants to compare with the Fathom F113, I just saw this post on the Klipsch forum.

Measured response 1/8th space outdoors, comparison between RT-12D, F113 and the DD-15.

http://forums.klipsch.com/forums/sto...l%20fathom.pdf

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Old 02-04-2009, 06:30 PM
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RT-12 does not look so bad does it

Take that limiter servo thing off the DD18 and it will wreak those two subs.

too bad...


edit: btw, very nice job Todd, glad you like it! Looks like a killer system

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Old 02-04-2009, 06:34 PM
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I have heard the RT-12, and it does good, as does the Palladium sub. I have not heard a JL, so I can't speculate on how it performs. Kyle, that was the DD-15, not the DD-18.

"You take the blue pill - the story ends, you wake up in your bed and believe whatever you want to believe. You take the red pill - you stay in Wonderland and I show you how deep the rabbit-hole goes."
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Old 02-04-2009, 06:36 PM
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Four sealed 15's with four mono amps.....Ahhhhh warms my heart.You can build a BASSIS kit for 285.00 I'm sure it sounds killer either way.

Have you played U571 yet. That damn opening is my fav.

Kg
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Old 02-04-2009, 07:01 PM
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Quote:
Originally Posted by michael hurd View Post

I have heard the RT-12, and it does good, as does the Palladium sub. I have not heard a JL, so I can't speculate on how it performs. Kyle, that was the DD-15, not the DD-18.

oh!

ya, the DD's are suppressed by the electronics. I know they have more headroom if they let thier BL run a little looser.

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Old 02-04-2009, 10:00 PM - Thread Starter
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Beautiful.....

Thanks. They sound great. This was my first woodworking project, so the finish isn't up to professional standards, but with the lights down a little, you can't see anything really noticeable.

todd
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Old 02-04-2009, 10:03 PM - Thread Starter
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Quote:
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I can imagine how visceral that is, especially when cranking music with lots of 30 hz info. Awesome!

I am a fan of techno/electronica/trance

they do a more than adequate job

todd
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Old 02-04-2009, 10:12 PM - Thread Starter
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Quote:
Originally Posted by Erich H View Post

Those look really nice. I'd imagine it's going to be hard turning them up too much without shaking those pictures off the wall!

Just curious, what do you have under your mains? Concrete covered with fabric? If so, was it a noticable improvement?


Yup, good eye. They are essentially concrete pavers with a "tailored" sheet from target to increase the WAF.

I'd seen some measurements on the Infinity Beta 50s from ultimateAVmag.com, where their High Frequency response was smoother at about 15 degrees below the tweeter axis. It was a cheap tweek from Home depot.

After doing some rudimentary measurements, I found out that I had a nasty 2-4k bump in my room's response. I knock this down with a filter in iTunes digital EQ with great success.

to answer your question, It probably made a slight improvement (response and mechanical decoupling) but with the tight quarters in my setup and my laziness, I haven't tried to do any A/B testing.

todd
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Old 02-04-2009, 10:14 PM - Thread Starter
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Quote:
Originally Posted by KyleLee View Post

RT-12 does not look so bad does it

Take that limiter servo thing off the DD18 and it will wreak those two subs.

too bad...


edit: btw, very nice job Todd, glad you like it! Looks like a killer system


Thanks, not long after I ordered my drivers, you posted a photo from the TC assembly line, and I wondered if my boys might be in the lineup!

todd
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Old 02-05-2009, 04:19 AM
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Quote:
Originally Posted by KyleLee View Post

oh!

ya, the DD's are suppressed by the electronics. I know they have more headroom if they let thier BL run a little looser.

its called good engineering Kyle

also know as "better safe than sorry"



Quote:
Originally Posted by toddbagwell View Post

I am a fan of techno/electronica/trance

here is some trance i enjoy on my LMS:

Talpa - My Kingdom:

http://www.box.net/shared/static/czlzi35mn0.mp3
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Old 02-05-2009, 04:41 AM
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only thing missing in this room is a pair of LS-9's

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Old 02-05-2009, 06:19 AM
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Nice build!

I can understand why you would be happy.

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Old 02-05-2009, 06:45 AM - Thread Starter
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only thing missing in this room is a pair of LS-9's

I know, right?

i must admit I was a little freaked out about your spy skills until I checked the TCA forum to see you also have a pair on order. What's your av123 handle?

todd
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Old 02-05-2009, 12:06 PM
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WHAT $350 each ! I missed the sale...NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO

Damn these one day sales. I would have purchased four at this incredible price. The TC-3000 is one hell of a driver.

Congratulations on the purchase,these model and perform well in very small sealed boxes.

NOOOOOOOOOOOOOOOOOOOOOO...I missed the sale.

Ask yourself mortal , do you have as much displacement as me ? The answer is no unless you have a Windmere fan sub.
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