Another LTD02 Designed Sub Build - Page 4 - AVS Forum
Forum Jump: 
 2Likes
Reply
 
Thread Tools
post #91 of 240 Old 11-15-2013, 02:49 AM - Thread Starter
Advanced Member
 
atabea's Avatar
 
Join Date: Aug 2008
Posts: 669
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Liked: 54
Quote:
Originally Posted by mhutchins View Post

Hey Rick (@atabea),

I just noticed that the NL4MP-ST chassis connectors are not air tight, I don't know how big an issue that is with this huge sub, especially since it is a ported design, but....

I bought these sealing gasket just to ensure an air tight fit. https://www.parts-express.com/neutrik-scdp-0-sealing-gasket-for-d-size-connectors-black--092-094
And I also got the NL4MP-UC which is supposed to be air tight. https://www.parts-express.com/neutrik-nl4mp-uc-speakon-connector-4-pole-panel-mount--092-067

And you are right, those bracing is the most time consuming and least fun part of the build. Otherwise it was a very straight forward process--thanks to your very detailed build sequence.

thanks

Rick
MemX likes this.
atabea is online now  
Sponsored Links
Advertisement
 
post #92 of 240 Old 11-15-2013, 07:28 AM
AVS Special Member
 
steve nn's Avatar
 
Join Date: Aug 2003
Posts: 6,207
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 425
Quote:
And you are right, those bracing is the most time consuming and least fun part of the build. Otherwise it was a very straight forward process--thanks to your very detailed build sequence.


Yes that looks real nice, a box load! nice job man. It’s coming together very nicely.

Klipsch RB-75
Klipsch C-7
Klipsch RB-35
On-going SW management class
Denon
PS3
steve nn is offline  
post #93 of 240 Old 11-15-2013, 09:39 PM - Thread Starter
Advanced Member
 
atabea's Avatar
 
Join Date: Aug 2008
Posts: 669
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Liked: 54
^^^^^^^^ Thanks steve nn, I should have the box completed this weekend, after which I will start sanding, priming and painting (duratex).

I still need to figure out how to wire the driver/amp/speakon connectors for best performance and also to be able to accommodate a second unit without having to remove the driver of the first unit. I am also going with pillows for stuffing but I just can't grasp the concept of how many pillows I need and exactly where they should be placed. I have searched for pictures but all I can find are other type of stuffing such as foam and loose poly fill---never any "whole" pillows. Perhaps the usual suspects (experts) can chime in on this.

Thanks,

Rick
atabea is online now  
post #94 of 240 Old 11-15-2013, 10:17 PM
AVS Special Member
 
steve nn's Avatar
 
Join Date: Aug 2003
Posts: 6,207
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 425
I know, the whole pillow thing is fairly new to me too, but I understand the concept. I would place one on the back of your sub and one one the bottom and call it good! I might even elect to just do the back and try it out. The speakon issue I have no experience with, so sorry I can’t even suggest regarding.

Klipsch RB-75
Klipsch C-7
Klipsch RB-35
On-going SW management class
Denon
PS3
steve nn is offline  
post #95 of 240 Old 11-15-2013, 10:21 PM
AVS Addicted Member
 
LTD02's Avatar
 
Join Date: Oct 2003
Posts: 15,967
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 133 Post(s)
Liked: 852
http://www.data-bass.com/data?page=content&id=79

and

http://www.avsforum.com/t/1153089/700-playhouse-sub-ported-fi-q18/60#post_16709957

3 pillows would be a good start.

just plop them in there toward the middle of the cab.

Listen. It's All Good.
LTD02 is online now  
post #96 of 240 Old 11-15-2013, 10:47 PM
AVS Special Member
 
steve nn's Avatar
 
Join Date: Aug 2003
Posts: 6,207
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 425
Quote:
Originally Posted by LTD02 View Post

http://www.data-bass.com/data?page=content&id=79

and

http://www.avsforum.com/t/1153089/700-playhouse-sub-ported-fi-q18/60#post_16709957

3 pillows would be a good start.

just plop them in there toward the middle of the cab.


I see, you’re talking about changing the freq response in vented with sealed example. mmm, I have seen a few guys do this with vented though. wink.gif

Klipsch RB-75
Klipsch C-7
Klipsch RB-35
On-going SW management class
Denon
PS3
steve nn is offline  
post #97 of 240 Old 11-16-2013, 05:01 AM
AVS Addicted Member
 
LTD02's Avatar
 
Join Date: Oct 2003
Posts: 15,967
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 133 Post(s)
Liked: 852
?

if by that you mean to eliminate the resonance in the frequency response, that's right.

Listen. It's All Good.
LTD02 is online now  
post #98 of 240 Old 11-16-2013, 06:35 AM - Thread Starter
Advanced Member
 
atabea's Avatar
 
Join Date: Aug 2008
Posts: 669
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Liked: 54
Quote:
Originally Posted by LTD02 View Post

http://www.data-bass.com/data?page=content&id=79

and

http://www.avsforum.com/t/1153089/700-playhouse-sub-ported-fi-q18/60#post_16709957

3 pillows would be a good start.

just plop them in there toward the middle of the cab.

Great! thanks LTD. I will pick up the pillows today. From what I have read, it would be best if I wire the voice coils in series for 8 ohms and use the 3000 DSP in bridged mode like this:

http://www.avsforum.com/t/1489541/large-ported-dayton-ho18s/480#post_23840909

As for the Amp, I would have to take the black wire connected to 1- on the Speakon connector and and transfer it to the hole labeled 2+. Should this process also be done on the other end of the cable where it connects to the sub?

Since I plan on adding a second sub to this amp, are there any other steps I should take while I still have the box open?

Thanks

Rick
atabea is online now  
post #99 of 240 Old 11-16-2013, 07:03 AM
AVS Special Member
 
steve nn's Avatar
 
Join Date: Aug 2003
Posts: 6,207
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 425
Quote:
Originally Posted by LTD02 View Post

?

if by that you mean to eliminate the resonance in the frequency response, that's right.

I was just talking dampening sound reflections/internal resonances, not enouph to change the freq response. I think we're on the same page.

Klipsch RB-75
Klipsch C-7
Klipsch RB-35
On-going SW management class
Denon
PS3
steve nn is offline  
post #100 of 240 Old 11-16-2013, 08:09 AM
AVS Addicted Member
 
LTD02's Avatar
 
Join Date: Oct 2003
Posts: 15,967
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 133 Post(s)
Liked: 852
"From what I have read, it would be best if I wire the voice coils in series for 8 ohms and use the 3000 DSP in bridged mode like this"

there are two ways to wire it and they produce the same result.

1. wire coils in series for 8 ohms per driver. wire drivers in parallel for 4 ohms net. connect to amp and run amp in bridged mode.

2. wire coils in parallel for 2 ohms per driver. wire one driver onto each channel. connect to amp and run amp in stereo mode.

method 2 presents the least confusion with connecting the speakons, I think.

either way, same result.

"are there any other steps I should take while I still have the box open?"

be sure to check your wiring with a 9v battery. you want forward cone motion with + on sub to + on battery. if you get no motion, that means the coil wiring is screwed up. if the cone goes in, it is wired backwards.
MarkHotchkiss likes this.

Listen. It's All Good.
LTD02 is online now  
post #101 of 240 Old 11-16-2013, 05:30 PM - Thread Starter
Advanced Member
 
atabea's Avatar
 
Join Date: Aug 2008
Posts: 669
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Liked: 54
Quote:
Originally Posted by LTD02 View Post

"From what I have read, it would be best if I wire the voice coils in series for 8 ohms and use the 3000 DSP in bridged mode like this"

there are two ways to wire it and they produce the same result.

1. wire coils in series for 8 ohms per driver. wire drivers in parallel for 4 ohms net. connect to amp and run amp in bridged mode.

2. wire coils in parallel for 2 ohms per driver. wire one driver onto each channel. connect to amp and run amp in stereo mode.

method 2 presents the least confusion with connecting the speakons, I think.

either way, same result.

"are there any other steps I should take while I still have the box open?"

be sure to check your wiring with a 9v battery. you want forward cone motion with + on sub to + on battery. if you get no motion, that means the coil wiring is screwed up. if the cone goes in, it is wired backwards.

Thank you LTD> Although option 2 is the simpler of the two, I am thinking maybe I should go with option one since I will only be using one sub for the time being (most likely until the spring) or until I can build a second. Unless of course there is no disadvantage in running the amp in normal stereo mode and using just one channel.

I picked up three pillows today and I will place them in the cab tomorrow.

regards.
atabea is online now  
post #102 of 240 Old 11-16-2013, 07:26 PM
AVS Special Member
 
chalugadp's Avatar
 
Join Date: Jan 2013
Location: Vancouver, BC, Canada
Posts: 3,948
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 423 Post(s)
Liked: 752
Running in stereo mode will lose almost half the power I think. Need one of the pros to confirm. Its not hard to change the speakon wiring . No soldering involved so I would go with option 1 or 2
chalugadp is online now  
post #103 of 240 Old 11-16-2013, 08:33 PM - Thread Starter
Advanced Member
 
atabea's Avatar
 
Join Date: Aug 2008
Posts: 669
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Liked: 54
Quote:
Originally Posted by chalugadp View Post

Running in stereo mode will lose almost half the power I think. Need one of the pros to confirm. Its not hard to change the speakon wiring . No soldering involved so I would go with option 1 or 2

Thanks Chaluga, I was thinking about running bridged because I only have one sub for now and that seems to be the optimum way to go. when I build the second sub I will worry about changing things around--if necessary. Glad to hear there is no soldering and that it's easy to change the speakon wiring. BTW, I bought the same noctua fan you installed on your amp. Gotta get around to swapping fans too
atabea is online now  
post #104 of 240 Old 11-16-2013, 09:57 PM
AVS Special Member
 
chalugadp's Avatar
 
Join Date: Jan 2013
Location: Vancouver, BC, Canada
Posts: 3,948
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 423 Post(s)
Liked: 752
The fan replacement was this for me
Snipped wires of stock fan , hooked yellow wire positive and white neg . Turn inuke on to ensure wiring is proper . Then I soldered wire together. Covered in shrink wrap. You could buy crimpons to use instead of solder if you want. Make sure fan is pointing inwards . New fan is way quieter .biggrin.gif
chalugadp is online now  
post #105 of 240 Old 11-16-2013, 10:09 PM - Thread Starter
Advanced Member
 
atabea's Avatar
 
Join Date: Aug 2008
Posts: 669
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Liked: 54
Quote:
Originally Posted by chalugadp View Post

The fan replacement was this for me
Snipped wires of stock fan , hooked yellow wire positive and white neg . Turn inuke on to ensure wiring is proper . Then I soldered wire together. Covered in shrink wrap. You could buy crimpons to use instead of solder if you want. Make sure fan is pointing inwards . New fan is way quieter .biggrin.gif

Thanks for the tips! Will do the mod tomorrow.
atabea is online now  
post #106 of 240 Old 11-16-2013, 11:04 PM
AVS Addicted Member
 
LTD02's Avatar
 
Join Date: Oct 2003
Posts: 15,967
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 133 Post(s)
Liked: 852
"Unless of course there is no disadvantage in running the amp in normal stereo mode and using just one channel."

there is no problem using only 1 channel at a time. :-)

Listen. It's All Good.
LTD02 is online now  
post #107 of 240 Old 11-17-2013, 10:32 AM - Thread Starter
Advanced Member
 
atabea's Avatar
 
Join Date: Aug 2008
Posts: 669
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Liked: 54
Quote:
Originally Posted by LTD02 View Post

"Unless of course there is no disadvantage in running the amp in normal stereo mode and using just one channel."

there is no problem using only 1 channel at a time. :-)

That's great to know LTD, guess I will stick to the simplest, idiot-proof method (wire vc for 2 ohms and run in stereo mode). I just placed the pillows inside the cab but did not apply any permanent fasteners so they can be re-positioned if their current location is not optimal.






atabea is online now  
post #108 of 240 Old 11-18-2013, 03:00 AM - Thread Starter
Advanced Member
 
atabea's Avatar
 
Join Date: Aug 2008
Posts: 669
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Liked: 54
^^^^^ I plan on gluing up the last piece of the cab today (top panel) and I just wanted to make sure there are no problems with my placement of the pillows before proceeding. I am concerned there may be too much restriction of air flow.

thanks
Rick
atabea is online now  
post #109 of 240 Old 11-18-2013, 03:37 PM
Senior Member
 
mhutchins's Avatar
 
Join Date: Aug 2006
Location: Austin, TX
Posts: 411
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Liked: 49
Measure the area and see how it compares with the port area. I would shoot for at least 3 x the port area based on a swag. When sonotubes are stuffed with pillows, a portion of the enclosure is completely filled with pillows in the pictures I have seen, with no apparent ill effects.
mhutchins is offline  
post #110 of 240 Old 11-18-2013, 04:16 PM - Thread Starter
Advanced Member
 
atabea's Avatar
 
Join Date: Aug 2008
Posts: 669
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Liked: 54
Thanks Mhutchins,

the net port area (excluding the port braces) is 21 inches wide by 35 1/4 inches deep. looks like I need to add some pillows.


Rick
atabea is online now  
post #111 of 240 Old 11-18-2013, 04:20 PM
AVS Addicted Member
 
LTD02's Avatar
 
Join Date: Oct 2003
Posts: 15,967
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 133 Post(s)
Liked: 852
i'd just pull that one in the middle down, turn it sideways like the others and roll with that. it will seem like it is "blocking" the sound, but the pressure in the cabinet as the driver moves will go right through the pillows except at the resonant frequency that you are trying to kill.

Listen. It's All Good.
LTD02 is online now  
post #112 of 240 Old 11-18-2013, 06:47 PM
AVS Special Member
 
steve nn's Avatar
 
Join Date: Aug 2003
Posts: 6,207
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 425
Turn it/flip it and MRI comes to mind.

Klipsch RB-75
Klipsch C-7
Klipsch RB-35
On-going SW management class
Denon
PS3
steve nn is offline  
post #113 of 240 Old 11-19-2013, 01:30 PM - Thread Starter
Advanced Member
 
atabea's Avatar
 
Join Date: Aug 2008
Posts: 669
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Liked: 54
Hey folks, thanks for all the help with this pillow stuffing bit. I'll just change the orientation of the top pillow as LTD said. I haven't received my SI D4 driver yet but I am planning to wire it for a 2 ohm load and running my inuke 3000DSP in stereo mode, using just one channel (until I can build a second sub). I take it this diagram is correct:



Will I have to change anything in the speakon wires/connectors as well? I am using the NL4MP-UC connector and these wires: http://www.parts-express.com/audio-technica-at700-25-14-awg-speakon-speaker-cable-25-ft--242-5024

Also, what type/guage of wire should I use to wire up the driver?

thanks,

Rick
atabea is online now  
post #114 of 240 Old 11-19-2013, 05:40 PM
AVS Special Member
 
steve nn's Avatar
 
Join Date: Aug 2003
Posts: 6,207
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 425
I like to use 12-14g because it’s so easy to work with. I’m not sure how well it would serve you with your connection though? http://www.monoprice.com/Product?c_id=102&cp_id=10239&cs_id=1023901&p_id=2816&seq=1&format=2 Diagram is correct though.

Klipsch RB-75
Klipsch C-7
Klipsch RB-35
On-going SW management class
Denon
PS3
steve nn is offline  
post #115 of 240 Old 11-19-2013, 06:31 PM - Thread Starter
Advanced Member
 
atabea's Avatar
 
Join Date: Aug 2008
Posts: 669
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Liked: 54
Quote:
Originally Posted by steve nn View Post

I like to use 12-14g because it’s so easy to work with. I’m not sure how well it would serve you with your connection though? http://www.monoprice.com/Product?c_id=102&cp_id=10239&cs_id=1023901&p_id=2816&seq=1&format=2 Diagram is correct though.

Thanks for confirming the diagram, Steve nn. I do have some 12 guage speaker wire but not CL rated though. If it's not an issue, I can use that since I only need a few inches of it to wire the driver and about three feet to connect the driver to the speakon terminals (NL4MP-UC) at the back of the box. Do I have to make any modifications to the speakon wire connectors that go into the amp and the sub?

thanks
Rick
atabea is online now  
post #116 of 240 Old 11-22-2013, 11:15 PM
AVS Special Member
 
steve nn's Avatar
 
Join Date: Aug 2003
Posts: 6,207
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 425
Any new news? Do you plan on building this weekend or just kicking back?

Klipsch RB-75
Klipsch C-7
Klipsch RB-35
On-going SW management class
Denon
PS3
steve nn is offline  
post #117 of 240 Old 11-23-2013, 07:40 AM - Thread Starter
Advanced Member
 
atabea's Avatar
 
Join Date: Aug 2008
Posts: 669
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Liked: 54
Quote:
Originally Posted by steve nn View Post

Any new news? Do you plan on building this weekend or just kicking back?

I anticipated getting my Driver this weekend but I just couldn't make the time to drive to Buffalo (I live in Whitby, which is just east of Toronto). I had it shipped to my friend's sister in the US so I could save a bit of cash. This time I confirmed with her that it IS the right driver (SI sent me the 15 instead of the 18 the first time around) so I don't drive all the way there for nothing. Looks like I will be going next weekend during the black friday sales, so hopefully I could pick up a few other toys while am at it. As for the box, I just have to glue the top panel and paint---which should be done by tomorrow afternoon. Will post some pics. One thing though; I used a 15/16 bit to make the hole for the speakon connector, but for some reason it turned out a bit larger than the diameter of the connector. I bought a pound of duct seal and I hope that would be good enough to adequately seal the area. I have never used duct seal before, are there any special tips for getting good results?

http://www.homedepot.ca/product/duct-seal-1lb-pugs/963529



thanks,
Rick
atabea is online now  
post #118 of 240 Old 11-23-2013, 08:05 AM
AVS Special Member
 
steve nn's Avatar
 
Join Date: Aug 2003
Posts: 6,207
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 425
That’s new to me also, good reviews though. A guy could try it and see how it does? If you have a problem you could always back it up with a thin (but nice looking smile.gif ) sleeve on the back of your sub.

Klipsch RB-75
Klipsch C-7
Klipsch RB-35
On-going SW management class
Denon
PS3
steve nn is offline  
post #119 of 240 Old 11-26-2013, 07:21 PM - Thread Starter
Advanced Member
 
atabea's Avatar
 
Join Date: Aug 2008
Posts: 669
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Liked: 54
I just finished gluing up the last piece of the box and expect to start duratexing tomorrow. Weather permitting, I will be driving to Buffalo on Thursday to pick up the driver and hopefully be back in time to get things installed and running by Sunday. I think I have the fan swap figured out so no problem there. However, in anticipation, I wanted to try and figure out a few things.

1) I understand that I have to set a "High Pass" filter in the amp (3000 DSP). I am not sure how this is done and at which frequency it should be set

2) Where should the gain be set on the amp?

3) I currently have two PSA XV15s and I wonder if I should/can successfully integrate them with this monster of a sub (The PSAs look tiny next to it).

4) Do I have to set the crossover frequency in the amp or should I leave that up to my AVR?

5) Is there any other settings I should be mindful of when setting up?


Thanks

Rick
atabea is online now  
post #120 of 240 Old 11-26-2013, 07:39 PM
AVS Special Member
 
chalugadp's Avatar
 
Join Date: Jan 2013
Location: Vancouver, BC, Canada
Posts: 3,948
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 423 Post(s)
Liked: 752
Quote:
Originally Posted by atabea View Post

I just finished gluing up the last piece of the box and expect to start duratexing tomorrow. Weather permitting, I will be driving to Buffalo on Thursday to pick up the driver and hopefully be back in time to get things installed and running by Sunday. I think I have the fan swap figured out so no problem there. However, in anticipation, I wanted to try and figure out a few things.

1) I understand that I have to set a "High Pass" filter in the amp (3000 DSP). I am not sure how this is done and at which frequency it should be set

2) Where should the gain be set on the amp?

3) I currently have two PSA XV15s and I wonder if I should/can successfully integrate them with this monster of a sub (The PSAs look tiny next to it).

4) Do I have to set the crossover frequency in the amp or should I leave that up to my AVR?

5) Is there any other settings I should be mindful of when setting up?


Thanks

Rick

I can answer a few...

Set the hp filter as crossover at 20hz, but 6 on display for type , plus 3 db with gain.

Turn gains all the way up for inuke .

I have one martysub in the front right and one hsu vtf15 in the front left. Turn on test tones and calibrate them so there 75 db for both subs individually . Then they will be equal at certain hz. Down low your Marty will dominate . Ideally i would have two Marty's but the hsu does a good job of evening out the room.

Set the lp crossover on your avr or preamp.

As for other settings , I used the peq of the inuke at 70,80, and 90 because I wanted a little more midbass . Play around with some eq settings to see what you like. After that do a frequency sweep to even things out. Have fun
chalugadp is online now  
Reply DIY Speakers and Subs

User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off