Idunn build for a Newbie: Questions - AVS | Home Theater Discussions And Reviews

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DIY Speakers and Subs

Jetfire Jr's Avatar Jetfire Jr
12:39 PM Liked: 10
post #1 of 5
01-21-2013 | Posts: 9
Joined: Dec 2012
I've been into car audio off and on for a while (mid 90's) and I'm finally ready for good tunes in the house. I'm a DIY'er in general and want to build my first set of speakers. I choose the Idunn, because I wanted to start out with a kit to make things easier on myself and it just exceeded my inital budget, it was close enough for me to get the green light. I will be building my own cabinets for these.

Idunn:
I planned to buy the "optional excessories package" as well.

The W.A.F. is huge for this build, so I'm limited to a small area for the speakers to go. My available space for each speaker is to the right and left of the TV. I end up with 10" wide x 45" high x 19" deep. I tried to include a picture of the TV area......how do I attach a photo?

Questions:
  1. I will be placing the speakers close to the wall, will I need to move to a sealed design or does the port in front remove that issue?
  2. The speakers will sit on top of the TV stand that is 19" high, what is a good listening height? The primary listening position will be on the couch. I was thinking about adding "false height" to the box to bring the speakers up without stands.
  3. Could I increase any of the box dimensions to bring out more bass? Would this require changes in the X-over? I have no X-over experience. I will add a sub eventually........extended bass is not necessary.

I'm ready to order my kit in the next week or two. I looked at building the ER18DXT by Mark K., but wanted to stick to a kit the first time out. Thanks in advance!
BassThatHz's Avatar BassThatHz
01:57 PM Liked: 505
post #2 of 5
01-22-2013 | Posts: 3,665
Joined: Apr 2008
Technically the port has no relationship with the wall; sealing it just rolls off any near-tune hump that may exist; which may or may not help in relation to the wall.

Increasing box size increases efficiency and excursion yes, but is only really effective if your box is fairly small box to start with.
Jetfire Jr's Avatar Jetfire Jr
03:21 PM Liked: 10
post #3 of 5
01-22-2013 | Posts: 9
Joined: Dec 2012
Quote:
Originally Posted by BassThatHz View Post

Technically the port has no relationship with the wall; sealing it just rolls off any near-tune hump that may exist; which may or may not help in relation to the wall.

Increasing box size increases efficiency and excursion yes, but is only really effective if your box is fairly small box to start with.

I thought that sealed or forward firing port were best for near wall placement. Should I look into a modified x-over for my near-wall placement? Since I haven't ordered yet, maybe Madisound could help me out with that?

Since I'll add a sub later, I'll stick with the designed box dimensions my first time out. Thanks.
Bill Fitzmaurice's Avatar Bill Fitzmaurice
03:41 PM Liked: 1807
post #4 of 5
01-22-2013 | Posts: 10,615
Joined: Nov 2009
Quote:
Originally Posted by Jetfire Jr View Post

I thought that sealed or forward firing port were best for near wall placement.
Only if you can't allow for at least one port diameter between the cab and the wall
Quote:
Should I look into a modified x-over for my near-wall placement?
Does it incorporate BSC? If not there's no need. If so remove those components.
Jetfire Jr's Avatar Jetfire Jr
04:27 PM Liked: 10
post #5 of 5
01-22-2013 | Posts: 9
Joined: Dec 2012
Quote:
Originally Posted by Bill Fitzmaurice View Post

Only if you can't allow for at least one port diameter between the cab and the wall
Does it incorporate BSC? If not there's no need. If so remove those components.

The box is around 10" deep and I have 19" of space to the back wall. Does BSC = baffle step compensation? If so, I'm not sure.......here's a link to the design http://www.seas.no/index.php?option=com_content&view=article&id=274&Itemid=248
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