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#400149 - 01/16/14 12:44 PM Looking for your input on new video!
Andrew Offline
Axiom Engineer
veteran

Registered: 12/18/01
Posts: 176
Hi everyone,

Our last Axiom information video covered the fairly simple topic of port plugs and we have been very pleased with the discussion that it has generated. In that same vein we are currently preparing for a video on the basics of speaker placement and positioning and would love to get your input on the topic. Is there a question within that subject that you've always wanted to ask but maybe felt it was too basic? You can post your questions in this thread or PM me directly, in case you're too sheepish about asking in public! I can't promise that we will be able to cover everything in the first video, but it would be great if we could make this a regular event as we plan more videos. Answering questions on topics that you're interested in is the purpose of these videos in the first place!

Thanks for your input,

Andrew

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#400151 - 01/16/14 01:02 PM Re: Looking for your input on new video! [Re: Andrew]
exlabdriver Offline
connoisseur

Registered: 09/07/11
Posts: 1029
Andrew:

Axiom's previous vids have been great. The last one on the Plugs prompted me to experiment with a couple of DIY Plugs that completely cured the excessive bass issue with my M3s.

The subject of basic speaker placement would be most welcome; however, over the years with my systems, WAF & aesthetics seem to rule where my speakers are placed for the best visual impact...

TAM

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#400158 - 01/16/14 03:47 PM Re: Looking for your input on new video! [Re: Andrew]
brwsaw Online   happy
connoisseur

Registered: 10/12/12
Posts: 1050
I'd like to see specific points on dealing with compromises seen and or heard in small or narrow rooms as they relate to the front sound stage.
For example, is it worth while to copy 2 channel listening layouts for the front sound stage in an HT (simply add the center)?
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#400168 - 01/16/14 09:14 PM Re: Looking for your input on new video! [Re: Andrew]
dakkon Offline
connoisseur

Registered: 02/08/04
Posts: 1846
Andrew,

It would be interesting if you could convey the principles that Wilson Audio cover in their manuals.. As seen in section 2.1 starting on page 15.

http://www.wilsonaudio.com/pdf/manual_soph3.pdf

I think this is a wonderful topic for a video, if you're able to convey the true importance of placement.

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#400171 - 01/16/14 11:29 PM Re: Looking for your input on new video! [Re: Andrew]
tomtuttle Offline
axiomite

Registered: 06/20/03
Posts: 8290
Loc: Tacoma
Toe-in, vertical positioning for bookshelves, first reflection points. You could do a whole episode on center channels.
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#400174 - 01/17/14 02:36 AM Re: Looking for your input on new video! [Re: Andrew]
CV Online   confused
Founder, Axiom Upgrade Club
shareholder in the making

Registered: 07/20/06
Posts: 11208
Loc: Richland, WA, USA
Should I experiment with facing my LFR1100s the other way so I can see your signatures all of the time?

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#400836 - 02/09/14 07:32 AM Re: Looking for your input on new video! [Re: Andrew]
Strider53 Offline
old hand

Registered: 04/11/12
Posts: 81
Loc: Detroit
Hi Andrew, many thanks for bringing this subject up. This isn't a question but did get me wondering just how poor of a decision I'd made concerning my centre channel position so I did a little experimenting.
Took a laser pointer, protractor, tape measure, checked the angle which the centre was projecting into my room, at what height was it really directed.
Was clear it's present position was pointing at the legs of anyone in the first row, fine if you were sitting in a bean bag on the floor, not so much sitting in the chair. So, I have scrap oak laying around from other projects. Used some to fabricate a stand with some height adjustable speaker stand spikes. Can't say I've noticed a night/day difference with the new stand but voices sound better, clearer is the best word to describe the change. So again, thanks for the idea, looking forward to your Video on the subject.
/Jeff
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#402096 - 03/23/14 11:22 AM Re: Looking for your input on new video! [Re: Andrew]
michael_d Offline
connoisseur

Registered: 07/23/04
Posts: 3904
Loc: Up yonder
I've always been afraid to ask just what the heck "comb filtering" means. It's mentioned all the time whenever the center channel subject comes up. I've seen/read a couple papers on it, but still don't get it.
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#402138 - 03/24/14 02:06 PM Re: Looking for your input on new video! [Re: michael_d]
CatBrat Offline
axiomite

Registered: 08/05/09
Posts: 5876
Loc: Milky Way Galaxy
Originally Posted By: michael_d
I've always been afraid to ask just what the heck "comb filtering" means. It's mentioned all the time whenever the center channel subject comes up. I've seen/read a couple papers on it, but still don't get it.


I think I've experienced it. Send a test signal sent through the main speakers by using a CD with these tracks on it. Walk slowly across the path of the mains holding a sound meter pointed at the front of the room where mains are at. The reading will vary up and down as you walk across, but will remain steady when you stop at any point.

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#402139 - 03/24/14 02:27 PM Re: Looking for your input on new video! [Re: Andrew]
exlabdriver Offline
connoisseur

Registered: 09/07/11
Posts: 1029
Using only my ears, I found that experimenting with 3 brands of horizontal WTW types (including my VP100) that there was negligible sound deficits in my room until past 30 degrees off axis.

While 'comb filtering' is certainly present in virtually all horizontal speaker designs, in the real world in most rooms it probably is minimal unless one gets way off axis. I didn't even bother experimenting with my new VP160 because I knew that there would be no or little degradation of sound within our listening area. Perhaps my odd shaped room helps as well...

TAM

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