Lets talk Audio -- How are you guys riging up the serious sound?

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MikeW:
I installed 2 sound cards in my cabinet.
1 outputs to a Altec Lansing sub/sat system in my cabinet in the usual locations.
The other goes to my Lexicon home theater processor.
I did this so I could play a game and use the MAME pc as a jukebox at the same time. This allows me to adjust the cabinet volume seperatly from the music so I am not listening to Galaga sounds at 105db (:

I have a fairly large collection of music on my MAME pc, I think around 85GB. I wanted access to play it on my home system but I don't do it very much as I have a fairly high end system and anything compressed sounds like crap. Even stuff at 192 bit rate stinks.

BillyJack:
Any solutions for DIY magnetic shielding? I could use a little help with a home theater project...

/threadjack

BillyJack

tritonarcade:

--- Quote from: BillyJack on June 11, 2003, 10:15:21 am ---Any solutions for DIY magnetic shielding? I could use a little help with a home theater project...

/threadjack

BillyJack

--- End quote ---

Okay, I can actually help with this. There are two ways to shield your speaker - using "bucking magnets" and using a material called "MuMetal". The former will cost you about $2 at PartsExpress, and the latter something like $17 per square foot. I purchased both to run some tests, and the bucking magnet had significantly more impact on protecting my CRT from distortion.

So then, what is a bucking magnet? Simply a magnet of approx. 1/2-3/4 of your speaker magnet's size that you attach to the rear of the magnet. The poles of the bucking magnet must be reversed (i.e. so it is NOT attracted to the speaker magnet). That's right, use industrial adhesive to stick the sucker on there and you'll be set. And in case you're wondering, no this has no impact on the sound quality of the speaker.

I have 4" Infiniti Kappa speakers that wreak havoc on the CRT without any shielding. With the bucking magnet I can see no visible distortion at most angles, and lucklily in my setup the angle of the speaker mount has the magnet pointing away from the CRT.

By the way my "scientific method" of testing these materials involved waving the speaker magnet around a 12" TV approx. the same distance from the CRT as my speakers will be in the cab. ;D If you wanted to get really scientific, you need to buy a "Gauss Meter" which can detect levels of EMF in the 7th dimension.. okay I made that last part up.

http://www.audiovideo101.com/learn/askus/displayaskus.asp?questionid=89&List=6

SS427:
Don't want to get to off topic here, but has anyone used a dedicated computer power supply (like a atx 550, 24A, 12V) to power an amp and speakers? I have come across a few articles on this.

On the magnetic shielding, it may just depend on how strong the field is. One person I talked to about hooking speakers up had two 10's below the monitor and two 6x9 above and didn't have any interference problems. Some articles I've come across used ferrite materials (plain old steel sheets, the thicker the better) to reduce the field effects from the magnets. Non-ferrite (copper, aluminum, etc.) materials supposedly have no effect on the magnetic field. I've not verified any of this, just what I've come across searching for speaker shielding.

ss

tritonarcade:

--- Quote from: SS427 on June 11, 2003, 01:51:37 pm ---Don't want to get to off topic here, but has anyone used a dedicated computer power supply (like a atx 550, 24A, 12V) to power an amp and speakers? I have come across a few articles on this.

--- End quote ---

Actually I have wondered about how I will be powering my setup as well. The plan was to go get an AT power supply so it would power on without needing a on/off momentary switch. Otherwise one could just wire the same on/off switch to both the computer PSU and the speaker PSU.

What did you find in those articles? Any do's/don'ts?

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