Wanted: Comments & Suggestions on this My First Speaker Project
My objective here is to build a pair of home theater speakers to flank my 36” flat screen. To drive my new speakers, I currently have a JVC Audio/Video Receiver RX-8030VBK (6 X 130W per channel) The amp has several digital optical inputs that can be
hooked up to the soundcard of my home computer which manages a very large collection of MP3 files.
My box size calculations came from quick study of some web sites and forums. Since math is not a strong point with me, please
take a look at my “guess work” and holler, NO YOU IDIOT! If you care to take the time to give advice to me, please keep in mind that unlike most of you, I have limited knowledge when it comes to Thiele-Small data and it’s affect on drivers and their output performance. Some of you are sure to say I’m building the boxes a bit large, but I did this for future upgrades to 10” woofers (don’t want to build new cabinets). You also need to know some info about room size and listening preferences.
Folks at my house never listen to REALLY LOUD music. We enjoy 4 to 5 DVD movies each week, and music plays during times the TV is not being watched. Our “Theater” room measures 26 X 12 with the TV screen backed up to the middle of one of the long walls, the floor is finished wood on a pier & beam foundation.
I’ve listed the products I’ve picked out to suite my meager budget and these are all I can afford at this time. I know there is better quality stuff out there, but I still have to put two more brats through college soon. I’m always asking my wife, “who wanted all these d$#n kids anyway”?
Budget $300 each speaker.
2 - GOLDWOOD GW-8PC-30-8 8" HEAVY DUTY WOOFER 8 OHM $40 ea.
SPECS: 120 watts RMS/230 watts max, Voice coil diameter: 1-1/2", Le: .99 mH, Freq. response: 45-7,000 Hz, Re: 7.24 ohms,
Magnet weight: 30 oz, Fs: 55 Hz, SPL: 88 dB 2.83W/1m, Vas: .51 cu. Ft, Qms: 4.2, Qes: .62, Qts: .56, Xmax: 3.21mm
2 - EMINENCE LA6-CBMR 6-1/2" SEALED BACK MID RANGE $75 ea.
SPECS: 150 watts RMS, VCdia: 1.5", Le: 0.33 mH, Impedance: 8 ohms, Re: 6.3 ohms, Freq. range: 500-5,000 Hz, Magnet weight: 38 oz, Fs: 460 Hz, SPL: 98 dB, Vas: 0.013 cu. Ft, Qms: 3.13, Qes: 1.24, Qts: .89, Xmax: 0.2 m
2 - VIFA XT25SC30-04 SHIELDED DUAL CONCENTRIC DOME TWEETER $80 ea.
SPECS: 100 watts RMS/140 watts max, Znom: 4 ohms, Re: 3.0 ohms, Freq. range: 1,500-40,000 Hz, Magnet weight: 8.5 oz,
Fs: 500 Hz, SPL: 91.5 dB 2.83V/1m
2 – CROSSOVERS (Parts Express #260-231) $40 ea.
SPECS: The woofer section rolls off 6 dB at 800 Hz while the tweeter section uses a 12 dB per octave roll off at 4,500 Hz. The midrange section uses a true band pass filter with a response of 750-5,000 Hz. 12 dB per octave roll off. All crossover frequencies are rated into an 8 ohm load
2 - DAYTON AUDIO GOLD BINDING POST PAIR (Parts Express #091-1245) $15
SPECS: The binding posts can be used with banana plugs or will accept wire up to 8 gauge. Extra long rear bolt (1-1/2”) for mounting in speaker cabinets with walls up to 1” thick. Overall length is 2-1/4”. Sold in color coded pairs with solder tabs.
2 – ACOUSTA-STUF POLYFILL 1 LB. BAG $20
1 - 4’ X 8’ X ¾” Medium Density Fiberboard $38
Box inside dimensions of 25”H X 15”W X 12”D gives a volume of 2.6 cubic feet leaving a bit over 500 cubic inches
to be taken up by wood bracing and the speakers. Port 3” X 6.25
This is my first post, Thanks for your time. BluesAreBest