Kuurslight Posted June 28, 2007 Share Posted June 28, 2007 What you all think are the advantages of 2 smaller woofers vs one large one? Quote Link to comment Share on other sites More sharing options...
ClaudeJ1 Posted June 28, 2007 Share Posted June 28, 2007 What you all think are the advantages of 2 smaller woofers vs one large one? Well if you have two 8 ohm woofers in parallel, they will look like 4 ohms to the amplifier, each sharing the current. You can make a taller box and move the tweeter higher. Two 12's have more cone area the one 15, so the IM distortion will be lower or you can have lower bass at the same distortion, or louder at the same distortion.You can have slightly different woofers, where their characteristics wold blend into a smoother sound. Need I say more? Quote Link to comment Share on other sites More sharing options...
Kuurslight Posted June 28, 2007 Author Share Posted June 28, 2007 Makes sense one the electrical part. But im not talking about 2 12" vs one 15" more on the lines on 2 6" vs one 12 same space but 2 different woofers. Quote Link to comment Share on other sites More sharing options...
djk Posted June 28, 2007 Share Posted June 28, 2007 Two 6s will only have half the cone area of a single 12, and not likely to have as much cone travel either. Might be OK for mids, but not for bass (in my house). Quote Link to comment Share on other sites More sharing options...
tigerwoodKhorns Posted June 28, 2007 Share Posted June 28, 2007 Makes sense one the electrical part. But im not talking about 2 12" vs one 15" more on the lines on 2 6" vs one 12 same space but 2 different woofers. Exponential relationship. Try 2 8" woofers (still less area than 1 12") Quote Link to comment Share on other sites More sharing options...
DrWho Posted June 28, 2007 Share Posted June 28, 2007 Makes sense one the electrical part. But im not talking about 2 12" vs one 15" more on the lines on 2 6" vs one 12 same space but 2 different woofers. Are you building a speaker or trying to judge a speaker purchase? You're talking 18pi versus 36pi (you'd need four 6" drivers to keep up with a 12"). Also keep in mind the effects on polar response too... Quote Link to comment Share on other sites More sharing options...
j-malotky Posted June 28, 2007 Share Posted June 28, 2007 Also keep in mind the effects on polar response too... So they should only be used in the Artic? [*-)] In English, any time you have more than one driver doing the same thing you have a better chance of receiving varying signals to your ears. First each speaker is a different distance from your ear. And second, if there are any varriations in performace, each cone will not be vibrating identically. Getting multiple signals is NOT a good thing. IMO - Use a single driver whenever you can. JM Quote Link to comment Share on other sites More sharing options...
JJkizak Posted June 28, 2007 Share Posted June 28, 2007 So I guess that means the Jubilee is not the speaker to purchase. JJK Quote Link to comment Share on other sites More sharing options...
Guest " " Posted June 28, 2007 Share Posted June 28, 2007 "You're talking 18pi versus 36pi (you'd need four 6" drivers to keep up with a 12")." does that "math" out correctly? I always thought that 4 six inch speakers were approx equal to one 10" Quote Link to comment Share on other sites More sharing options...
DrWho Posted June 28, 2007 Share Posted June 28, 2007 Dual 12's in the Jubilee outperform a single 15. There's a lot more at play there and is really not apples to apples. A good horn designer gets to control the directivity with the shape of the horn...something you can't do with a direct radiating system. Directivity is also frequency dependant. The higher the frequency, the more it beams. The amount it beams will be dependant upon the distance between acoustic sources. So basically, by stacking two woofers on top of each other, you will narrow the vertical directivity and the horizontal won't change (or will become slightly wider if you go with smaller drivers). Sometimes it is advantageous to move to multiple drivers and use the beaming to control directivity. You just don't want the drivers so far apart that you run into comb-filtering...I believe the basic rule of thumb is an interdriver spacing no greater than 1/2 wavelength. At 1kHz, that comes to 6 inches. Quote Link to comment Share on other sites More sharing options...
DrWho Posted June 28, 2007 Share Posted June 28, 2007 "You're talking 18pi versus 36pi (you'd need four 6" drivers to keep up with a 12")." does that "math" out correctly? I always thought that 4 six inch speakers were approx equal to one 10" Area is a squared relationship with radius....so cut the radius in half and you've got 1/4 the area. Not all same diameter drivers are equal though. Different kinds of suspensions and radiating areas are going to contribute differently to the 'effective' surface area. I've never sat down to look at general Sd's for real systems, but I'm pretty sure quad 6's are gonna come closer to a 12" driver than a 10"... Quote Link to comment Share on other sites More sharing options...
Guest " " Posted June 28, 2007 Share Posted June 28, 2007 interesting...it's actually pretty close...not accounting for adjustments 4 six inch drivers=112 1 twelve inch driver =113 Quote Link to comment Share on other sites More sharing options...
Kuurslight Posted June 29, 2007 Author Share Posted June 29, 2007 Im replacing my 15" Cerwin Vegas with RF-52s or 62s not sure yet. I like good clear sound but I also love the brutal output of my vegas will 62s compete with them in that aspect or should i keep my 15s for the times I just want to crank it up? Quote Link to comment Share on other sites More sharing options...
DrWho Posted June 29, 2007 Share Posted June 29, 2007 Is there any reason in particular that you're looking at the Reference lineup? A good pair of Heritage will blow most anything outta the water... At the very least I would try to upgrade to RF-82's or RF-83's if you wanted an all around speaker that does most everything. Quote Link to comment Share on other sites More sharing options...
Kuurslight Posted June 29, 2007 Author Share Posted June 29, 2007 Money and space. 15s are to large for my home theater. Quote Link to comment Share on other sites More sharing options...
Jay481985 Posted June 29, 2007 Share Posted June 29, 2007 Silly me asking but are you going to use a subwoofer or maybe later or not at all? Quote Link to comment Share on other sites More sharing options...
mas Posted June 29, 2007 Share Posted June 29, 2007 You just don't want the drivers so far apart that you run into comb-filtering...I believe the basic rule of thumb is an interdriver spacing no greater than 1/2 wavelength. At 1kHz, that comes to 6 inches. Doc, make that 1/4 wavelength for best coupling, center to center inter-driver spacing; or within 1/8 wavelength from an adjacent wall surface. [] Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted June 29, 2007 Share Posted June 29, 2007 piR2, 6" driver 3x3x 3.14159 = 28.27, 2 of those is 56" 12" driver 6x6x3.14159 - 113.10 DJK is correct- a single 12" driver is about TWICE the flat cone area as two 5" I've done the math on Ref series. 2x10 EQUALS 3x8 so the big Ref towers are fairly similar in that regard. Quote Link to comment Share on other sites More sharing options...
Roc Rinaldi Posted June 29, 2007 Share Posted June 29, 2007 Also keep in mind the effects on polar response too... So they should only be used in the Artic? [*-)] In English, any time you have more than one driver doing the same thing you have a better chance of receiving varying signals to your ears. First each speaker is a different distance from your ear. And second, if there are any varriations in performace, each cone will not be vibrating identically. Getting multiple signals is NOT a good thing. IMO - Use a single driver whenever you can. JM Now you have me worried. I opted to get a second identical subwoofer. I have them set up as master/slave. Do I have much to worry about as to polar response? Would the subs sound better in Alaska or Antartica as opposed to Baltimore? I am willing to move for the sake of the sound. Quote Link to comment Share on other sites More sharing options...
jacksonbart Posted June 29, 2007 Share Posted June 29, 2007 I have them set up as master/slave. Do I have much to worry about as to polar response? Would the subs sound better in Alaska or Antartica as opposed to Baltimore? Roc, I think they would sound better in Miami, where Dominatrics goes over big in the southbeach community. Quote Link to comment Share on other sites More sharing options...
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