dipole with non intentical drivers..

smak · 16th December 2005, 08:40 PM

i went and picked up another pair of pyle ppa15 drivers to fill out another channel in my stereo sound system but to my dismay the model seems to have been revised.

my origionals had a regular black paper cone and slightly larger vent area over the voice coil.. the new ones have some sort of textured coating over the back of the cone (although its still paper) and the front has alot more gloss to it. much stiffer cone, although part of this may be because my origionals have been broken in over the past year in a mono w-frame.

would it still be a good idea to use them in my setup? i figured i would have one of the newer subs facing forward coupled with an older one facing back in the first h-frame (polarity reversed) and then the opposite on the other side to maintain cancellation benefits.

or should i just bite the bullet and get another 2 of the newer drivers and ditch the old ones altogether?

richie00boy · 16th December 2005, 08:45 PM

Surely all you need to do is use the old ones as a pair push-pull on one side and the new ones on the other side

smak · 16th December 2005, 08:59 PM

but then the channels will sound different.

at least by mixing up the drivers a bit it blends the differences a bit no?

richie00boy · 17th December 2005, 10:05 AM

The wavelengths of the bass reproduced by the bins will be so long that the blending of the sound will be done simply by playing them in a room.

If you pair up the drivers as you suggested they will not function as true dipoles as they won't exactly complement each other.

Rudolf · 17th December 2005, 01:56 PM

Quote:

Originally posted by richie00boy
If you pair up the drivers as you suggested they will not function as true dipoles as they won't exactly complement each other.

You won´t get the (purported) cancellation of harmonic distortion, but apart from that every driver will work as a dipole on its one. For best acoustic balance I would pair different drivers in each h-frame.

opp · 18th December 2005, 07:26 PM

Re-use the old ones – absolutely. And use the saved money for eg. larger a power amplifier. Agree with Rudolf - symmetry crucial.

smak · 19th December 2005, 03:16 AM

ugh, i've got all the power i can handle for now..

maybe i can find a new home for the old drivers to cover some of the cost of the new..

something about having two channels with different characteristics doesent sit well with me..

thnx for the replies guys, i'll swap the drivers around until the new ones are purchased.

p.s. any torontonians or ontarians want to purchase two broken in 15" dipole subwoofer canidates?

16th December 2005, 08:40 PM	#1
smak diyAudio Member Join Date: May 2003 Location: Toronto, Canada	dipole with non intentical drivers.. i went and picked up another pair of pyle ppa15 drivers to fill out another channel in my stereo sound system but to my dismay the model seems to have been revised. my origionals had a regular black paper cone and slightly larger vent area over the voice coil.. the new ones have some sort of textured coating over the back of the cone (although its still paper) and the front has alot more gloss to it. much stiffer cone, although part of this may be because my origionals have been broken in over the past year in a mono w-frame. would it still be a good idea to use them in my setup? i figured i would have one of the newer subs facing forward coupled with an older one facing back in the first h-frame (polarity reversed) and then the opposite on the other side to maintain cancellation benefits. or should i just bite the bullet and get another 2 of the newer drivers and ditch the old ones altogether?

16th December 2005, 08:45 PM	#2
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Surely all you need to do is use the old ones as a pair push-pull on one side and the new ones on the other side __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

17th December 2005, 10:05 AM	#4
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	The wavelengths of the bass reproduced by the bins will be so long that the blending of the sound will be done simply by playing them in a room. If you pair up the drivers as you suggested they will not function as true dipoles as they won't exactly complement each other. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

18th December 2005, 07:26 PM	#6
opp diyAudio Member Join Date: Jul 2005 Location: Aros	Re-use the old ones – absolutely. And use the saved money for eg. larger a power amplifier. Agree with Rudolf - symmetry crucial. __________________ time flies like an arrow ... and fruit flies like a banana

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16th December 2005, 08:59 PM	#3
smak diyAudio Member Join Date: May 2003 Location: Toronto, Canada	but then the channels will sound different. at least by mixing up the drivers a bit it blends the differences a bit no?

19th December 2005, 03:16 AM	#7
smak diyAudio Member Join Date: May 2003 Location: Toronto, Canada	ugh, i've got all the power i can handle for now.. maybe i can find a new home for the old drivers to cover some of the cost of the new.. something about having two channels with different characteristics doesent sit well with me.. thnx for the replies guys, i'll swap the drivers around until the new ones are purchased. p.s. any torontonians or ontarians want to purchase two broken in 15" dipole subwoofer canidates?

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