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Infinity speaker rebuild #4757881
05/15/18 11:23 AM
05/15/18 11:23 AM
Joined: Feb 2008
Posts: 1,065
MA.
Camprunner Offline OP
Camprunner  Offline OP
Joined: Feb 2008
Posts: 1,065
MA.
About six months ago I picked up a set of Infinity Speaker cabinets this guy had in front of his house. They are real nice but have no speakers in them no crossovers nothing they are Infinity Kappa 6.1 speakers built sometime in the early 90's. The cabinets are like new so do you think it's worth it to get some aftermarket crossovers and drivers put it all together and see how it sounds? It will prob cost around $275-350.00 each speaker to do it right that's new tweeter, midrange, woofer and crossover from an aftermarket company since the original drivers and crossovers are no longer available.

Re: Infinity speaker rebuild [Re: Camprunner] #4757891
05/15/18 11:37 AM
05/15/18 11:37 AM
Joined: Oct 2002
Posts: 36,770
Great Lakes
Quattro Pete Offline
Quattro Pete  Offline
Joined: Oct 2002
Posts: 36,770
Great Lakes
Sounds like a cool project, if you like to tinker. This PDF has a schematic of the original setup in case you don't have it:
http://www.infinity-classics.de/technik/manuals/Kappa_6.1_technical_sheet.pdf

I just don't know how easy it would be to achieve a flat frequency response using aftermarket components.

$700 can probably get you a somewhat decent set of floor standing speakers these day, but you won't have the satisfaction that you built them yourself, and the enclosures may not be of high quality.

I snagged a pair of Jamo C607 towers from Amazon a few years back for around $600. Pretty nice for the price.




'02 530i (Edge 0W-40)
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Re: Infinity speaker rebuild [Re: Camprunner] #4757931
05/15/18 12:36 PM
05/15/18 12:36 PM
Joined: Feb 2010
Posts: 4,838
Central Texas
sleddriver Offline
sleddriver  Offline
Joined: Feb 2010
Posts: 4,838
Central Texas
If you have $700 to spend and want to DIY, I'd suggest paying for a completed design (drivers + XO), then building a cabinet or modifying the ones you found. Mis-matching a woofer to an enclosure will result in large, uneven bass especially if you "stuff" it in. Big mistake. It will be sort of like playing ring toss from 80 feet.


1998 Volvo V70 T5 228,880 mi. Original Owner.
M1 10W-30 HM
"It's never a mistake to buy tools, defined broadly. They're not a cost, they're an investment." - J.B. Peterson
Re: Infinity speaker rebuild [Re: Quattro Pete] #4757945
05/15/18 01:10 PM
05/15/18 01:10 PM
Joined: Jan 2013
Posts: 400
West Yorkshire, UK
NGRhodes Offline
NGRhodes  Offline
Joined: Jan 2013
Posts: 400
West Yorkshire, UK
Originally Posted By: Quattro Pete


I just don't know how easy it would be to achieve a flat frequency response using aftermarket components.




A small investment in software can get very good speaker design tools; as crossovers are fully mathematically modelled, you can get a very good design that will behave very similar to designed after implementation.

diyaudio and audiokarma are 2 really good forums full of useful information and advise.

Re: Infinity speaker rebuild [Re: Camprunner] #4757991
05/15/18 01:58 PM
05/15/18 01:58 PM
Joined: Dec 2002
Posts: 6,606
Huntington Beach, CA
tenderloin Offline
tenderloin  Offline
Joined: Dec 2002
Posts: 6,606
Huntington Beach, CA
These guys know their stuff..at least they did a few years ago..

Speaker City USA

Re: Infinity speaker rebuild [Re: Camprunner] #4758238
05/15/18 07:44 PM
05/15/18 07:44 PM
Joined: May 2012
Posts: 1,406
Georgia
AVB Offline
AVB  Offline
Joined: May 2012
Posts: 1,406
Georgia
I would do it, but I don't think that I would invest that much in them. I would go to parts express or ebay and pick out some drivers and crossovers.

Re: Infinity speaker rebuild [Re: AVB] #4761924
05/19/18 11:05 AM
05/19/18 11:05 AM
Joined: Jun 2011
Posts: 1,189
Texas
wag123 Offline
wag123  Offline
Joined: Jun 2011
Posts: 1,189
Texas
Originally Posted By: AVB
I would do it, but I don't think that I would invest that much in them. I would go to parts express or ebay and pick out some drivers and crossovers.

+1
Stick with Parts Express. They have quite a bit of advice and reviews to help you as well as excellent free technical support. If you call them they should be able to recommend the appropriate components for your speakers.
Otherwise, do some research and calculations, pick the woofer drivers based on the characteristics of the cabinets, they MUST match the cabinets if you expect to get good sound from them. If memory serves, the Kappa 6.1's used a base reflex (ported) enclosure that uses rather oddly designed/shaped ports, this is going to complicate your woofer choice and you may need to modify the ports to get them to properly match the woofer drivers that you choose. You could even seal the cabinets and make them into acoustic suspension speakers if you use the correct woofer drivers. Also, the crossovers in the cabinets likely won't work for your replacement drivers, so the replacement crossovers you choose MUST be a match for the mid range and tweeter drivers that you choose.
Don't worry about how inexpensive the drivers are that you choose, you don't have to spend a fortune to get good sound if all the components match with each other and cabinet properly.

Re: Infinity speaker rebuild [Re: Camprunner] #4763195
05/20/18 04:00 PM
05/20/18 04:00 PM
Joined: May 2009
Posts: 2,342
WA (USA)
Y_K Offline
Y_K  Offline
Joined: May 2009
Posts: 2,342
WA (USA)
On a sidenote: you could get 2 pairs of used Vandersteen 2Cx series for the money you'll spend on a decent restoration. Although, DIY is a great therapy.

Re: Infinity speaker rebuild [Re: Camprunner] #4766823
05/24/18 10:25 AM
05/24/18 10:25 AM
Joined: Nov 2003
Posts: 1,225
Middle of Iowa
DriveHard Offline
DriveHard  Offline
Joined: Nov 2003
Posts: 1,225
Middle of Iowa
I would have to say no...

You would be designing backwards...finding drivers to work in an enclosure...which is VERY difficult. You always start with your drivers, then design the enclosure and crossover network. This is especially true if they are ported enclosures.

I you insist on finding drivers for your enclosure, I would seal up the existing porting, and consider re-porting to proper dimensions for your box size and tuning frequency, and remember you can add bracing and materials to the enclosure to reduce its volume if needed...that way you at least have some flexibility.

Google for WinISD Pro...that is a good free program to help in basic enclosure and crossover design.

Good advice above to head to Parts Express for drivers and components.


Smile, it increases your face value
2013 Fiat 500 Abarth mod heavy (my DD)
2018 Alfa Romeo Stelvio TI Sport (wife's)
2011 Silverado Crew Cab LT 6.2L/6spd (tow pig)
2007 Nissan Xterra (trail toy)
Re: Infinity speaker rebuild [Re: Camprunner] #4767036
05/24/18 02:26 PM
05/24/18 02:26 PM
Joined: Mar 2010
Posts: 654
NY
mx5miata Offline
mx5miata  Offline
Joined: Mar 2010
Posts: 654
NY


NAPA FULL SYNTHETIC 0w20 Partsplus oil filter
Wix air filter
Re: Infinity speaker rebuild [Re: Camprunner] #4767195
05/24/18 05:16 PM
05/24/18 05:16 PM
Joined: May 2012
Posts: 1,406
Georgia
AVB Offline
AVB  Offline
Joined: May 2012
Posts: 1,406
Georgia
I didn't know mavin had a website. That is who I had in mind when I mentioned ebay.

Re: Infinity speaker rebuild [Re: AVB] #4772750
05/30/18 07:57 PM
05/30/18 07:57 PM
Joined: Mar 2010
Posts: 654
NY
mx5miata Offline
mx5miata  Offline
Joined: Mar 2010
Posts: 654
NY
Did you check out mavin?


NAPA FULL SYNTHETIC 0w20 Partsplus oil filter
Wix air filter
Re: Infinity speaker rebuild [Re: Camprunner] #4773155
05/31/18 08:58 AM
05/31/18 08:58 AM
Joined: Dec 2014
Posts: 1,325
California
Vuflanovsky Offline
Vuflanovsky  Offline
Joined: Dec 2014
Posts: 1,325
California
Personally, I wouldn't spend ~$300 per speaker to get questionable results versus either putting that toward new speakers or utilizing a company/site that specializes in the drivers/modules for those particular speakers. For example, I have a pair of mid-70s EPI 150s that a company will retool with product that's designed for those speakers for around $150/each.

If I spent $600 to refurbish a pair of early 90s Infinity floor standers, I'd probably only do that if the DIY route or getting them refurbished/operational meant more to me than putting that money toward something newer and better.


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