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Infinity Kappa 8 woofer frequency and ohm load

1gr8e320a

1gr8e320a

Active Member
Fellow Members: I want to replace the woofers in my Infinity Kappa 8s - there's nothing wrong with them - just a little long in the tooth these days. Therefore, my question is, Does anyone know that the frequency response and ohm load is for the original that is in the speaker now? Regards, Robert
 
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1gr8e320a said:
Fellow Members: I want to replace the woofers in my Infinity Kappa 8s - there's nothing wrong with them - just a little long in the tooth these days. Therefore, my question is, Does anyone know that the frequency response and ohm load is for the original that is in the speaker now? Regards, Robert
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Veeeeeery cryptic.........." just a little long in the tooth these days " Why fix it if it is not broken!:worried::confused:
 
If they still work just fine, you are much better off sticking with the original woofers.
 
I've been very successful in replacing all the other drivers (tweeters, midranges and mid-bass drivers) with highend Aurum Cantus and Morel. I'm contemplating a woofer that has the following specs. *Impedance: 8 ohms *Re: 6.45 ohms *Frequency range: 25 - 1,000 Hz. I dont know but something tells me that these will work really well with what I've done so far. Opinions?
 
1gr8e320a said:
I've been very successful in replacing all the other drivers (tweeters, midranges and mid-bass drivers) with highend Aurum Cantus and Morel. I'm contemplating a woofer that has the following specs. *Impedance: 8 ohms *Re: 6.45 ohms *Frequency range: 25 - 1,000 Hz. I dont know but something tells me that these will work really well with what I've done so far. Opinions?
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If you've changed out all the other drivers already, then those aren't Kappa 8's any longer. I'd say you'd be better off trying to match the output characteristics of the other drivers you've selected rather than worrying about matching the K8's woofer specs.
 
When do you plan to replace the crossover and the cabinets? In 2011 and 2012, respectively? By then, no doubt they'll be "long in the tooth", too, right? Plus, it's always fun to take something amazing and make it awesome.
:D
 
Going to recap the crossovers next - cabinets are origninal and mint condition (no need to change). Making custom speaker grills that replicate the Sonus Faber and Krell black elastic band covers.
 
rroobbcc - I agree that the Kappa 8 and Kappa 9 are amazing in an original state. But as time moves on technology gets better and with a few extra dollars one can take something and make it even better. Nothing sad about that.
 
1gr8e320a said:
Going to recap the crossovers next - cabinets are origninal and mint condition (no need to change). Making custom speaker grills that replicate the Sonus Faber and Krell black elastic band covers.
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I think rather than just rebuilding the original crossovers, you should look into building new ones. The crossover points and resonant frequencies of the new drivers will be different, and the original crossovers might have things like notch filters to compensate which are no longer needed.

Be sure to match the woofer to the cabinet volume though - it's not simply a case of matching impedance, sensitivity and frequency range. Dropping in a random woofer which matches those three criteria won't be good. Download BassBox Pro and model your selected woofer in the cabinet volume of the Infinities and see how it responds. You might need to change porting or reduce volume.

Going active is a good way - saves a lot of brainache designing passive xovers.

Of course, if I were doing it, I'd keep them all original...they were designed very well.
 
Gents - here is what I have switched out so far.
Tweeters - Aurum Cantus G2Si
Midrange - Morel SCM 634
Mid-bass - Morel Supreme SCW 636

This is HARDLY SAD by any means. I started this thread to share what I am doing not to be villainized.
 
Today I purchased the Aurum Cantus AC300/75C2C woofers. So let's see here. Every driver I replaced meets and far exceeds the OLD & "long in the tooth" original Infinity drivers for a retail cost of 1087 for each speaker. You can rest assure they are far more superior in sound quality then the originals.
 
Please read my previous post. Exceeding the basic specifications (power, sensitivity, frequency range) of a woofer is not the whole story. It's like putting tractor tyres on your car because on paper, they give better grip.

The woofer needs to be matched to the cabinet. You need to plug in the T/S parameters of your new woofers into a box modelling program, along with the volume of the Infinity cabinets as it is very likely that you will need to retune them (change port size, decrease cabinet volume) to suit the new woofers. Otherwise, you're going to lose out on bass response.

Also read the bit in my post about the crossover. I'm not typing that again.

(oh, and be aware that like it or not, the resale value of the speakers will be destroyed if you change the drivers. Keep the old ones in case you want to sell them)
 
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