Heresy/HIP Crossover/Driver Help

[karlsushi]

Hi folks.

 

Just joined the forum to hopefully tap into what appears to be some fabulous knowledge on this site. Hopefully you're o.k with that.

 

I've just acquired some Klipschy Heresys over here in the UK and and having them refurbished because the cabinets and crossovers are in a pretty poor state. The drivers and horns appear to be in decent enough condition thankfully.

 

The design seems to be a mish-mash of a classic Heresy and the Heresy HIP design. The cabinets were evidently HIP cabinets which were in the rounded-edged black PA style and they have a slot port at the base:

 

 

Yes, as I said, not great condition!!

 

The crossovers have obviously been tweaked, but as you can see, to a very poor standard:

 

 

The drivers are all as follows:

 

- K-77-M tweeter

- K-55-M Mid

- K-24-K Woofer

 

I had originally suspected these would need the HIE crossover network (being a HIP model), but I suspect that the woofer has been replaced by a standard Heresy driver based on some research suggesting that the woofer in the HIPs was a K42, not a K24.

 

I would be most grateful if anyone could assist or recommend the best crossover network to use with these speakers, bearing in mind the drivers used and the presence of the port?

 

Many thanks in advance for any advice/help.

[winglet]

For home use, I’d convert to the type E or E2 used in the heresy I.  You’re probably going to find that woofer boomy in a ported box tho..   Could always cover the port and see which you prefer.

 

I’d suggest finding a replacement pair of k42 if you can or a pair of Eminence delta pro 12a if not (possibly the same driver).  Celestion tf1225 also works VERY well in that ported box…. 
 

Head over to AK and ask and read up..

 

 

[karlsushi]

Many thanks for that.

 

Are you able to comment on how the E compares with the E2 network in terms of sonic signature?

[winglet]

Scratch my E2 suggestion… it was designed for the k53 mid.   
 

With that k55m and k77m, you may want to research modifying the E network with the AK3 tweeter network design.  If I remember right that was the best match for those drivers.  
 

@mboxler has some graphs on the other forum.  He’d be the one to ask

[karlsushi]

Looks like the Type E network is the one to go for then.

 

One other quick question. Is anyone aware of a reasonably-priced modern air core equivalent replacement for the multi-tap inductor used in the Type E network?

[winglet]

1 hour ago, karlsushi said:

Looks like the Type E network is the one to go for then.

 

One other quick question. Is anyone aware of a reasonably-priced modern air core equivalent replacement for the multi-tap inductor used in the Type E network?

The “multi tap inductor” inductor is the autoformer that klipsch uses to attenuate the drivers…. T2A in your case.  Each tap is a different level of attenuation.  You’ll need to rethink the entire network if you replace it as it attenuates both the mid and tweeter in an E network.

 

You’ll get better responses on the other forum.  Mods are not welcome here any more.

 

 

[Deang]

 

3 hours ago, karlsushi said:

Is anyone aware of a reasonably-priced modern air core equivalent replacement for the multi-tap inductor used in the Type E network?

No such thing.

Ever seen a 21mH air core?

 

If you push aside “reasonably priced”, you might be able to coax Dave Slagle of Impact Audio to custom wind it for you. 

[karlsushi]

Ok, that seems to answer that question pretty decisively.

 

Good job I can use the same T2A unit from my HIE crossovers and still use them in the E network then! Hopefully they don't need replacing.

 

Thanks again.

[Deang]

I stock OEM T2A’s. I only said air core versions weren’t available. 

[karlsushi]

Assuming it's because I'm new to the forum, but I can't seem to 'like' a post. So will just say thank you again 👍

 

Apologies for my lack of understanding on autoformers vs inductors. As you can probably guess, I'm not the one doing the work 🙂

Edited December 13, 2024 by karlsushi

[KT88]

You can and should use the T2A if you still have them. It is part of the good Klipsch sound. No urgency to use air coils here. On the contrary. I was more than happy when I found my original T2A for my Lascala in the basement. Air-core coils don't bring any real advantage when you take into account the efficiency of Klipsch loudspeakers. On the contrary, they can mess up the impedance of the whole xover.