Any experience with the Audax HM170G8, HM170Z18 or HM170C0?

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#21
No, I was in Lyon and Bezier. I had one of the best meals of my life last Saturday. I'm not impressed with French cars, but you folks sure do know how to cook!

Unless you have a driver whose frequency response is perfectly flat for several octaves beyond the crossover point, it's usually futile to even try a 6 dB crossover. I don't tend to use them much except in things like 6 or 7 way systems. Bad problems with lobing, power handling, distortion, and hitting target frequency responses.
 
#22
SY said:
No, I was in Lyon and Bezier. I had one of the best meals of my life last Saturday. I'm not impressed with French cars, but you folks sure do know how to cook!

Unless you have a driver whose frequency response is perfectly flat for several octaves beyond the crossover point, it's usually futile to even try a 6 dB crossover. I don't tend to use them much except in things like 6 or 7 way systems. Bad problems with lobing, power handling, distortion, and hitting target frequency responses.
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Bezier is nice, beautifull castle on the top of the city 🙂
Don't criticize our cars, the new renault's design is the only think you're allowed to laugh at 😉

What was the good meal you ate? I'm becoming hungry....


For the crossover, sure that 6dB has also disadvantages, if it hadn't, everyone would use it. Little power handling is no problem for me. Can you explain me why it has more distorsion?
I'l like to know more about lobing, I haven't found much infos about this, can you explain me what it is, or do you have a good url? 🙂

thanks
Alex
 
#23
Bric, go to Maison Borie in Lyon's Gerland district. Tell the maitre d' (a beautiful woman named Laurence) that you heard about it from some crazy American friend of theirs that makes corks. And don't order from the menu, just put yourself in the chef's hands. A memorable experience, and I say that as someone whose occupation has made it fortunately possible to travel a lot and eat at some pretty fine establishments.

Lobing is a complicated issue best made clear with drawings. It's the result of the complex (in a mathematical sense!) interactions of radiators separated in space. There's an elementary treatment in the infamous Loudspeaker Design Cookbook. Additionally, you can model lobing using some of the free software from the FRD consortium.

Now, as to distortion, it's normally a result of lack of sufficient low frequency rolloff. If a tweeter, for example, is rolled off too slowly, it will have to handle more low frequency energy. That means more excursion. That means more distortion and lower power handling.
 
#28
Hello Bricolo

If budget is the limit, go for Z18 or G8 + A16. I think its an unbeatable combination for the money. Use LR 24 for A16, it really helps. Use very thick aircores in the (whatever you end up) TW circuit anyway, it helps with IMD.
Remember that A16 which is a great tweeter sounds broken compared to A20...maybe you can wait a little and save for the new HF unit. It takes 120W also and its far less prone to lower frequency intake induced distortion with lesser slopes too.

Good luck

Salas
 
#31
Bricolo

As you have mentioned the seas 27tffc (or H881 as it is also known). Look at this design where it is used with the HM170Z18.
IPL A2 Mk4
The previous version of this speaker used the Audax tweeter, but when that was discontinued it was changed to the seas. The designer claims this was an improvement, I can't confirm this as I never heard that Audax tweeter, but I have built the current version of this speaker, and it sounds good to me! If you don't fancy designing a x-o then I can recommend this design. Though perhaps you are looking forward to more of a challenge?
The seas tweeter has a very good reputation generally for robustness and sound quallty for the price, though it is more expensive than the Audax was, which was legendary for value.
Ian
 
#33
Sorry, the Audax TW025m1 was used, not the m0. I don't know how different these 2 units are. The UK magazine HiFiWorld developed a number of kits using both these tweeters (like the KLS 9 I referred you to earlier). I saw a theoretical design by the then editor which used the HM170Z0 with 1mH matched to the TW0m25m1 with just a 7.5uF cap and a 2.2/22 Ohm L-pad as the mid and high of a large open baffle using 2 PR330 paper drivers for bass. I don't know if anyone ever built it, but the designer, Dominic Baker, went on to greater things. He designed the new JMLab Grand(e) Utopia (sorry can't remember if that has 'e' on Grand). If you can get either of these tweeters they are probably worth it. There is also a cheaper veresion of the seas without the rear chamber which has to be used at higher x-o freq. IPL uses it in another kit matched to one of his own drivers.
Ian
 
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