1,5" wave guide shoot-out

[toddalin]

And where would one even look to find these drivers anymore? Maybe here...

https://orangecounty.craigslist.org/...667486353.html

[mefisto]

Hi Ian, all,

We appreciate you chiming in on your project. Detailed discussion of your project is best moved to a new thread.

I do not believe that I had mentioned my project in my responses herein, that had been sort-of disclosed here: https://www.audioheritage.org/vbulle...ent&highlight=

However, I understand the worry that the thread is moving away form the main topic; consequently, I will respond l the above-mentioned thread.

Kindest regards,

M

[Robh3606]

Hi Robh3606,

thank you for your reply.

As I am not as knowledgeable as the forum members (hence my search for a wave-guide/driver combination that is documented), can you explain the "I was pushing it a bit" because looking at your raw measurements, the 105 dB level is crossed as approximately 650 Hz, so why is the cross-over at 700 Hz "pushing it"?

Regarding the "best summation @ 700", are you talking about the pattern matching as mentioned by Ian?

I will read your thread.

Is there any other source for the M2 but Speaker Exchange?
Kindest regards,

M

Hello

Well if you look at the curve it's fairly linear until 700Hz where it quickly starts to roll off. When it starts to roll off the phase is changing as well. You are better off going for a 750-800 Hz. That said I am using odd order filters 3rd order acoustic woofer and 5th acoustic waveguide. I was not concerned with the exact crossover point. Just adjusted for a smooth summation.

If you look at the directivity plots on the M2 the directivity step change at crossover is actually at 700Hz not 800Hz. That said 50Hz one way or the other I don't see as a game changer as long as it sounds good and you don't have an obvious step in the response. The 4" drivers were crossed over as low as 400Hz in the early designs so they are robust. I would not recommend going that low.



Rob

[mefisto]

Hi Robh3606,

thank you for your reply.

Please note that I had moved any further discussion as per my post # 47.

Kindest regards,

M