SEAS 2way

[tpsorin]

As i said, unfortunately the SEAS is hard to get. At least the models that I asked for.

I can get Dayton RS series.
I also can get Beyma studio series and maybe Monacor (also is not in stock but can order in 2-3weeks)

My variants now are:
2way Dayton with 2xRS180S + RS28S
or
3way Beyma with 8BR40S (sealed-50l) + 5MP60N + T2010 (or RS28S)

Any opinion about Beyma and Dayton?

Thanks

 

[Ap]

If you are thinking about Dayton RS then check out the projects at PartsExpress, otherwise the Seas are very easy to work with to get good results.
I wouldnt go for the Beyma 3 way, nothing against them (they are very good quality) just the complexity of the system is much harder.
If you are after a wide sweet spot, then I would go for drivers with a lot of overlaop in their usuable range, ie a 6.5" good up to 4k, tweeter down to 1k, and cross at 2-2.5k, that way you will avoid beaming/lobing issues.
Your original choice of drivers is Ok, but the Seas 27tffc has an Fs of 900hz & recommended range from 2k, the 27tdfc has ferrofluid which will help in the crossover range so I would go for that one, the CA18rly is Ok but perhaps the CA18RNX with its larger magnet will give you a bit more bass.
Worth taking a look at www.zaphaudio.com for some useful info.
Andrew.

 

[sreten]

My variants now are:
2way Dayton with 2xRS180S + RS28S

Hi, http://www.rjbaudio.com/RS180MTM/rs180-rs28-mtm.html , /sreten.

 

[tpsorin]

I wouldnt go for the Beyma 3 way, nothing against them (they are very good quality) just the complexity of the system is much harder.
If you are after a wide sweet spot, then I would go for drivers with a lot of overlaop in their usuable range, ie a 6.5" good up to 4k, tweeter down to 1k, and cross at 2-2.5k, that way you will avoid beaming/lobing issues.

Andrew.

OK. I am also thinking more about Beyma.
What tweeter do you recommend? Beyma or Dayton? Also Seas 27TDC is available.

Is there any advantage in using 2 Mid drivers instead of one? MMT arrangement.

 

[tpsorin]

Just ordered:
2x Beyma 8BR40
2x Beyma 5MP60N
2x Seas 27TDC

 

[tpsorin]

This is first variant I will try.
There will be a passive crossover between tweeter and mid. No Low pass crossover. The bass will have active high pass crossover.
For start I will use 4x LM3886 amplifiers (design of Mauro Penasa);

Any comments are welcomed.

Thanks!

 

[Ap]

No low pass xover on the mid will result in beaming/lobing issues, I would strongly suggest using some sort of filter, even if it is just a shelving filter to help with baffle step (ie inductor/resistor paralleled then series connected to the woofer).
Andrew.

 

[tpsorin]

No low pass xover on the mid will result in beaming/lobing issues, I would strongly suggest using some sort of filter, even if it is just a shelving filter to help with baffle step (ie inductor/resistor paralleled then series connected to the woofer).
Andrew.

Sorry! I was thinking of something and typing something else.
Rephrase: "No high pass crossover for mids"

Between mid and tweeter, there will be a normal passive filter. There are already some 2way projects with this drivers. But I will design another filter. There is more fun than just copying

It will be something like a 2way + (sub)woofer.

 

[Ap]

That makes more sense!
Andrew.

 

[tpsorin]

I just received the drivers.
Now I'm running the 5MP60N as fullrange in a sealed ~7l box. It is quite good. With BSC and room gain is flat to ~80Hz. It goes up to 5-6kHz. I think this one will be quite easy to cross.
But before that, I will try it in a small TL and open baffle to see how it performs. It has about the same parameters as drivers used in Ariel. Maybe it works good in TL.