Help me convert old speakers to actives

[AlmaAtaKZ]

Going up a steep learning curve of REW, Hypex Fiter Design, WinISD and many other things. Slowly getting better.

 

[Salt]

View attachment 416008

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What's that white box?

 

[AlmaAtaKZ]

Airport Express, for wireless input

 

[Salt]

Airport Express, for wireless input

Which way is the power supplied?

 

[AlmaAtaKZ]

Normal power cable. In the pic it is just not connected yet.

 

[Salt]

Normal power cable. In the pic it is just not connected yet.

So not derived from the plate amp, understand.

 

[AlmaAtaKZ]

Would have been nice!
I suppose it is possible just to tap into the AC power terminals inside the amp box. I will consider this in Step 2.

 

[AlmaAtaKZ]

Ok, this could be the reason for unusual, but under these conditions, correct SPL.
To linearize the tweeter you could insert (on top of lowpass) a shelf filter to attenuate up to 8 kHz and above let run free.

There seems to be two ways to do it:
- shelf to attenuate below 8k and run as is overall
- shelf to raise above 8k and attenuate overall
For no particular reason I did the latter. What will be the difference between the two methods above?

 

[AlmaAtaKZ]

Final selection of drivers:

Tweeter: https://sbacoustics.com/product/sb26stwgc-4-fabric/

Mid:
https://sbacoustics.com/product/4-sb12mnrx2-25-4-norex/

Woofers: pair of Dayton Epique 5.5in
https://www.daytonaudio.com/images/resources/295-102--epique-e150he-44-spec-sheet.pdf
Ordered these in US with a 60% saving vs UK.

 

[AlmaAtaKZ]

Working on box modification plans
A version of the new front panel:

 

[ckernel8]

@AlmaAtaKZ I just want to say I love this project so far and I will follow it.

 

[AlmaAtaKZ]

I am waiting for the delivery of the bass drivers tomorrow. The cabinet works are awaiting my return from holiday in Utah (also known as a drivers shopping trip).

 

[frangle]

Have you ordered tweeters? I have some very nice ones I might be able to donate to you (Scanspeak).

 

[AlmaAtaKZ]

Thank you for your very kind offer! I think I will stick with the SB ones as they have a waveguide.

 

[AlmaAtaKZ]

The little beasts are here.
4kg each

 

[ckernel8]

Man I'd love to take two of the 7" variety of these and put them in a "balanced force" configuration and make an awesome full range speaker with one of those DSP plate amps from Hypex.

 

[Salt]

Man I'd love to take two of the 7" variety of these and put them in a "balanced force" configuration and make an awesome full range speaker with one of those DSP plate amps from Hypex.

That's 4+4 Ohm drivers. A couple could be driven with coils in series and drivers parellel with nominal 4 Ohm to one amp, or, extrem snake oiled, one two-channel FA for each driver (or a 1.4 kW Purify and MiniDSP)

 

[AlmaAtaKZ]

Man I'd love to take two of the 7" variety of these and put them in a "balanced force" configuration and make an awesome full range speaker with one of those DSP plate amps from Hypex.

These 5.5 inch feel built like a tank and the suspension is very stiff. Looking at the coil the wire looks thick. The spider has narrowing wave towards the middle. I can’t wait to install and flex them with some music.
The rest of the drivers ordered and should be there when I arrive back from US with the Epiques. Cabinet rebuild is next. I need a solid baffle.

 

[AlmaAtaKZ]

My hands are itching to power these on.

 

[AlmaAtaKZ]

All the drivers have arrived. Planning the front panel layout and internals using life-size drawing.