New build with large format CD

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#41
Vermond said:
Do you have other constraints, like maximum enclosure volume? Closed/Bassreflex? And what -3dB frequency for the low end?

I am looking for maybe something similar, and was checking some 15inch drivers to see what would be a reasonable f3 for a 70L BR. The B&C 15NBX100 seems to do quite a good job with 70L/45Hz, see below.

View attachment 1337371

According to Humble Homemade Hifi, mentioned in the PDF of the Calpamos speaker, a woofer/midwoofer for hifi use and played at low volume the following is important:

  • Low mechanical losses
  • Low moving mass
  • Low resonance frequency

He also uses the acceleration factor BL/mms, to show that the speaker he choses (Faital Pro 15PR400) has the highest factor of the three considered Faital Pro speakers even though it has the lowest BL value.

HHH Calpamos speaker:

View attachment 1337372

B&C 15NBX100:

  • Mms: 151g
  • BL: 25
  • Fs: 36Hz
  • BL/Mms: 0.166

Faital Pro 15PR400:

  • Mms: 85.2
  • BL: 16.7
  • Fs: 35Hz
  • BL/Mms: 0.196

I do not have experience with these woofers, but trying to find some guidelines as well for selecting a proper 15" woofer for a 2-way.
Click to expand...
I think the 15pr400 has too light a cone Suggesting it’s too fragile. I’m not sure if it’s just ocd.
 
#43
I’m still selling old parts to finance the project. I could just build it but my house looks like an audio showroom.
I am also having an issue deciding on a waveguide for the radian 745bePB. I’m thinking about the speaker being modular to allow for a bass cabinet and a separate cabinet for the waveguide and CD so I can temporarily use a SEOS 15 which I currently have and then sell that to change the waveguide. The SEOS will use a BMS 4550 which I also have already.
 
#46
B&C 15TBX100

This 15 was used in the original GedLee summa.
I'm open to the B&C NBX100 which is essentially the same driver with a neo motor, but Parts Express doesn't carry it making the TBX version much cheaper with free shipping in addition to the price listed as $50 cheaper to begin with.

Both have the motor power and cone strength for the mid bass I'm looking for.
There are some size constraints which is why an 18 wasn't chosen.
 
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