Javier_Huerta
Supporting Actor
- Joined
- Mar 9, 2002
- Messages
- 619
Hello all!
After giving *a lot* of thought to this, I finally decided to give DIY a double chance this winter season. Hey, a man has to keep himself busy thru the cold days!
Anyway, I'll be building an Adire EBS enclosure for my MartinLogans *and* a second sub for my Home Theater.
I can't be too picky about the drivers, since living in Mexico really limits my choices. I ordered the 250W plate amp and the Tempest from the States, but I'll buy the stuff for my second sub here in Mexico.
I'll be picking up a project Manuel de la Flor started . A twin 12" sub with Cerwin-Vega! drivers. You can take a look at the drivers here. The specs for the sub, taken from Manuel's post, are:
After giving *a lot* of thought to this, I finally decided to give DIY a double chance this winter season. Hey, a man has to keep himself busy thru the cold days!
Anyway, I'll be building an Adire EBS enclosure for my MartinLogans *and* a second sub for my Home Theater.
I can't be too picky about the drivers, since living in Mexico really limits my choices. I ordered the 250W plate amp and the Tempest from the States, but I'll buy the stuff for my second sub here in Mexico.
I'll be picking up a project Manuel de la Flor started . A twin 12" sub with Cerwin-Vega! drivers. You can take a look at the drivers here. The specs for the sub, taken from Manuel's post, are:
12" unit:
voice coil diameter : 2½
speaker displacement : 1.98 liters
FS: 22 Hz
Qts : 0.355
Qms : 12.880
qes : 0.365
Vas : 176.22 liters
Xmax 17 mm
Revc 3.6 ohms
I have designed a box using WinISD with the following specs:
- 320 liters
- Tuning frequency: 25 hz
- Vents: 2, 3" each, tuned to 25 Hz.
- 2 drivers.[/list=a]
I'm getting a very flat frequency response with a *very* slight dip (around -0.2 dB) centered at around 75 Hz and a 0.7 dB peak at 30 Hz, with -7 dB at 20 Hz. Supposedly, I'll have 118 dB SPL maximum power right until around 25 Hz, with 110 dB SPL at 20 dB.
I have a few questions, though.
- Am I missing something? Do I still have to check anything else before comitting?
- Is this true? Can such a cheap driver provide 118 dB SPL in a properly built and tuned enclosure?
- Does the driver seem to be any good?
- Any tips for extending the low end? I think the 20 dB response is way too low.
- Any other pitfalls you think I might fall into?[/list=a]
I'll thank you a lot for any help you can give me, since it all seems too good to be true. The drivers will cost me around $150 USD. I know it's no Tempest at the low end, but I'd guess that for home theater, the box I designed should be enough.
Thanks!!!!