First off, this will be used for music with no HT duty. A pair of subwoofers will be matched with sealed 2-ways F3 ~ 73 Hz. I plan to cross the subwoofer 200~300 Hz. I can get a sealed enclosure flat pack for 1 cu-ft, 1.5 cu-ft, and 2 cu-ft.
2 cu-ft, Qtc =.71, F3 ~ 40Hz
1 cu-ft, Qtc =.8, F3 ~ 49 Hz: Has a slight .91 dB hump in the freq range of interest. This is the enclosure size recommended from PE.
I think that I will split the difference and go with the 1.5 cu-ft. which is in stock and ready for shipping. Would anyone care to comment on why this won't be an adequate choice?
Thanks
2 cu-ft, Qtc =.71, F3 ~ 40Hz
1 cu-ft, Qtc =.8, F3 ~ 49 Hz: Has a slight .91 dB hump in the freq range of interest. This is the enclosure size recommended from PE.
I think that I will split the difference and go with the 1.5 cu-ft. which is in stock and ready for shipping. Would anyone care to comment on why this won't be an adequate choice?
Thanks
Thanks for that link. I must have missed it or forgot about reading it on Rod Elliot's site.
I am planning on using a miniDSP 4 X 10 HD for this system.
I am planning on using a miniDSP 4 X 10 HD for this system.
Time to decide on what power amp to match with these.
Looking for a Class D Amp I came up with these possibilities:
JLE-800S
Connex CxD400
IRS2092 2x250
Wondon
I'm open to advice /suggestions.
Looking for a Class D Amp I came up with these possibilities:
JLE-800S
Connex CxD400
IRS2092 2x250
Wondon
I'm open to advice /suggestions.
The JLE part requires a separate floating 12VAC feed to provide power for the negative gate driver circuitry of the IRS2092. It needs to float so it can be referenced to the negative supply rail rather than ground. You can see that they do this in their little test setup with a 18650 battery and a boost converter. This is not ideal.
The other amps have this power supply built in as standard.
The wondon uses a dual mosfet plastic package for the output devices. One per channel. Nothing wrong with this but they have poorer thermal conductivity and lower maximum power dissipation than a design that uses two separate MOSFETs. For standard usage this isn't a concern but for a high power sub you may want to throw lots of power at I'd prefer a separate MOSFET design.
I cannot see what FETs the CxD400 uses.
Edit - it looks like it uses two separate MOSFETs rather than two in one common package.
The other amps have this power supply built in as standard.
The wondon uses a dual mosfet plastic package for the output devices. One per channel. Nothing wrong with this but they have poorer thermal conductivity and lower maximum power dissipation than a design that uses two separate MOSFETs. For standard usage this isn't a concern but for a high power sub you may want to throw lots of power at I'd prefer a separate MOSFET design.
I cannot see what FETs the CxD400 uses.
Edit - it looks like it uses two separate MOSFETs rather than two in one common package.
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