Check my thinking

[djn]

I'm planning on building two more subs for my new room. I have two old Altec cabs I will brace. They are 4.5 cu ft. I'm thinking of using these components. Your thoughts?


Behringer NU3000DSP iNUKE 3000 Watt Power Amplifier with DSP

Dayton Audio UM12-22 12" Ultimax DVC Subwoofer 2 ohms Per Coil

 

[Brian Steele]

I would consider this one instead:

Dayton Audio RSS315HF-4 12" Reference HF Subwoofer 4 Ohm

Box size is a perfect match, if you're venting the box.

The UM12 has a Qts of 0.6. That's a bit high for a vented alignment, and recommended sealed alignment for it calls for a box size of 2.8 cu.ft.

Specs-wise the Behringer amp looks fine. I seem to have had bad luck with the NU3000DSP though. Both that I purchased ended up failing within a year or two. Not something you want to happen when shipping the amp for repair costs half as much as getting a new one.

 

[Scott L]

Another consideration

If it were me, I would choose the Eminence Lab 12.

Eminence LAB 12 Professional 12" Sub-woofer Speaker

Eminence LAB 12 Professional 12" Subwoofer Speaker

 

[GM]

Assuming sealed, then once braced it's a near enough T/S max flat alignment assuming published specs are reasonably accurate, so what's not to like if this is your performance goal?

GM

 

[HumbleDeer]

I have an iNuke 3000DSP model and it's been working fine ever since I got it. All day long.

You must have gotten unlucky with two factory faulty models, Brian. Condolences.

I run a single 315HFA-8 on the iNuke myself. headroom for a second one.

 

[djn]

The Lab 12 seems like does not fit my cabs. I've mot run the numbers just looked at PE posted for that driver.

 

[djn]

How high of the floor should subs be up off the ground?

 

[straight8s]

How high of the floor should subs be up off the ground?

The floor will load the sub and have similar effects as corner loading. Distance from floor/walls is mostly dependent on room, whatever sounds best in your set up. Too close may create excessive reverb then bass tends to start sounding sloppy.

That Eminence is a great looking sub.

Why not build complete cabs? You may rattle those antique altec cabs apart. Ive done similar only to find a rattle that I could not resolve a box of screws later in the long run it was more trouble then it was worth.

 

[GM]

How high of the floor should subs be up off the ground?

For what?

For max loading, setting on it; otherwise, rooms are 3D, so at an odd harmonic of its vertical modes, same as when placing them along a wall, etc., as a starting point; or are you referring to bottom firing, assuming the driver meets the sag limitation?

GM