CurtPalme.com Home Theater Forum

[bpb]

Hi Y'all,

got a question for you guys!

just finished building a subwoofer in at sealed enclosure . its got a 12 inch dvc(dual voice core)unit.

the subwoofer is being driven by both channels on a nakamichi pa-5s poweramp.

I want the subwoofer to work as an extension off my main speakers(and center), my speakers are small shelfspeakers, B&w matrix 805 which rolls off a bit to early(-6db at 48Hz). id like it to be optimized for music, but it also have to work for ht duty!


Now too the question!


it doesn't have an internal crossover/filter/equalizer yet, so i cant integrate it properly, and i bet its got some gain and dips.

should i use a crossover like the Behringer CX2310 Super-X Pro or should i equalize my way out of the problems with a behringer Feedback Destroyer Pro DSP1124P?

what does your experience tell you? is it best to use the crossover so i can cut how low my mains go and how high my sub joins the game, and integrate them with their natural rolloffs?

or should i equalize my sub and integrate it by just letting it join the game at my mains -3db point?


hope that my question made sense, i'm a complete newbe to the crossover/eq world!

best regards

panduro

[Wombat]

Can you just feed the Nak amp from the sub output of the surround receiver/processor? If you don't have a receiver/processor with bass management, then a separate processor like the CX2310, CX3400, or DCX2496 could work. However, you should give serious thought to getting a surround receiver. Some models have preamp outputs so you can still use separate amps.

Trying to EQ the bass is probably an exercise in futility since the response varies wildly from one spot to the next. Finding the best room location is a better idea. One technique: temporarily sit the subwoofer in your normal seating location, then crawl around the room and see where it sounds best. Then trade places with the sub.

[bpb]

I do have a surround amp, a holfi 3.5.1 but its a stereofile surround amp that doesnt have any bass management or room eq or so on.
i can feed the sub with both a lfe and a stereosub signal(that cuts to high),it but that dont help me when playing music!
I have thought about buying a new surround reciever/amp, but unless i go for the topend stuff which i CAN'T afford, it will be a step down in stereo:(.

i know, i like crawling around on the floor . but the subs position is set(gf), left of the couch near the back corner. i know i cant get a good even bassrespons at all the seats with that position, just need it to work in the sweetspot(my seat). thats why i thought about eq!

do you still think that using a bhr 2310 is my best option?

best regards

panduro

[Wombat]

There's active crossovers out there with better hifi credentials than the Behringers. I have reservations about adjustable crossovers, since pots don't track perfectly, and about the only practical way is to use VCAs inside a state-variable filter.

Until I gave into the Dark Side and bought a surround receiver, I used a homebuilt crossover in my setup: 4th order L-R using AD712 opamps, polypropylene caps matched to better than 1% on double-sided boards with ground plane, power supply using LM317/337 based on a Walt Jung circuit. Being DIY, I could also add features like summing in the LFE and Center channels since the processor didn't do bass management in DTS mode.

Marchand Electronics has kit crossovers, or you may have some locally available kits that are decent quality. Some car sound crossovers (like from Audiocontrol) may be good enough to consider.

On the other hand, the Behringer crossover may be perfectly adequate, and it offers a heck of a lot more features than you'll get spending the same $ at Marchand.

[bpb]

Hi Wombat,
thanks for giving my ? some attention.
but as im a complete newbee to crossovers and eq's you kind of lost me!
VCAs inside a state-variable filter? can u explain that too mee?
and again with: summing in the LFE and Center?


best regards

panduro