Hooking up subwoofer in 2CH system..

woodsyi · « **Reply #20 on:** 3 Mar 2006, 04:20 pm »

Doug,

My ribbons handle the midrange and treble. There is a passive filter network connected to a set of binding posts that handles the ribbons including the highpass on the low end. So I can send a full signal directly from my pre to the ribbons. Knowing the slope and pole for this, I actively biamp the woofers: woofers on the mains doing 80 to 280 and subs handling anything below 80. I am not using an EQ on the woofers right now but you still need to check the frequency response to dial in the gain on each amp and what filter pole frequency works for you in your room. In my case there is a mode around 40 that favors staggering the pole frequency. I may put in a eq later if some more traps that are coming doesn't ameliorate the room to my satisfaction. Even though Marchand is a good product, I am glad that the sensitivity and gain on my amps with adjustable potentiometer on my main speakers allow me to match the driver output levels without running the ribbons through the whole active x-over circuitry.

Doug_B · « **Reply #21 on:** 3 Mar 2006, 04:54 pm »

Quote from: woodsyi

but you still need to check the frequency response to dial in the gain on each amp and what filter pole frequency works for you in your room.

OK. Got it.

Thanks.

Doug

Harry P · « **Reply #22 on:** 4 Mar 2006, 03:27 pm »

If you're looking for great musical subs you definitely want to investigate ACI. I own a pair of Force subs. I've heard their Titan a number of times. I've been involved in direct comparisons wih a number of other subs including the RELs. One of my next purchases will be an ACI Maestro

konut · « **Reply #23 on:** 7 Mar 2006, 02:24 pm »

Quote from: Destroyer of Smiles.

Quote from: konut
I'm glad DOS mentioned Marchand. I just ordered 2-XM46 modules. These are passive line level filters. I ordered 24db per octave high pass filters at 70hz. I am going to use these with one of the products a Circle manufacturer makes. If you click on the Circles link on the top right of the page you get a page with all the manufacturers represented here with the URLs. Click the AV123 URL. Go to their products tab. Click subwoofers and find the UFW-12. Thats what I own. The UFW-12 comes with a 5 band digital ...

What driver does it use?

An extensive review of the UFW-12 has just been posted on by Ed Mullen on Secrets http://www.hometheaterhifi.com/volume_13_1/onix-ufw-12-subwoofer-3-2006-part-1.html Page 3 of the review has a picture of the driver in question. Maybe someone can deduce the manufacturer from that photo.

mcgsxr · « **Reply #24 on:** 7 Mar 2006, 02:50 pm »

I am sure there are others with sharper eyes, but that basket structure certainly reminds me of certain Adire subs, or the Dayton IB - tasty looking piece, regardless of who made it!

Folsom · « **Reply #25 on:** 7 Mar 2006, 03:26 pm »

The basket is pretty standard spider style, there are a LOT of drivers that use it, mostly in car audio. The magnets also look like ones I have seen more than once, nothing unique. However the cone, and I venture to say motor, are custom I bet. They do not particularly look like any I can recall.

seraph321 · « **Reply #26 on:** 30 Mar 2006, 11:29 pm »

My system includes a pair of Gallo Reference3s with the SA bass amp driving their second voice coils. Although I haven't directly measured it, the system easily extends to somewhere around 20-25hz. I like this because it's in full stereo and the bass response is very tight.

Here's the interesting part: I'm going to be adding a subwoofer for home theater that will extend to 16hz, and possibly a little lower. I've been looking at the SVS 16-46 PC-plus. This sub can give you usable ouput even down to 12hz. I would really like to have that available while listening to music, but I still want my mains to handle everything above 25hz or so.

It looks like the Marchand crossovers might work for this, but they are quite expensive. I'm just wondering if anyone has tried extending the range of "full-range" speakers like this. Is it even worth trying it? It seems to me it could be really nice to have that extra overhead for when it's really called for.

Folsom · « **Reply #27 on:** 31 Mar 2006, 10:05 am »

You need bass below 20hz (22hz -3db on Gallos)? Uhhh you know I doubt that there are to many CDs or DVDs that go below it.... Hell some equipment is not even rated to handle under it I think?

Well I guess if you like pipe organ music.....

Perhaps you should turn the gain up a little on the SA amplifier?

I think excessive bass beyond what was originally recorded is a butchery as much as any thing else degrading. Perhaps you are just one of those bass hungry people? Also what type of room treatment do you have done? Perhaps there is some thing that needs attention in the room.

seraph321 · « **Reply #28 on:** 31 Mar 2006, 11:56 am »

first, I don't like excessive bass, I just want as much as was intended. I agree there isn't much out there that goes below 20hz. but I DO listen to a fair amount of electroic music that can contain some pretty low stuff.

to be honest though, its more of the science in it that made me ask. if I have a sub that can go to 12hz, and probably is a lot stronger in the 20-28hz range than the gallos (im not sure they are really flat to that range, and I'm looking into room treatments), it seems there's a gap there that could be filled. having a crossover in there could act as a subsonic filter for the gallos, but instead of throwing away those signals they could be directed to the sub.

it was just a thought though.

woodsyi · « **Reply #29 on:** 31 Mar 2006, 01:12 pm »

When you "listen" to sound from 10 to 20 Hz, you won't hear anything unless you turn it up. At least that's the case for me. I can measure it but I can't hear it at 80 dB. I can, however, hear loose thing rattling. I start to hear the rumble when I turn up beyond 100 dB but how long can one listen at that level?