Do you think you need a subwoofer?

Hello Raul and others,

I understand that you advocate using stereo subs.

My question is this: Can you provide detailed instructions on how to hook up two subs in stereo?

For low level hookup - Do you send only 1 channel RCA cable to each sub?

Can you run REL subs with speakon connectors in stereo?

Hi Raul,

Thanks for your comments about how to hook up the 2 subs in stereo - it makes sense, just send one channel to each sub (either RCA, XLR, or high level).

However, your response did give me another question...

It appears as though you advocate using a crossover to take the low freq. information away from the main speakers (only have the sub handle low freq, as opposed to running both subs and speakers full range). Do you use the built-in crossover in the subs, and run your speaker cables from your subs to your main speakers? Or do you use some other crossover? If you use another external crossover, do you have examples of appopriate products? If the main speaker is a monitor that is -3db at 40hz, is it really necessary to use a crossover?

Thanks,

Todd

Thanks Raul,

I must have missed that part of the thread. Thanks! It does make sense.

You say:
"we use subwoofers not only for a better and extended low bass but for a better midrange/midbass too. So, the frecuency crossover will be over that 40Hz"

I am curious to find out what crossover frequency you use and recommend for different types of speakers? ie.
> Large floorstanding speaker -3db at 25hz
> Medium Size monitor speaker -3db at 40hz
> small monitor speaker -3db at 60hz

Just ballparks are fine.

Thanks! and I apologize if there was already iterated on the thread.

Todd

Raul,

No need to respond - I read your system notes and I see that you cross over at 80hz.

I think this is one of the most important threads on Audiogon for all to read and understand.

I have purchased a Velodyne DD15 (should arrive in about 4 weeks), and when funds allow I will try adding another for true stereo low freq. I'll experiment with crossing over my Dynaudio S1.4s ~80hz and see how that goes.

Questions: What is the difference between high-pass and low-pass? Also - on the DD series, there seems to be a graphic EQ as well as a parametric EQ. The parametric EQ has a Q value that can be modified. Is that parametric EQ something that I would want to fiddle with, or should I be able to accomplish everything with the more simple visual EQ? The velodyne documentation is a little light on describing what the purpose of the parametric EQ is relative to the visual EQ.

Thanks,

Todd

Dear Raul and others,

I ran into a thread on avtalk.co.uk specifically about using the high-pass filter in the Velodyne DD series:
http://www.avtalk.co.uk/forum/index.php?t=msg&th=11392&start=0&rid=0&SQ=0

In this thread, it is observed that the phase of the signal that is passed beyond the high pass filter is quite variable. There is a chart here where someone with a DD18 created to demonstrate this. The poster then goes on to recommend not using the high-pass filter on the Velodyne DD series. Raul and others - do you feel as though these phase variations are a major problem? Minor problem?

Thanks for sharing thoughts

Todd

cdc - By your reaction, I'm assuimg you had two high-end subs hooked up in true stereo mode with a high pass to your main speakers hooked up in your room? You found they didn't offer a suitable return on your investment?