listen to your SDA's without the interconnect SDA cable?

danger boy

you ever listen to your SDA's without the SDA intereconnect cable?

second to the last option should read. you are a risk taker and now want to use your SDA"s without the cable.

danger boy

cast your vote not.. make it count.

avguytx

Ok....I'm in.

John in MA

I use my cable most of the time, but certain music sounds better without the effect. At least in a small listening room.

I think folks sometimes don't realize you're not losing any "positive" speaker driving when that thing's disconnected.

danger boy

John in MA wrote: »

I use my cable most of the time, but certain music sounds better without the effect. At least in a small listening room.

I think folks sometimes don't realize you're not losing any "positive" speaker driving when that thing's disconnected.

Thank you.. i think you understand.. that some times SDA's sound just great without the SDA cable. Some music is over exagerated in it's soundstage using the SDA interconnect.

dorokusai

If you don't like enjoy SDA, awesome but if it sounds better to you without the cable....you should try listening to better loudspeakers. Save me the piss and moan about what you've heard in the interim, respectfully....but maybe it's time to move on, its ok.....its ok, you're not alone little soldier.

nms

The only stuff I like better without the cable is George Winston on piano, because one mic was used for the low notes and one for the high notes. With the SDAs, this makes the piano unnaturally wide and non-directional. With the SDA cable un-plugged the soundstage solidifies towards the center.

But for everything else I use the cable.

danger boy

it's not a case of it sounds better this way or that way... some music doesn't transfer well under the SDA effect of the speakers.

just saying that the SDA's sound good and are decent enough speakers without the cable.

that's all. it's not worth arguing over... there is no right or wrong answer to it.

dorokusai

danger boy wrote: »

it's not a case of it sounds better this way or that way... some music doesn't transfer well under the SDA effect of the speakers.

Really? No kidding? Man, I've wasted alot of man hours.

danger boy

dorokusai wrote: »

Really? No kidding? Man, I've wasted alot of man hours.

don't you wish you could get all those hour's back now?

dorokusai

Yes, but I slept at a Holiday Inn Express last night so aside from the bedbug problem, I feel fine.

nadams

John in MA wrote: »

I use my cable most of the time, but certain music sounds better without the effect. At least in a small listening room.

I think folks sometimes don't realize you're not losing any "positive" speaker driving when that thing's disconnected.

You're telling me that with the interconnect unplugged, I don't lose half the active drivers?

That's the way I've always understood it. Inside drivers are stereo, outside drivers are SDA.

dorokusai

You do, it's the SDA vs Stereo that they're referring to nadams.

Hijack - Where are you on this subwoofer demo? Check the thread and update over there please.

F1nut

John in MA wrote: »

I think folks sometimes don't realize you're not losing any "positive" speaker driving when that thing's disconnected.

You're going to have to explain that one.

shadowofnight

John in MA wrote: »

I think folks sometimes don't realize you're not losing any "positive" speaker driving when that thing's disconnected.

Not according to the schematics....

John in MA

It's not quite that simple. The outer SDA drivers, above 200 Hz, are "active" but they don't produce the sound you're actually trying to listen to. They play a quiet mirror image of the other channel to cancel it out in that ear and supposedly present a more natural image of the soundstage. In most of the frequency range you're only actively hearing the inner stereo drivers.

Below 200 Hz the SDA drivers function in concert with the stereo drivers, instead of mirroring.

By unplugging the SDA cable you only lose the canellation effect. They still work below 200Hz because they're wired in parallel (through big inductors) to the stereo drivers.

The sound you're normally aware of hearing will still be there. The soundstage will probably be a little more compressed. As a "straight" speaker, a 1.2TL (for example) is essentially a 5-way (?? not sure, I don't recall how many steps the tweeter array has) with four drivers crossed below 200Hz, four drivers crossed below 2000Hz, and the multi-way tweeter line. The only difference in SDA operation is that the four outer drivers play a mirror from 200-2000Hz.

dorokusai

Is that based on visual confirmation of the non-SDA drivers, upon stereo input? You do realize that they are sealed enclosures right? I'm positive you hear sound "from" those drivers but it's residual and from the adjacent driver.

John in MA

No, it's based on looking at the schematic. Take the interconnect out of the equation and the SDA drivers are paralled to the main inputs just like the stereo drivers, only through an additional inductor. The fact that they work in stereo below 200Hz is in Polk's description somewhere, too.

I should note that I'm only talking about the big SRS models, I've never bothed to research the smaller models since I don't own any.

shadowofnight

On my SRS schematics, there is a 16mH coil that ties to the sda arrays ground ( Well negative...shows ground icon on schematics ) ...I hadnt noticed that before.

So basically I should be able to pull my radiator ( Un-coupling all the drivers by internal air volume ) and apply a 1.5v d cell to the terminals and watch all 8 drivers move in unison forward and reverse polarity and watch them move back. Gonna also try one of my test cd's that has the drivers moving so slowly ( 5Hz ) that you can SEE if they are in phase and excursing the same amount.

F1nut

I don't believe that is correct. The SDA drivers only work between 150Hz and 2000Hz. They do not reproduce a signal out of that range.

John in MA

My original 1989 manual for my 1.2s lists the second low-pass crossover point as being for all drivers, although it says 150Hz so I might have picked up the 200 number from original SRS article in Stereo Review.

Some of the smaller/older ones might not work this way. I looked at a schematic for something in the 1 series a while back that didn't have as much wiring.

treitz3

Somebody here is losing a little credibility. :eek:

shadowofnight

treitz3 wrote: »

Somebody here is losing a little credibility. :eek:

Just because they quoted Stereo Review

shadowofnight

Spent the last hour and a half testing my sda's ( SRS...2.3...CRS+ ) All sda 6.5" drivers work identical ( In phase and with similar acoustical/power output ) to the stereo drivers up to AROUND 150Hz.

This is also supported by the schematics ( Never really looked at them in depth before ) as well as the factory manuals.

My 2.3's came with an awesome extra manual describing what drivers were active at what particular frequency , as well as describing the SDA effect in greater detail then I had ever seen before. This extra manual also has PICTURES as well...so I took some shots . It explains the SDA effect is best engineered for between 800Hz and 2KHz. Here are some of the pics....

shadowofnight

High freq.....

shadowofnight

2.3 crossover description

F1nut

I looked thru all the SDA material I have and didn't find anything that really addressed the issue, except that the SDA cut off is at 150Hz, so I've edited my previous post to reflect that. I'd like to hear what Matt Polk has to say about it.

heiney9

So the cable is detachable .......................................



























H9

nms

I back John up, below 150 or 200 Hz ( I think it's 200) the SDA drivers work with the stereo drivers to produce the bass. I've read it somewhere...

heiney9

Let's keep in mind the generation and model have a lot to do with how the "dimensional" drivers are incorporated into the whole mix.

H9

Marty913

So the cable is detachable ?

Too funny.

(it is but not advised - the Interconnect Police are always watching)