myn's Tuba HT Build Thread

[myn]

My Behringer Feedback destroyer has a little -10 / +4db switch on the back which is handy as it sets the operating level of the device. I see on page 20 of the DCX2496 manual under "5. Audio Connections" it says:



I was using an RCA to male XLR from the receiver to the DCX2496 from MonoPrice.


I'm not sure how these MonoPrice cables are wired internally. I tried removing the sleeves but they do a good job guming up everything so you can't see anything. Even so, does the DCX2496 require the unbalanced XLR to be wired this way to detect the unbalanced signal?

Anyone know of a place that sells these cables wired in this fashion (pin 1 and 3 bridged)?

[Bill Fitzmaurice]

Anyone know of a place that sells these cables wired in this fashion (pin 1 and 3 bridged)?

Connecting pins 1 and 3 may work, or it may not. Sometimes you can run pins 2 and 3 and leave pin 1 disconnected. You're best off making your own cables to get what works best. And read this:

http://www.rane.com/note110.html

[myn]

Anyone know of a place that sells these cables wired in this fashion (pin 1 and 3 bridged)?

Connecting pins 1 and 3 may work, or it may not. Sometimes you can run pins 2 and 3 and leave pin 1 disconnected. You're best off making your own cables to get what works best. And read this:

http://www.rane.com/note110.html

Nice page. Bookmarked.

So it appears I'd want it wired like #17 ? Is this different than how Behringer is prescribing?

[Bill Fitzmaurice]

So it appears I'd want it wired like #17 ? Is this different than how Behringer is prescribing?

Maybe, and yes. Connecting consumer and pro gear is a Forrest Gump, you never know what you're going to get.

[AntonZ]

Anyone know of a place that sells these cables wired in this fashion (pin 1 and 3 bridged)?

Connecting pins 1 and 3 may work, or it may not. Sometimes you can run pins 2 and 3 and leave pin 1 disconnected. You're best off making your own cables to get what works best. And read this:

http://www.rane.com/note110.html

Again +1. My DEQ manual says for assymetrical use, connect pins 1 and 3 together. It will automagically do some internal switching to consumer level. Have a look in the DCX manual to see if it has a similar feature (probably mentioned under "Audio Connections").

Myn, do you happen to have a multimeter available? If not, I suggest you pick one up. They are available from a few dollars up and are a very useful tool to have around if you're in the speaker building and audio business, be it as a professional or amateur. You can check the connections in your cable with it.

[myn]

I'm sad to say there won't be any MAX SPL measurements posted by me. At least in the short term future.

After work I came home from work I started playing with the THT, demoing some music and some movies. I had it up a bit higher than I normally do. SPL meter was peaking at a little over 122db from my main seating. Not 15 mins after I turned everything off did I get a knock on the door.. Guess who. The Police.

He was really cool about it. I explained how I had been working on it all summer and I was just "Testing it out". He just told me to keep it down and left. I'm kinda bummed about it because this visit sets a precedence. It means I have to watch the volume each and every time I watch a movie now.

[maxmercy]

JEEEEEEEZZZUS......

122dB at the LISTENING POSITION???

I hope you weren't subjecting yourself to that for very long without hearing protection...Dolby Reference calls for 121dBs only when all channels are playing a loud low freq peak at once....

But seriously, that sucks about your neighbors...I must have deaf ones by comparison, as I can't tell you how many times they have heard movies in the wee hours of the morning at 10dB below reference...and nary a complaint....

Maybe on a Saturday afternoon or Sunday morning...


JSS

[paul_ulrix]

it's loud yes, but are those low basses really bad for your hearing ? the thing with horns is that they sound so clear you don't really notice it's very loud, except lot's of stuff in the house starts to rattle

[thijs666]

it's loud yes, but are those low basses really bad for your hearing ?

That's what I've been wondering about for a long time. Looking at Fletcher-Munson curves...



.... 120dB @ 30 Hz equals 100dB @ 1 kHz, in terms of loudness. But does it harm your ears as much as 120dB @ 1 kHz???? . Honestly, I very much doubt that .

[Radian]

t's loud yes, but are those low basses really bad for your hearing ?

YES

Tinnitus doesn't care what frequency damages your hearing. Anything higher than 88 db relative "(for some folks even less) in the curves (like 120 @ 20 hz) will do in your cochlea just fine. Gotta love my new "ring-tone."

Possible sources of low-frequency tinnitus:

-Trimming the fuel control of a GE F110 at the test cell
-Any Depeche Mode concert
-My neighbor firing up his hog on a brisk morning
-Titan IV launch
-Fireworks
-Efficient Subwoofers
-Whacking a stethoscope while your wearing it

[Rickisan]

One definite cause of Tinnitus...
at least in my case...
is playing drums in Rock bands 5 and 6 nights a week...
year in and year out...
the entire decade of the '70's...

[AntonZ]

Whenever I'm near the drums on stage or durig rehearsal with a loud drummer, it seems to me it's the cymbals that hurt my ears.

[Rickisan]

Now that you mention it the "Ringing" I experience has a fundamental frequency quite similar to a crash cymbal. Ah well I've learned to live with it... the ringing isn't so bad it's not being able to understand conversations in noisy places that's a pain. Like in a bar... how can you talk up a Bird if you can't understand her???

[myn]

[== 11/6/2009 ==]

I just went down to the media room and took a quick measurement from one of the listening positions with EQ disabled. I know indoor measurements are just about useless given the number of factors that can affect the sound but it's a start.

As mentioned previously it's currently sitting in an unideal location for a horn, next to my LLT and isn't corner loaded yet. Once I move it into it's final resting spot (Corner) I'll take some more detailed measurements along with waterfalls and distortion measurements.

I did find it interesting that at different base SPL levels of measurement the response curve changed a bit for each. Perhaps a unique characteristic of horns?

Even this quick measurement confirms what my ears heard and what my body felt. The THT goes alot deeper that my LLT.

[Tom Smit]

Please excuse my ignorance but how can, or did you really, measure down to 2 hz? This is a first for me!