* Offical Velodyne Support Thread * - Page 264

Originally Posted by Bert003

Does anybody know at which phantom voltage the DD-12's microphone operates? I mostly can't see any eq-curve with the sweep tones anymore. Only if I put the mic. 1" away from the woofer at subwoofer volume >30, I can see the curve.
But at normal listening distance there is no eq-curve at all. If I measure the DC Voltage with a voltmeter between 2 pins in the XLR-plug it
shows 11,7V. Is this normal? I tried another Velodyne microphone so it isn't the microphone or cable.

Also, when the volume level indicator is set at 30 without input signal, the woofer is a bit nervous, I can feel it moves as if there is some internal noise which gets higher with the volume. At volume 30 it is also a bit hearable. No real problem because the normal operating volume is 5-10 and then you can't hear it. Is there any circuit in the sub to eliminate noise from the mains outlet? Should external filters be used when the 220V has to be cleaned?

I am a new owner of this used woofer.

Originally Posted by CheeLoo

Last week I received my new speakers, including an SPL800 Ultra. The third day I used the sub it started making pink noise on top of the signal. It was always there, slightly louder than the fan on my projector. I tried muting the sub and unplugging the signal cable, but the noise was still there. It did stop when I turned off the sub but it was still there when I turned it on. Entering the reset code didn't help. The next day when I was about to pack it up to bring it back to the store I realized I should try the main power switch on the back. This did help and it has been working for a week.

Is this something to be concerned about? I don't want it to reappear with a vengeance the day the warranty runs out.

By the way, can the supplied calibration microphone be used with a PC to do room measurements?

Originally Posted by catdog2

Hello
The EQ curve should appear once you enter setup (1 2 3 4 5.) Can you hear the sweep tones? In the upper right corner of the screen do you see "MIC?" If so verify that the cable is plugged into the bottom XLR input. Also try increasing the volume to the signal.
Yes, there is circuitry in the DD amp to prevent AC noise. With nothing connected to the DD12 but AC power can the noise be heard from over 5ft. away? If not, then the unit is working correctly. Yes, external filiters should be used when the 220V needs to be cleaned.

Originally Posted by Bert003

I can hear the sweep tones, but I can't see it on the display. Only if put the mic. 1" away from the woofer cone with woofer volume at 60 I see the curve. Which is very loud. Much louder that the 70 dB which the screen indicates.
But I can't set the volume loud enough so that the curve is shown on the screen when using the sweep tones through my amplifier on 10 foot normal listening distance. There is no MIC indication in the screen. Not in the main screen not in the curve or settings screen. When I blow close in the microphone I see a reaction in the curve screen, so it looks like if the microphone signal is too weak. And therefore I asked if 11,7V phantom is enough. In the specs of the Behringer ECM8000 mic. I see it operates from 15-48V, so it might be a problem there.

About the noise.
As I wrote the woofer moves a bit nervous and sometimes I hear louder plops also. Increases with the volume as set on the woofer. After that I took another power cable with coils at each side, and I also took a Schurter Euro Mains entrance with built-in filter and put it before the power in connector. After that the woofer gives much less noise. And no loud plopping sounds anymore, but without input signal, at volume 60, the woofer still moves 2-3 millimeters back and forward with noise. It is barely hearable at 5 feet. Don't know if this is normal, because at normal volumes I can't hear it at all. But if the woofer should be dead quiet and without any movement of the cone due noise it might indicate a problem?

Originally Posted by catdog2

Hello
Which verison of the software does your DD12 have? If you have verison 2.0 or higher place your unit into the self EQ mode 3 2 1 The self EQ mode will set the volume/voltage level so that the mic will display the EQ curve as it EQ the room.

If the noise is not audible from 5ft away at normal listening level it is working correctly. Volume level at 60 (which is way to high) the noise is the amp hum the movement is the servo reacting to the hum. To test the woofer calibration point the remote at DD12 and press 6 7

Originally Posted by Bert003

The software is version 2.2.2.
With self EQ, no curve is shown with mic. at listening position.
With self EQ, the curve is shown with mic. at 1" away form the woofer cone.

I did 6 7, the test started and some counter stopped ACCGAINH 55, then the unit reboots. No error message or something.

The noise, rumble can be heard good at volume 40 at 8ft., and a little at volume 10. Apart from the noise I hear a few loud plopping sounds every few minutes.

Can you give me an idea what a replacement amp will cost for a DD-12 when obtained from Velodyne? The unit is from 2005.

Originally Posted by Bert003

Hello Pete,

PM received and answered, thanks.

A question about the large rush-in current when powering on the DD-12. It causes the subwoofer to blow out the fuse in my house. I heard that this is not an error, and all DD's do this in certain situations.

There are different electronic solutions to prevent this. The easiest is to put 1 or 2 NTC resistors in series with the power leads. Is this a well known solution for the DD-12 or is it a problem if say 4.7 Ohm is put in series with the power input?

Another option would be to put a few resistor's in series and bridge them after a few seconds with a relay. Then you have a 2 stage power on. This is technical the best solution because nothing is put in series with the power leads if the subwoofer is working.

And yes, I know I can put the DD-12 in standby mode, but I won't :-) The large rush in current is a bit destructive too for some components in the power supply in the long term.

All this can be done external ofcoarse to keep the DD itself original.

Originally Posted by Bert003

On a DD-12, how do I use the external trigger input? I have read the manual, but I can't find where the input is for the trigger signal. I heard it is on de RS232 port, but I can't find out the details.

Another question. Is there somewhere, maybe at the RS232 port, a second output for a led which is the same as used in the badge? It would be nice to have it external because it is out of my normal view and the brightness is very low too.

Originally Posted by tranle

On my downloaded manual on page 6:
(4) RS-232 OUT – Use this port to communicate with a second “daisy-chained” Digital Drive subwoofer. Also, the 12V trigger feature requires a 12V trigger signal (polarity irrelevant) across pins 7 and 9 of this port.

There is also a menu setup to enable the 12v trigger.

Originally Posted by yxvolpe

Where can I get an updated list of Velodyne dealers in Canada? I have send to Velodyne two emails and no answers from them... The support look to be very bad...

Originally Posted by themagicpudding

Hello,

Several months ago I purchased an SPL-1200 Ultra. I'm very happy with the quality and power of the sub's sound however I have a couple of issues I would really appreciate some assistance troubleshooting.

The first issue is the way the sub behaves at low volumes. It produces irregular sound (it cuts in and out) at low volumes or when watching material with little low frequency content. I am aware from reading the forums and the Velodyne support pages that Velodyne subs needs a strong input signal, however the sub still cuts in and out when I have it connected with a Y-cable and have the subwoofer out on the amp set to +12dB when the rest of the speakers are set to -1.5dB to -0.5dB. When it cuts in and out there is an audible click. This happens regardless of whether the auto power feature is set to "active" or "inactive" and regardless of whether I use the 12 volt trigger from the amp.

The second issue I have is that it appears that the auto power off feature cannot be turned off. Even when using the 12 volt trigger from the amp and with the auto power off set to "inactive", the sub does not produce any output until the first piece of content with a significant low frequency (such as a bass drum) is encountered. When it does start producing sound there is also an audible click.

I have tried changing over to my old sub to verify the signal into going into the sub and can confirm that the cutting in and out of the sound does not occur with my old (much cheaper) Yamaha sub.

Does this mean my sub is faulty? Is there anything I can do to stop the sub cutting out? Is there anything I can do to disable the auto power on feature?

Your advice/assistance is greatly appreciated.

Thanks.

Originally Posted by Bert003

Is it possible to use the high-level inputs on the DD-12 with the speaker outputs of a CLASS-D stereo amplifier?

Originally Posted by dougiles

Probably answered before, but how exactly does the signal detection in auto-on work?

Reason being having difficulty with bass light souces such as the TV. It seems it uses the LP filtered signal before sensing, is this correct?

It quite often will stay off watching the TV, will turn on when there is some deep bass, then turn off again minutes later after it has incorrectly decided again there is no audio.

This is a DD-10+, with volume at about 25 through XLR inputs direct from a pre-amp, using through connections to feed a power amp. It should be getting enough signal to turn on reliably. An unpalatable option may be to fit attenuators into the power amp inputs, requiring the pre-amp output to be higher.

I've tried turning the auto-on off, but it didn't seem to make any difference.

Originally Posted by Rob Morse

... what you are describing is the nature of the beast with these switching amps that we are required to use.

Originally Posted by Bert003

Is there somewhere, maybe at the RS232 port, a second output for a led which is the same as used in the logobadge? It would be nice to have it external because it is out of my normal sight and the brightness is very low too.

Originally Posted by catdog2

Hello
Are you hearing any rattling with the distortion? Will the unit distort without a signal ? If no rattling the problem may be in the amp. Please fill out the attached form or call us at 408-465-2851.