Velodyne DD15 - worth repairing the plate amp?

Rythmic sealed 15 in. 

@bryaudioguy  Does anyone out there have the schematic for the DD15 DSP circuits?

I have no idea what the 2019 sale to GmbH may have regarding any of the Plus' processing and functionality. I don't believe there's been a processing upgrade. I would have expected at least a smart phone interface. May be there is?

Compared to the basic Digital Drive the vastly simplified Velodyne Plus processing was never properly reviewed. While the Users Manuals described the how to functions they lacked any what to listen for suggestions.

Regardless of the users satisfaction with the Plus' initial Auto EQ settings the simple Drag and Drop functionality of the unreviewed Frequency Response and Parameters Screen (page 10-11 of the User Interface Manual) made the previously tedious DD manual adjustments now simple and on the fly.  

I'm guessing soon after the release of the Plus there may have been many issues that interrupted a substantial marketing strategy for the only idiot proof subwoofer I'm aware of.    

This reporting may be of some interest. 

https://www.audioholics.com/search?SearchableText=Velodyne+Acoustics+Implements++TI+controlers

Hello,

Does anyone out there have the schematic for the DD15 DSP circuits?

I found the schematic for the class-D amplfier circuit that is used in several Velodyne subwoofer models on line but that's all I can find. 

Thanks in advance.

That is a great idea, kind of like rotating your tires. Not sure if it would  have any effect on the sounds I am hearing. I would just like to replace all the parts in the amp that may be bad do to age.

@jomolu Something simple to try would be to rotate the driver 180 degrees, mindful of over tightening the fasteners. Even with no improvement it can hurt.

I have the older Velodyne F-1500 been in continuous use for 30 years. Starting to. notice some odd low level sounds fluttering buzzing. Would that be caps needing replacement. Still sounds great to me just noticed the sound when I am up close to it and the level is low. Thinking I may try to re cap myself. Anyone here done it? how difficult is it?

csmgolf, you are correct. I was wrong about the quick setup button.

There is a second mic input on the front of the DD-15 and 18. So you don’t have to move the subs to connect it.

Replacing the plate amp with another is not really an option considering the power(1250 watts) and abilities of the Velodyne model. And there’s also a video output for complete setup.

Replacing the plate amp (or using external amp as I currently do) means NOT having the 'SERVO' control feature the Velodyne was/is famous for. I would assume that this is part of the high regard and performance those Velodyne are known for in comparison to 'lesser' subs. Plus from a budget standpoint: what do you get for say $500 budget? A plate (or external amp) vs a repaired Velodyne with Servo Control/room accoustic. 

Has anyone compared 'just amp' vs 'Velodyne control/amp' ? Maybe the DD15 has a setting 'straight/direct', basically just using the amp and bypassing the Velodyne servo feature?

I would replace the plate amp.  There are many plate amp options out there.  Parts Express has a good selection.  No need for a very high-end amp on a sub.  I seriously doubt you'll hear a difference.  Concentrate on the inputs, power rating and features you want on it instead.  If the opening size is different, you can cut out the existing hole to match and if too large you can just add a piece of plywood or particle board over the existing hole opening, paint it and fit the new plate amp! 

Thanks, I need to read the manual (already downlaoded a while ago).

I believe the DD manual discusses sub positioning on an earlier page. This "TIP" on page 23 is incredibly important. It provides for the optimum sub to room interface which results in the least amount of amplifier power, guided by the software is used to Optimize and correct an improperly located sub. 

(Page 23 DD User Manual)   TIP: Here’s an easy way to find the optimal position for the subwoofer without moving it to multiple positions in the room. Start by setting the subwoofer up in your listening position. now, move the microphone around the room and observe the response graphs for different room positions. The best position has the fewest valleys and the overall smoothest response.

Since the DD manuals publication rather than using the microphone along with the Sweep Tones the later DD Plus manual suggests using the Subwoofer Crawl (walk) method during the Sweep Tones and listening for and mapping the rooms standing wave bass modes for the optimum sub positions. There are various Youtubes demonstrating the Crawl. Good luck with it. 

But there is a quick setup button on the back of the sub. 

@rwwear Are you sure of this? He is using the DD, not the DD plus. There is an auto-eq function that can be done pretty quickly using the remote on the DD. I don't see anything in the manual referencing what you are referring to.

You do need the remote and a video hookup. But there is a quick setup button on the back of the sub. Read the manual!

It has composite video out for on-screen display. It does not connect to a computer. The computer connections are for software updates. It does require the remote and on-screen display to set everything up. It runs frequency sweeps that you can see in real time. It has graphic and parametric eq capability. Just read the manual.

Thanks, I need to read the manual (already downlaoded a while ago). So the DD-15 HAS computer connection. Do I have a remote (need to check) for the DD-15? If so, hope I did not misplace it somehow.

The microphone connects to the plate amp. There is also a video output that you connect a monitor to. You would be best printing a copy of the manual for the sub and following what it says. The manual for the SMS-1 is pretty similar. There is a lot of information in that manual that will answer many of your questions and describes in detail how to set it up. It is available on the Velodyne site.

 https://velodyneacoustics.com/pdf/digitaldrive/DDManual.pdf

So how do I use the provided measuring (velodyne) microphone if not via computer?

The DD series doesn't connect to a computer. The plus series does. Although there is a way to upgrade the firmware for the DD series with a computer but it takes a special cable from USB to serial

I have not connected the DD to a computer (waiting for amp to be returned from repair). Will then look into the software, potential update and how to use the software, microphone, etc. 

@emailists  Are you saying there is new firmware for the DDplus series?  Can you elaborate?

I don't know. My DD Plus are 2.2.3. You might try an email to Velodyne Acoustics GmbH.

I fixed a remote control by removing the batteries, carefully opening the case and cleaning the wire board with alcohol and compressed air.

@m-db i’m a little late to the discussion.  Are you saying there is new firmware for the DDplus series?  Can you elaborate?

Early this year my pair of DD10plus subs weren’t responding to the remotes, so I sent them to the amp man.  I wish I had known about the guy in NJ since I probably could have driven the plates there.  Amp man seemed to struggle with various issues, but he did get them working perfectly.  

I’m glad Velodyne is back in business selling subs.  I really like my subs and run hem well below 40hz using the eq, since my TAD CR1’s go down to high 30’s.  

One of the things that drew me to The plus series is that they were designed to play really low bass.  I’m actually running mine in a huge room and I also keep them on sistrum stands 20” off the floor, which reduces output, but I feel makes them sound more articulate.  

Since I’m in a city condo loft, I didn’t want massive bass to avoid complaints.  
Suprising, but even a pair of 10” drivers gives me the kind of subtle, deep bass I’m looking for, and does double duty for 2 channel and Home Theater, even though I leave the servos at the highest setting, even for movies.  

I also like that I can change the slope on the fly, for bass shy recordings.  
 

No. I sent out the amp for repair to NJ. 

Have you contacted Velodyne? They may send you a newer amp to swap out. Or purchase a rebuilt amp from them. I had a HGS 18 inch sub and i took it to the factory direct (about 2 hours from where i live) they fixed it and upgraded it very cheaply (cost wise). and i had it back with in 1hour.

Who has (no or in the past) tested (incl published tests) the DD15 against - old or new - subs in the (new or used) price range? 

What are strong pionts? What are weaknesses? 

HSU nor SVS beats a Velodyne. Do not allow the age of a product to cloud judgement. The DD15 is worth repairing.

Happy Listening!

Warm it up with a hair dryer or heat gun.   Then use appropriate pick in the screw holes to lift 

To remove the amp when stuck I tapped on the plate lightly with a rubber mallet. It loosened right up.

HSU was also mentioned. and maybe the sealed SVS SB-3000 is a better comparison to the DD15.

If ported is tolerated, then the PB-3000 and HSU VTF-3 may fall into the ($1,000, used) category. HSU 15 looks seriously (way too) big, approaching the size of my 4.0 ft3 sealed 18" on the main system. 

No way that SVS is as good as the Velodyne.  That is absolutely worth repairing.   Pitch definition and power on those 15" DD are awesome.  My brother's HGS 15 II rocks , not many new subs can rival those servo subs in my opinion.    

I seriously doubt the SVS-SB2000 is better than the Velodyne DD15.  Contrary to Chat GPT, the DD15 has more power and better extension than the SB2000.  A 15 inch driver has a lot more surface area than a 12.  It's proportional to the radius squared and that's 56.25 to 36.  The Velodyne is also a servo sub which keeps distortion below 1%.  You can't hear 1% distortion in deep bass so it is distortion free for all practical purposes.  I don't have anything against SVS but a sub that is $899 now is equivalent to maybe $500 20 years ago.  The Velodyne was 6 times that.  I know business models have changed and Velodyne's prices were too high but technology hasn't changed that much.  The DD15 has a 24lb magnet.  I recently looked at the driver on my DD18 when I pulled out the amp and it's an impressive looking driver.  It was not a budget product.  

Always worth looking at https://data-bass.com/#/?_k=mlkn4f

Maybe someone has a side by side comparision of the modern SVS SB-2000 and the Velodyne DD15?

Hey, @tokushi - what's with your use of AI?

Don't you have any original thoughts?

1. Repair Cost: If the cost of repairing the amplifier, including shipping, tax, and any potential labor charges, is around $500, it may be worth considering, especially if you have a strong attachment to the subwoofer or if you believe the subwoofer still performs well in your setup.

2. Subwoofer Performance: The Velodyne DD-15 was a capable subwoofer in its time, but advancements in subwoofer technology have occurred since 2008. Newer subwoofers, like the SVS SB-2000 or SB-3000, offer more power, better bass extension, and improved features. If you're looking for enhanced performance and modern features, upgrading to a newer subwoofer might be a better option.

3. Compatibility and Features: Consider the features you need, such as room calibration, connectivity options, and integration with your existing audio setup. Modern subwoofers often have advanced features that can enhance your listening experience.

4. Budget: If your budget allows, investing in a newer subwoofer might provide you with a more satisfying and up-to-date audio experience. Both the SVS SB-2000 and SB-3000 are well-regarded subwoofers, and their performance can be significantly better than the Velodyne DD-15, especially if you have the space and budget for them.

Ultimately, the decision to repair the Velodyne DD-15 or upgrade to a new subwoofer depends on your preferences, priorities, and budget. If you're looking for improved performance and features, a new subwoofer like the SVS models you mentioned may be a good choice. However, if you have a strong sentimental attachment to the Velodyne or are satisfied with its performance, repairing it may also be a viable option.

ebxya.com

If nothing works: put 2 wood screws (in new holes, small pre drill but not all the way through) in. 

I often half insert the screws back in, push/pull them to the side (to jam) and apply lifting force to seperate the seal tape from the wood.

I didn't have too much trouble getting the amp out but I'm not surprised it happens.  There's no adhesive but I think some sort of gasket maybe is sticky.  It'll come, worst case scenario you have to accept a little cabinet damage and pry it out with a screw driver.  

This may sound silly but what are you all doing to pry these plate amps out of DD-15s and such? Mine has developed an intermittent blatting sound and the dang amp doesn't want to budge. I'm sure there's an adhesive from the factory involved. I'm nervous to pull any harder on the hi-level input banana jacks.

Currently driving it with an external class H brute, 'no controlled'. Does the job. Surprised how much amps it sucks in. Switched the class D to mono bridge mode to stay out of the first red clipping light flickering at high volume. Amp is QSC 702. Assuming the Velodyne is 4 ohm, the clipping light (assuming 1% THD) should come on at way over 1000 W (see specs below). So the Velodyne really wants to be FED: 

kraftwerkturbo

I have enjoyed reading about your Repair/Service process for DD15 subwoofer.

This one is a keeper. Yes, the DD series utilizes a microphone to dial-in, equalize, the Sub to your room as above. Keep up the excellent coverage.

Happy Listening!

https://velodyneacoustics.com/pdf/digitaldrive/DDManual.pdf

Have you ever used the video out on the Velodyne? The DD series uses the microphone to equalize the sub to your room. I believe the standard xover is set at 80. You can set the xover to whatever and for 5 different settings. You can also use the parametric EQ and manually adjust the output at different frequencies. But to do so you need to use the video out from the sub. There's lot's of settings you can access by using the video out. If you don't have a manual, download one.

I need to read up on how Velodyne's software/hardware works. Does it have an equalizer? How does it measure the movement of the speaker cone or how does the feedback control work? Or what crossover frequency the Velodyne uses (fixed? or adjustable based on measurement with their mic of in room accustics)?

I would just run Audessy normally then go into to manual setup and set the sub's xover higher than Velodyne's internal one. Adjust mains if possible to match the sub.

Goood to know. Looking forward (hopefully soon) to get plate amp back from EBC and do a comparison switch: Audessy with external class H amp vs built in Velodyne optimization and amp. 

What settings on the receiver do I need to choose when running Audessy for 5.1 (on the 5 and not the 0.1)?

Usually, unless things have changed, Audessy doesn't do that much to equalize subwoofers. And I would also assume that Velodyne's EQ works more closely with it's internal amp. But I could be wrong because miniDSP is supposed to work great for subs.

How good is my Audyssey built into my receiver setting up the sub in my room?

When using the built in plate amp, should I set up with Velodyne hardware/software (and how to disable Audissey/Receiver for the sub only) or switch off Velodyne and run full Audyssey? Or both. I need/want to run Audyssey for the other channels (I do listen to SACD and Stereo). Receiver on my office system (where DD15 currently is used) is my little Onkyo TX-SR353, which uses AccuEQ:

Onkyo TX-SR353 comes with AccuEQ room correction system and includes the calibration microphone.

• AccuEQ: First, AccuEQ detects the presence of speakers and evaluates the impedance of each. Next, it pinpoints their distance relative to the main listening position using the mic and sets suitable sound-pressure levels. Then it selects the optimal crossover frequency so that deeper bass rolls smoothly off to the subwoofer. Finally, AccuEQ performs frequency response equalization based on room-acoustic and speaker data collected via microphone. The sound-field is now tailored around the listening position, resulting in a more immersive and realistic in-film experience.

It's a great product if you want a simple way to set up subs that don't have built in room correction.

Minidsp does more but requires a computer. Once set up it doesn't anymore though.https://www.minidsp.com/

https://www.outlawaudio.com/products/SMS_manual.pd

This is the Hall brothers first release of subwoofer Equalizing I believe based on the Texas instruments platform using Velodyne custom designed parameters. Shortly after the SMS release the Digital Drive was rumored with an advanced servo circuit, driver and cabinet. The component SMS may have been geared toward supporting the companies legacy products and third party subwoofers?

Despite its age the SMS can provide more detailed capabilities than a number of current low frequency processing designs.

It's an outboard version the one built into the Velodyne DD series. You can use it with any sub though. Can be used as a replacement for the Velodyne built in EQ if needed.

rwwear: what does it do? similar to what audyssey does (measure room sound, make correction in time and equalizing frequencies, automatically)?