New to sigma studio, i purchased the KABD-430 and its factory settings yielded better sound, but afterloadng the 2.1 project everything is lower and the sub in my set up is now almost not effective. wondering what could be the issue. i have added the dynam

not sure what happened with the rest of the question, i added the dynamic bass boost block with not much improvement. 

Hello Corg3D,

What is your end goal as to why you are using the Dynamic Bass block?

We have a few blocks for bass enhancement and control but they are not very well documented. I think this is a good topic for my next video. I actually have one of these KABD-430 boards so I can experiment with it as well. Give me a few days to have the time to work on this. Meanwhile, let me know what you want to do? 

Dave T

Hello Dave, Appreciate the quick reply. Originally I wasn't using the Dynamic Bass Block, As it has a Pot controlled filter to effect the bass, (like the treble on for the stereo speakers. I had also added the 4th POT to control the volume of the sub in case i wanted to turn it down. after i loaded everything up to the EEPROM and went to test. I wasn't happy at all with how little bass there was and also my main volume had to get turned up a lot higher to get the sound levels i got from the factory loaded programming on the KABD-430. Originally in my new to sigma experience i had just loaded the stock Dayton project for the EQ controlled 2.1 file. then went to testing but realized i never saved to the EEPROM and was just utilizing the stock programming. It resulted in a louder experience and a sub that sounded great to the point where one of the pots being turned to much distorted the sub. Basically i was happier with the sound level and sub adjust from the stock programming although not ideal as it wasn't set up for the cross over HZ i was wanting amongst a few other things i was after. I'm guessing at this point i should maybe just add some gain to the volume controls to get the increase i was after and then would have the ability to increase the sub ? (Sorry if this was to wordy of a reply) i have been trying to decipher the stock programming but there is a lot to it. I'm basically wanting a 2.1 set up with better levels and improved adjustment and volume of the sub. I can up load the stock file but as you mentioned you had a board that you could access. (I also don't want to waste a lot of your time) maybe just after a suggestion or two.

Thanks again

Hello Corg3D,

Thanks for the info. It is handy. There must have been something not quite right with how the extra pot was added. 

I just looked and I think I have the stock project. "2.1 Speaker Project with Potentiometer Tone controls.dspproj" is the name correct? 

Send over the first changes you made to that project. 

It seems like you just wanted to be able to turn down the volume of the sub. There are only three pots being used in that project so you simply wanted to add in the fourth pot. There must have been something you missed. 

Also, this project does not have a dedicated subwoofer output. 

Show us what you did. 

Dave T

Hello Dave, 

Correct i used the "2.1 Speaker Project with Pot tone controls" and the only addition i added was a pot to lower the sub output if it was to much depending on what i was listening to. I'm attaching that version. I believe i achieved what i was after in that regard. But my issue is that the original loaded .dspproj (which I'm attaching as well had a lot louder sound and the sub sounded great (i barely had to turn up the volume, my concern was that i wasn't sure what crossovers where in place and I didn't want certain frequencies going to the main speakers or the sub) (I'm including that .dspproj as well. 

I'm mainly curious as to why the "2.1 pot project" doesn't have as loud a volume and the sub doesn't sound good and is quiet. even using the "2.1 pot project" pots for bass and treble tone control. 

Hopefully im making sense :) basically i want to use the "2.1 speaker project with potentiometer tone controls" as well as the 4th pot being used to lower the sub volume if desired, but have it sound alot better than it does as far as bass and volume being louder like the "KABD-430 Stock Firmware"

I spent a lot of time running numbers in regards to port diameter, port length, volume of the enclosure, as well as the volume of the enclosures for my stereo speakers, including the TS parameters in all my number running. so i believe I'm at the point now where my dsp is the last piece of the puzzle. 

Im also including a picture or two of the speaker, as well its running 2 x 2.5" dayton audio full range drivers and 1 x 4" dayton audio woofer. 

Hope this helps with info, i also appreciate you taking the time to dig into this one for me to see what i can add or change to gain the volume levels and bass improvement. 

3146.Corg3d BTS 2 Point 1 Set Up.dspprojKABD-430 Stock Firmware.dspproj

Hello Corg3D,

Thanks for you info. I have been busy with other distractions so today I was able to load up your project. I obviously have different speakers. I have some BR1 speakers with no crossovers and I use the KABD-430 to drive them. Sounds great. However, I am not running in bridged mono so I had to make a few small changes to your project. 

I do not really know why you experienced the loss of volume. I can make a few comments. 

Here is a screenshot of your program:

You are multiplying the output of the AUX ADC pot by 2. This will give you a 6dB boost in the level and could cause some clipping issues. 

In my project I am boosting the audio input from my iPhone by 12dB. You are most likely running at a very low level. You have no meters in your project. How do you know what the levels are? Add some meters on the input and output. 

You also need to add a DC blocking filter right at the input of the signal flow. This will prevent the DC offset of the ADC converters from causing clicks, pops and putting out DC to the amp and speakers!

The other thing that struck me as odd was the setup for the high frequency filters.

It is not symmetrical. It goes from -10dB to +5dB This means that when the pot is mid way it is cutting the treble. 

The low frequency was +-10dB. Personally, I would do more boost and cut but this is your preference. 

Otherwise, I do not see any huge issues. 

Also, it seems like 100Hz is a little on the low side even for a subwoofer seeing that these are small drivers in a small cabinet. However, it seems like you have done your calculations and measurements to see what the speakers are actually putting out at those frequencies? 

Dave T

Hello Dave, No worries on the delay. i really appreciate you taking time to look at this for me. I will remove the gain to avoid the risk of clipping and also a great idea adding the meters. This is all still new to me and will just take some more diving in. I will also add the DC block as pictured. as far as the filters go, the high pass was what came with the sigma KABD project examples, i have not changed anything on it. I will do some reading on setting these up properly as yes when adjusting the pot it did have some weird spots. Unfortunately in my design i  should have built in an access for the JST cable to allow for live tuning once the speaker was sealed up as its effecting the sound of my sub being almost in free air. As for the crossover this was my fault, i realize now the file i sent had it still set to 100hz, i actually have it set to 200 at the moment. I will do some more messing around mainly with the filters and also run the meters. as now with my cell BT volume maxed I'm able to max the speaker and still not have the levels i had with the factory program. Thanks again for the help and now back to tuning ! Take care. (i will also reply and upload the final file once i get some more tuning ect done.)

Hello Corg3D,

Yes, it is always tricky to do the tuning when the amp is actually in the cabinet. I have seen people drill holes to bring out wires but you cannot run the wires too long, 20-30cm or longer is pushing it. Then you have to seal the hole. I suppose you could build a prototype cabinet where you bring out the speaker connections and mount the amp on the outside. 

The level out of the Bluetooth is subject to the level being sent to the transmitter. This is where a meter on the input is helpful to see how loud is the signal coming into the crossover? Then have some meters on the very outputs to see how loud is the signal being sent to the amplifiers after all the EQ, crossovers and volume controls? 

200Hz seems a little better. My approach I usually use is to run sweeps of the speakers in the cabinets and see where they are flat, where they roll off etc. Then see if a crossover point becomes obvious. I like to choose one where the low and HF/mid drivers are both in a flat range so the filter slope will work well for both sides of the crossover point. If you get too close to a drop-off of the driver then you get into the phase issues, and the filter response will not add up properly to make a smooth crossover. There is a lot of information on this all over the web and I take a simple visual approach more than a super analytical approach. But then I am not trying to design a high end monitor either!

Have you found my YouTube channel yet? I do talk about 1701 projects in there and about metering and troubleshooting etc. I plan to put up a video of my work with the KABD-430 and the BR1 speakers. It was a fun project and sounds great. 

(45) How to SigmaDSP and SigmaStudio - YouTube

Dave T