Plenty of ultra low bass, but nothing from 40-100hz?

[tuna]

Thank you everybody for the responses. I thought something was not making sense. Im really looking forward to trying to get these cabs working as destroying the neighborhood is just what I had in mind. Well... the neighborhood in the desert anyway. With regards to a Butterworth filter, that is something that I would setup using a DCX crossover right? After reading everything here I do have a DCX and DEQ but I have yet to start playing around with them as I have never had separate subwoofers I could spend time with playing around with settings.

Im probably going to end up going with the Kappalites for these boxes. I am going to try and get one of the boxes going very soon here. Hopefully it all turns out well and I have a better experience than the original owner. Worst case, I have some 15" drivers to build my own Tubas.

[tuna]

So, I finally was able to put the scratch together to get a new amplifier as well as to buy two Eminence 3015LFs to go into this box I got. I use my sound system in my warehouse. For every day fun I have a Mackie SRM1801 subwoofer. When we are throwing a party... I usually stack three of those SRM1801s next to each other to get enough bass to keep a crowd happy. Well, I finally cranked up the Tuba 36 with two 3015LFs and holy shit it blew the 3 Mackie SRM1801s out of the water. And thats 900w up against 1500. Way better sound and way more bass.

I am very thankful for all of the help I have received on this forum particularly from the owner. Thank you everybody. This is really my first dive into sound at this level and this definitely kicks things up a notch for me. Particularly discussions about subwoofer placement.

At first I had the mouth of the box pointed towards the middle of the warehouse. If you were standing in front of it... it blew you away. But only directly in front of it. I moved it towards the middle of the room and put it right up against the wall. I now have a big box almost right on the dancefloor but there is not a single place on the dancefloor that does not get good bass. I took the advice of others here and did a highpass 12-Butterworth @45 hz and a L-R cut at 120hz and everything sounds phenomenal. I was able to crank my system up and was able to max out at 120db in the middle of the room with no clipping.

Ive never had better sound. I cannot wait to have another party and see what my local DJ talent can throw at this system.


Big thanks to everybody that has helped me on this forum!

[Tom Smit]

[Grant Bunter]

Congratulations of finishing and the result

yes yes

Can you just run us through your HP and LP please. I've seen what you've typed, and I would have thought that the recommendation to be more like:
High pass LR filter 24dB (or 48dB) at 45Hz
Low Pass (in your case) 120Hz Butterworth 12dB

And what are you using to brick wall limit?

[Chris_Allen]

Can you just run us through your HP and LP please. I've seen what you've typed, and I would have thought that the recommendation to be more like:
High pass LR filter 24dB (or 48dB) at 45Hz
Low Pass (in your case) 120Hz Butterworth 12dB

And what are you using to brick wall limit?

+1

I would definitely run as high a slope as I could on the high pass and the DCX is capable of a 48db LR.

Did you check for leaks when you finished up the cab? and are the 3015LF's broken in? (the 3015LF is such a fantastic driver!)

Grant's question about the limiter is an important one, especially since it sounds like you already have the equipment to set one.

Without checking the plans, can you cross the T36 a little lower than 45Hz?

[escapemcp]

Without checking the plans, can you cross the T36 a little lower than 45Hz?

Is this to correct for a peaky low end response perhaps... using a shallower slope and combining it with a higher crossover point means that at 30Hz the output will be down by quite a decent amount (perhaps around 10dB-ish in this case?? ). This is the same approach Radian (& others (& I)) use to tame the rising response of the Tubas (55Hz, 12dB/oct).

[tuna]

I might have misspoke on the crossover points. It is set for everything higher than 45 hz(using a butterworth filter) and everything lower than 120hz to go to the subwoofer. Everything above 120hz goes to my top cabs using a linkwitz riley filter on each side. I used this as I had read that with the butterworth there was a cancellation at crossover point. I guess I need to review all of that some more. I guess that is the very next step for me. To learn how to setup crossovers and EQ better. I have been playing around with them and everything sounds phenomenal. Way better than just the stock sound with no EQ through them. I am just learning how to use my equipment.

With butterworth and linkwitz-riley filters, what is the difference between 12/24/48 octave settings?

With regards to breaking in the speakers, yes I did. I hung them both up and put a 60hz sine wave through em for about 36 hours.

On limiting... I need to learn how to set this using my DEQ/DCX combo. Right now I am not sure. My amplifier had a limiter button builtin so I have this turned on. I am relying on that right now. I am guessing that that is not optimal.

[Grant Bunter]

You were lucky you didn't blow your new drivers.

Butterworth and LR are two types of filters. They have different slopes. Search out the two on google so your can see some pics of what the slopes look like, especially at a crossover point.
You will notice that a butterworth filter sums at the crossover point, LR doesn't.

12/24/48 refers to the amount of reduction in dB/octave.

As I mentioned, for your high pass (the 45Hz setting) you should use a steep filter (LR is more steep than Butterworth) with a minimum setting of 24. As you have a DCX, you can also select 48 there. Your low pass may be ok with a 12 if you want your sub to be playing some of the same material your tops do. That's not how it's normally done though.

Go through your DCX settings with this thread:
http://billfitzmaurice.info/forum/viewt ... =4&t=20833.

Don't do the part labelled EQ though. That part can be done on your DEQ with either the PEQ or GEQ pages.

Have a look at that thread and run through your DCX to verify everything, then get back to us and we can tell you how to set the limiter. No, the onboard amp limiter when you push a button is not enough...

[tuna]

Ok. I went through the setup and everything is setup properly for stereo mode. I have a left, right and subwoofer output channel from the DCX. I have the subwoofer highpassed at 40hz and lowpassed at 100hz (do I have that right?) Is that a good range for this subwoofer? Should i use butterworth or linkwitz-riley here? On the DCX it showed the butterworth as being a steeper curve visually. For the mid-high channel 1 and 2, I have them highpassed at 100hz and lowpassed at 19.6khz. That seems right to me.

So where should I go from here when setting the limiters?

Thank you for your help!

[Tom Smit]

Second last post on page one of the thread. http://billfitzmaurice.info/forum/viewt ... =4&t=20833

[tuna]

I did see that but I figured there was more to it. It looks like I just need the right numbers.

"So leave the value as 0dB for the time being. If you don't know how to get the maximum output in volts from your amp, so you know how to adjust this setting, please ask. The amount of limiting required will vary depending on amp brand/model/type, and the driver you selected for your sub build."

I am powering 2X 3015LF drivers using a Carvin DCM3000 amp. What should I set the limiter to?

[DJPhatman]

I am powering 2X 3015LF drivers using a Carvin DCM3000 amp. What should I set the limiter to?

No more than 50VAC at the amp output terminals for parallel wired drivers. Set it with no speakers attached, using a 50Hz sine wave. But first, lower the frequency of your high-pass to 35Hz and use the 48dB slope. Make sure the limiters are set after any changes in the signal chain (source, mixer, EQ, etc).

[tuna]

Does it matter if I use butterworth or linkwitz riley slopes?

[sine143]

always use butterworth on hipass. the lowpass is a matter of personal preference. with titans, I use a LR lopass to tame the sensitivity around the xover region.

[Grant Bunter]

I am powering 2X 3015LF drivers using a Carvin DCM3000 amp. What should I set the limiter to?

No more than 50VAC at the amp output terminals for parallel wired drivers. Set it with no speakers attached, using a 50Hz sine wave. But first, lower the frequency of your high-pass to 35Hz and use the 48dB slope. Make sure the limiters are set after any changes in the signal chain (source, mixer, EQ, etc).

+1.
I'll just say though, that the limiter increments are in dB. So while you are measuring output on your amp with a multimeter, you turn the large dial to go from 0dB to minus XdB. Where X = the amount required to get 50V on your amplifier output.