Crown xti DSP Settings.

[James R]

Hello, I'm picking up a XTI 4000 tonight maybe tomorrow to run my 4 T48's and wondered if anyone has some settings for this.

Thanks,
Jim

[James R]

XTi2000 Ch1. input from mixer mains in mono.
Internally, the XTi splits the signal. I bandpass into subs (Ch1) and tops (Ch 2):

Subs: 35-100 Hz (-48 LR filters)
EQ: not needed for a pair of 3015 loaded Titan subs.
Limiters set to - 6 dB.

Tops:100 Hz - 16kHz (-48 LR filters)
EQ: Suitable for Dr250 tops with 2510s in them.
Limiters set to - 6 dB.

Don't use the subsonic harmonizer - weird things happen in the sub output - like synthesized vocals.

I preset the fans to run on high since they don't seem to run very often otherwise.

How did you preset the fans, I read the manual and could not find anything about this.
I just got a XTI 4000

Thanks,
Jim

[Alan Star]

From memory you can hold the "select" (first) button in when you power it up and this will toggle the fan setting between 'always full on' and 'thermo controlled'. I had a problem with one of mine that the fan wasn't coming on automatically so I did this and now it just runs full on all the time. Which is fine by me.

[novasak]

From memory you can hold the "select" (first) button in when you power it up and this will toggle the fan setting between 'always full on' and 'thermo controlled'. I had a problem with one of mine that the fan wasn't coming on automatically so I did this and now it just runs full on all the time. Which is fine by me.

yeah, hold the select button on start up. I think there are 3 modes, always on, auto hi and auto lo. One of the auto settings runs full speed more often, the other is less sensitive. I have mine on auto with full speed more often, I forget which setting it is listed as.

[chrapladm]

I hope know one said this before but I didn't see it. I have a Crown Xti1000. It is powering my Accugroove cabinet for now. I was trying to play around with the presets and stuff but honestly I have know idea what I am doing. The main thing I am trying to atleast be able to do is set the low frequency cutoff. Or high pass...I dont know what it is called. But I have a MAC computer and wanted to know if anyone knows how I can change the cutoff frequency?

I can cut the high frequency off but thats it. I can also select SUB SYNTH which is pretty fun playing my bass through and shaking everything in my bedroom but thats all. On the SUB SYNTH the 10" drivers look like they want to jump out of the cabinet even at low volumes. (1400watts bridged low volume)

Anyways can someone please help. Thanks

[Alan Star]

Either get windows running on your mac (if you have intel mac) or get a separate windows machine, then download 'HiQnet System Architect' from here > http://hiqnet.harmanpro.com/downloads.php Plug in amp to computer with usb cable, and hopefully the amp will pop up in System Architect, then it's real easy to configure it how you want.

[bzb]

Sorry to drum up an old subject - but how do the limiters translate to the voltage recommendations in the plans? Specifically, what does the -6 dB that you guys are doing on your 3015s represent?

Trying to figure out how to set this thing up for my BP102 loaded T39s.

[sine143]

Um.... I'm not exactly sure here man, but I remember reading somewhere that

3db is double the watts,
6 db is double the cabs
10 db is double the volume

THis means that if you are driving your T39s through 1 channel on your xti 1000, you are getting 500 watts at 4 ohms from that channel, meaning 250 to each cab. If you set your limiters to -3 db, the max the amp can supply is 250 watts to that channel at 4 ohms, meaning 125 to each cab.

I think....

I might be wrong, I'm just kicking this from my head, and as you know, I'm a noob.


EDIT

also, this doesnt account for those death spikes that get it up to like 1200 watts.

[Landl.livesound]

Um.... I'm not exactly sure here man, but I remember reading somewhere that

3db is double the watts,
6 db is double the cabs
10 db is double the volume

THis means that if you are driving your T39s through 1 channel on your xti 1000, you are getting 500 watts at 4 ohms from that channel, meaning 250 to each cab. If you set your limiters to -3 db, the max the amp can supply is 250 watts to that channel at 4 ohms, meaning 125 to each cab.

I think....

I might be wrong, I'm just kicking this from my head, and as you know, I'm a noob.


EDIT

also, this doesnt account for those death spikes that get it up to like 1200 watts.

Hey Sine,

It runs something like this; that for a theoretical increase of +3dB in acoustic output you need double the power. When you double the amount of cabs that you use (But keep the power the same) that combine completely constructively you will get a theoretical increase of +3dB. Then if you double the power going to those cabs you get the +3dB from doubling of power. So total of +6dB if doubling cabs and doubling power.


And yes, the 10dB is about the amount of SPL increase it takes for people to say the level has doubled.

Take Care!
Phil

[sine143]

So, my assumption as far as math goes would be correct then right? If you runs his xti 1000 at a limit level of -3 db, hes cutting the total output level from that channel in half correct?

[jcmbowman]

So, my assumption as far as math goes would be correct then right? If you runs his xti 1000 at a limit level of -3 db, hes cutting the total output level from that channel in half correct?

Correct.

[sine143]

Yess... Good to get something right!

But back on topic. I notice that lots of people are running 48db LR sloped xovers. Why run LR over buttersworth, and are you noticing any seperation between tops and subs with such a steep slope? I've not had time to adequately eq my system, so I'm only running 24 db buttersworth, with a 48db buttsworth for the hipass on the subs, with no changes on the eq as of yet.

[jcmbowman]

Yess... Good to get something right!

But back on topic. I notice that lots of people are running 48db LR sloped xovers. Why run LR over buttersworth, and are you noticing any seperation between tops and subs with such a steep slope? I've not had time to adequately eq my system, so I'm only running 24 db buttersworth, with a 48db buttsworth for the hipass on the subs, with no changes on the eq as of yet.

It's actually preferable to use a steeper slop on the crossovers, so long as you have the correct values for the LPF and HPF on the respective speakers. This is especially true when you have a clustered sub stack that is not immediately underneath the mid/hi boxes. The steep slope keeps the speakers from overlapping in their coverage of the frequencies close to the crossover, which helps significantly with phase issues.

[Landl.livesound]

Yess... Good to get something right!

But back on topic. I notice that lots of people are running 48db LR sloped xovers. Why run LR over buttersworth, and are you noticing any seperation between tops and subs with such a steep slope? I've not had time to adequately eq my system, so I'm only running 24 db buttersworth, with a 48db buttsworth for the hipass on the subs, with no changes on the eq as of yet.

Hey Sine,


The one reason you see more 24dB/Octave recommended than 48dB/octave, is the 8 pole filter is much harder to get right in a design because of how steep it is, and if I recall correctly you will see more phase shift along with the filter.

It is probably a good idea to use 24dB/octave unless you have access/experience using a some sort of FFT analyzer like Smaart so you can get the crossover region right. Although when you are just throwing up a system in different rooms you might not notice as much of a difference at first.

I was surprised by how much of a difference there was when I went from 4 pole to 8 pole filters and it wasn't an improvement at all. I am sure if I take the system outside in the spring and align it outside with Smaart I will be able to get something much more usable.

But besides that I would suggest 4 pole filters unless you know the reasons why you need the 8 pole for your specific system and can make sure you get the crossover region right!



(Actually many times you will see mismatched filters, say like 3 pole on one side and 4 pole on the other, since it is the final acoustic crossover that matters, not the electrical one. But without a good measurement system that takes time into consideration it is much harder to do.)


Take Care!
Phil

[Tom Smit]

Yess... Good to get something right!

But back on topic. I notice that lots of people are running 48db LR sloped xovers. Why run LR over buttersworth, and are you noticing any seperation between tops and subs with such a steep slope? I've not had time to adequately eq my system, so I'm only running 24 db buttersworth, with a 48db buttsworth for the hipass on the subs, with no changes on the eq as of yet.

Hey Sine,


The one reason you see more 24dB/Octave recommended than 48dB/octave, is the 8 pole filter is much harder to get right in a design because of how steep it is, and if I recall correctly you will see more phase shift along with the filter.


Take Care!
Phil

I'm stepping rather gingerly here since I don't have the experience. From what I've read on the forum here, is that the preferred is LR and at 48db. Struggles have occurred with 48db Buttersworth.

Make sense?