NAD: Crown XTI2000

JoshuaTSP · #1 08-27-2011, 04:00 PM

Power amps sure have come a long way!

Pretty basic minus the built is DSP, Xover, etc....

It was easy to set up and allows you to tweak it while you're using it. Helpful since I could try different High Pass Filter settings and listen for the differences.

What's the typical set up for a bass rig with one of these?

-12dB butterworth HPF at 40Hz?

Do I need a low pass filter? like 7kHz and up or something?

The Yamaha PB-1 seems brighter through the Crown than my Ashdown ABM500EVOII FX Loop.

Overall it seems like a great amp.

thudfromafar · #2 08-27-2011, 04:50 PM

Eh you don't need a low pass.
For HPF, 24db butterworth @ 35 hz if you play 4 string and if your cab is good.

JoshuaTSP · #3 08-27-2011, 05:05 PM

4 or 5 strings tuned to C standard through a SWR 6x10.

thudfromafar · #4 08-27-2011, 08:21 PM

K, what I said stands then.

You could use a low pass if you want to roll off the top end on your bass, like a "highs" EQ.

I considered getting an XTI recently due to the price drop, but I have an xls drivecore that I'm pretty happy with and cant justify getting another amp. Have fun!

JoshuaTSP · #5 08-29-2011, 12:21 PM

Quote:

Originally Posted by thudfromafar

Eh you don't need a low pass.
For HPF, 24db butterworth @ 35 hz if you play 4 string and if your cab is good.

Thanks, I'll try that......I have a 48dB butterworth @ 45hz right now.

That said, I like a tighter low end.....it sounded okay set at 50hz too.

Probably overkill......and I shouldn't be reducing my frequency range that much.

I tried a low pass filter at 7.5khz....which didn't seem like it did anything to the tone, unless I had the horn cranked.
Horn is usually completely off, since I use a lot of dirt.

thudfromafar · #6 08-29-2011, 02:18 PM

Set the HPF wherever it sounds good to you. I sometimes use my crown drivecore @ 50hz and its usually fine for me. However I would set the slope to 24db/octave. I recall greenboy mentioning that 48db/octave makes very little difference and just introduces the potential for more artifacts. (or something like that)

JoshuaTSP · #7 08-29-2011, 02:25 PM

Okay. I will do that.

What does that mean, Artifacts?

rpsands · #8 08-29-2011, 02:29 PM

I use a 48db @ 35hz on my PA and haven't had any problems, but who knows, it's just a practice space - no gigging on the PA yet.

portraitoftracy · #9 09-03-2011, 12:35 PM

I don't touch a thing on my XTI 2000, completely flat, it kills and for $399 new shipped to your door you can't beat it. Especially if you use an Avalon U5 for your pre.

u84six · #10 09-03-2011, 01:04 PM

Quote:

Originally Posted by thudfromafar

K, what I said stands then.

You could use a low pass if you want to roll off the top end on your bass, like a "highs" EQ.

I considered getting an XTI recently due to the price drop, but I have an xls drivecore that I'm pretty happy with and cant justify getting another amp. Have fun!

I just purchased a XLS 2500 to go along with a fEARful 15/6/1. Do you recommend using a low pass filter for that type of setup? I'm not big on bright sounding bass.

thudfromafar · #11 09-04-2011, 02:02 AM

Quote:

Originally Posted by u84six

I just purchased a XLS 2500 to go along with a fEARful 15/6/1. Do you recommend using a low pass filter for that type of setup? I'm not big on bright sounding bass.

:O

That's quite a bit of power. Well, you could flip off the horn and that would cut out lots of brightness. If it's still too bright, work the EQ or experiment with the lowpass if ya feel like it.

If you're running that bridged, especially a 5string, I would definitely use the high pass filter.

tom-g · #12 09-04-2011, 02:08 AM

Quote:

Originally Posted by portraitoftracy

I don't touch a thing on my XTI 2000, completely flat, it kills and for $399 new shipped to your door you can't beat it. Especially if you use an Avalon U5 for your pre.

Those prices make me cry

Over here they are 699 ,- and that's Euros not $.

PhiDeck · #13 09-04-2011, 02:46 AM

Quote:

Originally Posted by JoshuaTSP

What does that mean, Artifacts?

The steeper the slope, the more ripple in the pass-band near the corner frequency.

JoshuaTSP · #14 09-06-2011, 08:32 AM

Thanks.

I didn't notice much difference but I switched the high pass filter to the 24dB Linkwitz-Riley. Seems to work as it should....I shouldn't really notice that it's on.

sawzalot · #15 09-06-2011, 12:17 PM

On my XTi 1000 I think I set a 24dB/octave Linkwitz-Riley HPF at about 20 Hz to protect from ultra-low frequencies getting through at high volume. Seems to work just fine.

I prefer to use the preamp's EQ to tame the high end rather than the LPF on the amp. Doesn't mean the LPF won't work though....

Tom

rpsands · #16 09-06-2011, 12:21 PM

GB made a really good case for the 24db/oct butterworth @ 35hz, and it's how I'd recommend rolling for most people (who don't want to spend a bunch of time using parametric eq to counteract the loss of an LR filter).

JoshuaTSP · #17 09-06-2011, 12:35 PM

What do you mean counteract the loss of a LR filter?

rpsands · #18 09-06-2011, 01:49 PM

LR filters drop off significantly above the crossover frequency. They're down 3db by the xover point, IIRC. * GB corrected this one, 6db for LR, 3db for BW (Woot!)

Look at the software chart plot of a 35hz 24db/oct LR filter vs. a 35hz 24db/oct BW filter in the XTI software.

JoshuaTSP · #19 09-06-2011, 01:56 PM

Yeah, I noticed the difference in the slope.....since I could set one channel up at BW and one as LR HPF and see the difference.

As in, if I liked the 24dB at 50Hz BW, I just changed it to 24dB at 40Hz LR.