Jump to content


JBL STX with Crown XTI-2 6002

STX XTI High Mids Harsh

  • Please log in to reply
2 replies to this topic

#1 ramu745

ramu745
  • Members
  • 2 posts

Posted 18 January 2014 - 02:21 PM

Hi All,

I just bought the below
Crown XTI 2 Series 6002 Amps - 2no. [2100W per Channel @ 4Ohms] [Not sure if this RMS or Peak Power]
JBL STX 825 - 2no [1200W / 2400W / 4800W @ 4ohms] [Continuous / Program / Peak]
JBL STX 828s - 2no [2000W / 4000W / 8000W @ 4ohms] [Continuous / Program / Peak]


I did a test run on these running 2-825s on one Amp and the 2-828s on the other Amp.

I used the Amp tunings from JBL site for XTIs [http://asia.jblpro.c...1927&doctype=3]

The subs are amazing. They really give me good thump.

But coming to the 825 full range speaker, they sound very harsh around 2k to 6k range and the clarity is missing. These frequencies are so loud and masking the others range of frequencies. I tried playing different music but the result is same.

I used ST and LT (Short and Long Throw) tunings with and without subs but could not get a clean sounding.

Then i tried with DSP Off and the its the same. The 2k to 6k (or say 8k) range is really masking everthing else and there is no clarity.


One more doubt is these Amps give me 6000W into 4Ohms when bridged. But the Amp input max current rating is around 15Amps.
At 230V, it will draw power equal to 3.45kW. I am not sure if the 6000W is peak power

Am I missing something? Please suggest.


Thanks
Ram

#2 dakos

dakos

    Admin

  • Members
  • PipPipPipPipPip
  • 762 posts

Posted 19 January 2014 - 06:07 PM

 ramu745, on 18 January 2014 - 02:21 PM, said:

Hi All,

I just bought the below
Crown XTI 2 Series 6002 Amps - 2no. [2100W per Channel @ 4Ohms] [Not sure if this RMS or Peak Power]
JBL STX 825 - 2no [1200W / 2400W / 4800W @ 4ohms] [Continuous / Program / Peak]
JBL STX 828s - 2no [2000W / 4000W / 8000W @ 4ohms] [Continuous / Program / Peak]


I did a test run on these running 2-825s on one Amp and the 2-828s on the other Amp.

I used the Amp tunings from JBL site for XTIs [http://asia.jblpro.c...1927&doctype=3]

The subs are amazing. They really give me good thump.

But coming to the 825 full range speaker, they sound very harsh around 2k to 6k range and the clarity is missing. These frequencies are so loud and masking the others range of frequencies. I tried playing different music but the result is same.

I used ST and LT (Short and Long Throw) tunings with and without subs but could not get a clean sounding.

Then i tried with DSP Off and the its the same. The 2k to 6k (or say 8k) range is really masking everthing else and there is no clarity.

JBL are pretty known for their hash sounding speakers for many years now, Just google "JBL harsh EQ" and you'll see what I mean. This could also be due to low quality source, are you playing mp3 or some other compressed media? Are you using a good usb to XLR converter? Did you also listen to them outdoors or just indoors? If only indoors, describe the room you were playing in or better yet, upload some pictures.

My guess is you listened to them EQ'ed in a good way and you liked the sound so you bought them? so all you need to do is EQ them to the point that you like the sound.

 ramu745, on 18 January 2014 - 02:21 PM, said:

One more doubt is these Amps give me 6000W into 4Ohms when bridged. But the Amp input max current rating is around 15Amps.
At 230V, it will draw power equal to 3.45kW. I am not sure if the 6000W is peak power

Am I missing something? Please suggest.


Thanks
Ram

Look here for the answer:
http://www.crownaudi...?showtopic=3907

Avi

#3 ramu745

ramu745
  • Members
  • 2 posts

Posted 20 January 2014 - 11:49 AM

Hi Avi

Thanks for your reply.

Yes, I was using compressed audio during the test outdoors :mellow: .
Infact I had no audience or charis at all. Its completely an open ground.

I will try to do the EQ for the tunings.

I guess, I understood how the Crown power ratings are calculated. I may have to re-analyse my calculations.

I will get back with the updates on my tunings.

Thanks
Ram





Also tagged with one or more of these keywords: STX, XTI, High Mids, Harsh