ProSoundWeb Community

Please login or register.

Login with username, password and session length
Advanced search  

Pages: 1 2 [All]   Go Down

Author Topic: JBL STX825 how many SRX81SP  (Read 521 times)

Kiriakidis Christos

  • Newbie
  • *
  • Offline Offline
  • Posts: 4
JBL STX825 how many SRX81SP
« on: March 14, 2019, 05:14:37 am »

Hello to everyone
I own 2 jbl stx825 amplified with 1 crown xti6002, i recently owned 2 srx818sp.
The bass from the subs is very little in comparison the bass from the stx. How many srx818sp i must have to have correct system audio output? To feel the bass from the srx818sp's
« Last Edit: March 14, 2019, 05:55:43 am by kiriakidis86 »
Logged

Will Knight

  • Sr. Member
  • ****
  • Online Online
  • Posts: 250
Re: JBL STX825 how many SRX81SP
« Reply #1 on: March 14, 2019, 06:41:14 am »

Please immediately go to your Profile and change your User Name to your real First and Last Name as required by the Forum Rules presented to you at the time of registration or your post will be locked by the moderators.


Sent from my iPhone using Tapatalk
Logged

Kiriakidis Christos

  • Newbie
  • *
  • Offline Offline
  • Posts: 4
Re: JBL STX825 how many SRX81SP
« Reply #2 on: March 14, 2019, 08:38:24 am »

I did it. Thank you.

Anyone who knows about jbl stx/srx?
« Last Edit: March 14, 2019, 08:43:12 am by Kiriakidis Christos »
Logged

Dave Guilford

  • Full Member
  • ***
  • Offline Offline
  • Posts: 140
Re: JBL STX825 how many SRX81SP
« Reply #3 on: March 14, 2019, 08:49:40 am »

I use 2 stx825 and 2 stx828 at local club.  It works
Logged

Will Knight

  • Sr. Member
  • ****
  • Online Online
  • Posts: 250
Re: JBL STX825 how many SRX81SP
« Reply #4 on: March 14, 2019, 08:56:11 am »

The Srx818ís can and do get plenty loud. How are they set up and using them ? Music playback? Band? How large is the venue or room? The more information you can provide in detail, the better we can answer your questions. 


Sent from my iPhone using Tapatalk
Logged

Will Knight

  • Sr. Member
  • ****
  • Online Online
  • Posts: 250
JBL STX825 how many SRX81SP
« Reply #5 on: March 14, 2019, 08:56:27 am »

Double post. Deleted.
Logged

Kiriakidis Christos

  • Newbie
  • *
  • Offline Offline
  • Posts: 4
Re: JBL STX825 how many SRX81SP
« Reply #6 on: March 14, 2019, 09:41:02 am »

I am a wedding dj, the venus are about 500-600 people, inside and outside. I was ok with the stx825 without subs but i wanted more bass, i picked 2 srx818, one with one stx825 per side but the bass remain the same. I suppose because the stx825 have plenty of bass. With 2 srx818sp per side i will hear a difference or i want 3 per side?
Logged

Debbie Dunkley

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 4506
  • Central North Carolina
Re: JBL STX825 how many SRX81SP
« Reply #7 on: March 14, 2019, 10:41:01 am »

I am a wedding dj, the venus are about 500-600 people, inside and outside. I was ok with the stx825 without subs but i wanted more bass, i picked 2 srx818, one with one stx825 per side but the bass remain the same. I suppose because the stx825 have plenty of bass. With 2 srx818sp per side i will hear a difference or i want 3 per side?

You are asking a lot of the SRX818's if you only have one per side for each STX825 especially if you are pushing those STX825's.
2 subs per top would be a better ratio  for you to really benefit from the addition of subs to your system and 'feel' the bass as you say - even 3 or 4 subs per top depending on just how much low end you want.
This is a standard rule of thumb and does not just apply to the SRX/STX series.
Also consider the SRX828sp which is an amazing 2x18" sub that for the money cannot be beat. I own 2 x SRX818sp and 1 x SRX828sp and I love the scalability of the system.
Logged
A young child says to his mother, "Mom, when I grow up I'm going to be a musician." She replies, "Well honey, you know you can't do both."

Will Knight

  • Sr. Member
  • ****
  • Online Online
  • Posts: 250
Re: JBL STX825 how many SRX81SP
« Reply #8 on: March 14, 2019, 10:55:20 am »

You are asking a lot of the SRX818's if you only have one per side for each STX825 especially if you are pushing those STX825's.
2 subs per top would be a better ratio  for you to really benefit from the addition of subs to your system and 'feel' the bass as you say - even 3 or 4 subs per top depending on just how much low end you want.
This is a standard rule of thumb and does not just apply to the SRX/STX series.
Also consider the SRX828sp which is an amazing 2x18" sub that for the money cannot be beat. I own 2 x SRX818sp and 1 x SRX828sp and I love the scalability of the system.

^^^This right here. 

If you're looking for a balanced sound, you'll need to REDUCE the volume of the 825's and bring the 818's way up.  Apply a HPF @ 80-90Hz to the tops to smooth the transition to the sub.  That will sound much better but will not get you the chest thumping base you're expecting. 

Most importantly, heed Debbie's point.  You need 2x818's to 1 Top or at least 1 828 per side MINIMUM, particular for 500 ppl outdoors.
Logged

Kiriakidis Christos

  • Newbie
  • *
  • Offline Offline
  • Posts: 4
Re: JBL STX825 how many SRX81SP
« Reply #9 on: March 14, 2019, 04:01:50 pm »

Very fair enough, both of you. Thanks yor your answers.
 I may go to 1 srx828sp on one side and the 2 srx818sp which i have them already. I work on my own and i dont know how difficult to cary them.
Another question, i am thinking about why the srx 812p and srx815p have 2000 crown amp and the srx818sp have only 1000 crown amplification
Logged

Sean Zurbrick

  • Jr. Member
  • **
  • Offline Offline
  • Posts: 79
    • http://www.nextexitrocks.com
Re: JBL STX825 how many SRX81SP
« Reply #10 on: March 14, 2019, 05:02:01 pm »

While I agree you could have more subs per top box if you want a universal setup that will work outdoors, it seems odd that you have no noticeable increase in low end at all.

Are you using the crossover in the 6002 and your 818SP? If not that would be the first place I'd look. I see the 818SP can be crossed over as low as 60 Hz. Given your tops are double 15's, that's where I'd start.  I just can't tell from the Crown manual if the 6002 can be set lower than 90 Hz. It has a "custom" crossover function but I don't see any documentation on what that means. So if the amp will do it, experiment with 60-80 crossover setting. Being under-subbed in some situations, you may find this doesn't work all the time as you might get more mid-bass from your top boxes than low lows from 1 sub per side.

Another thing to check is that you aren't running the tops out of phase with the subs. That would have them fighting each other and cancelling out some of the low end. You also can get come cancellation if you're in phase but running full signal to the tops so they are duplicating the sub frequencies. Some setups play better with doing that than others.  Worst would be if you are doing both - full frequency tops and out of phase with the subs.

500-600 people is a big reception for sure, but as a guy that's done ~200 wedding receptions, there aren't many time I could have maxed out a 4 sub / 2 top system and kept everyone happy. When "dance time" starts I generally toe in the mains to focus on the dance floor and the system is running on cruise control, and that's with a live band. But outdoor is a different story, particularly on the low end.
« Last Edit: March 14, 2019, 07:26:16 pm by Sean Zurbrick »
Logged

Rick Powell

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 753
Re: JBL STX825 how many SRX81SP
« Reply #11 on: March 14, 2019, 06:28:48 pm »

Another question, i am thinking about why the srx 812p and srx815p have 2000 crown amp and the srx818sp have only 1000 crown amplification
1. I don't have experience but many times have been told that cranking up the gain on the SRX sp boxes is done by some people to offset the low gain sensitivity.
2. Maybe the higher wattage because they are dual amplifiers in the 812 and 815, electronic crossover between the speaker and the horn, and probably underutilizing the amp side that is going to the horn.
Logged

Scott Bolt

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 1331
Re: JBL STX825 how many SRX81SP
« Reply #12 on: March 15, 2019, 07:28:07 am »

While I agree you could have more subs per top box if you want a universal setup that will work outdoors, it seems odd that you have no noticeable increase in low end at all.

Are you using the crossover in the 6002 and your 818SP? If not that would be the first place I'd look. I see the 818SP can be crossed over as low as 60 Hz. Given your tops are double 15's, that's where I'd start.  I just can't tell from the Crown manual if the 6002 can be set lower than 90 Hz. It has a "custom" crossover function but I don't see any documentation on what that means. So if the amp will do it, experiment with 60-80 crossover setting. Being under-subbed in some situations, you may find this doesn't work all the time as you might get more mid-bass from your top boxes than low lows from 1 sub per side.

Another thing to check is that you aren't running the tops out of phase with the subs. That would have them fighting each other and cancelling out some of the low end. You also can get come cancellation if you're in phase but running full signal to the tops so they are duplicating the sub frequencies. Some setups play better with doing that than others.  Worst would be if you are doing both - full frequency tops and out of phase with the subs.

500-600 people is a big reception for sure, but as a guy that's done ~200 wedding receptions, there aren't many time I could have maxed out a 4 sub / 2 top system and kept everyone happy. When "dance time" starts I generally toe in the mains to focus on the dance floor and the system is running on cruise control, and that's with a live band. But outdoor is a different story, particularly on the low end.

Same here Sean.  Of course most weddings include some older people so you canít open up the system until later in the night.

I also donít see how there would be no difference in low end when adding two 18 subs.  I have a neighbor with a QSC system like this.  It thumps pretty hard.

To get the system balanced so the tops can be opened up for larger venues,  you will need 2X18 per side.  It is more expensive to use single 18ís for this; however, you can carry it much easier and it allows for scaling down for a smaller venue
Logged

Will Knight

  • Sr. Member
  • ****
  • Online Online
  • Posts: 250
Re: JBL STX825 how many SRX81SP
« Reply #13 on: March 15, 2019, 05:11:20 pm »

Hello to everyone
I own 2 jbl stx825 amplified with 1 crown xti6002, i recently owned 2 srx818sp.
The bass from the subs is very little in comparison the bass from the stx. How many srx818sp i must have to have correct system audio output? To feel the bass from the srx818sp's

You have not said yet how you're connecting these units to your mixer (and what type of mixer)?  Are you going direct?  Using Aux Sends for the Subs? using a Loudspeaker Processor?  What are the attenuator settings on the Amp? 818's? There's only 1dB difference in Max SPL between the STX825 and SRX818SP at Peak (NOT watts). Depending on your crossover settings and whether you have a SubSynth enable (it should be OFF), you should notice a difference with the 818's.  But as been mentioned already, if you can handle the size, get 1 828 and use it along with the 2 818's.   
Logged

Glen Hansen

  • Newbie
  • *
  • Offline Offline
  • Posts: 12
Re: JBL STX825 how many SRX81SP
« Reply #14 on: March 15, 2019, 10:09:59 pm »

Logged
Pages: 1 2 [All]   Go Up
 


Page created in 0.068 seconds with 21 queries.