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Forum: General Discussion

Topic: amp question

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ok so have a crown xti4000 amp and a graphic equiliser running at the moment and all ok.thinking of linking crown amp to another 600watt amp for my bass bins.....question is will i loose any power from crown and equiliser ...
my bins ar 300watt peak 500 and speakers are fbt 700watt each side
 
Inviato Mon 06 Dec 10 @ 1:28 pm
Not sure what your doing, but if your just linking from one amp to another via xlr's and then running bass off one and tops off another then no your xti 4000 with handle as it is. Linking to another amp doesnt steel any power. Let me know if you want another xti 4000/fbt verve 15s bins
 
Yes you can but!

The additional amp may require a crossover between the XTi and its input. The crossover makes shure that the bass bins are fed the correct low frequency part of the audio signal.

Your XTi is already a very powerfull amp. If you can post information on the make model and tech spec's of your speakers it might be possible to runn the whole system from the XTi. It will cope with running 4 8Ohm speakers happily and can even manage 4 4Ohm units (with short heavy guage cable's.

As you know the XTi series have on board DSP's so if you wanted to use two of these they can be set up to run a main and a bass bin on each side of your rig. This has the advantage of keeping the speaker cable runs short and allowing the amp to deliver its maximum power to the speakers without loosing power in the cables.

Daz
 
No crossover required, the XTI can be set to send a low signal, use your first amp, whatever it is? for your tops and then link into the xti making sure that it's sending a low signal only (Use for bass).

600w is no good for bins, you need to use this amp with your tops and use the xti for bottoms! however you will be under powered still, remember I have the same tops and xti amps, you'll be on red light watch all night, I am with two xti 4000's.
 
so basically linking the second amp wil not give me more power ie xti for tops and smaller amp just for bottoms..........just dont want to push the soundcard in my pioneer djm5000 to much as id rather push my amps.
i dont use software for my xti just run as normal amp....
normally just use xti4000 with both tops and bins///just like knowing i have more power if i need it only ever flicked into red on xti twice i always respect my gear
 
What make and model subwoofers do you use? usually they are 4 ohms, do they have a built in crossover then if your running from one amp.

Just give me the make and model.

The config I suggested in my last post is the best way but it's still under powered believe it or not, it easy to set the xti up for low frequency only.

I can advice you on that however if your bins are 4 ohms and you have a built in crossover I would leave it at that, I have a pair of FBT Maxx 9s subs at 4 ohms and some FBT Hi maxx 40's at 8 ohms and run off a single xti 4000 and it's ok.
 
charlie mate i have only name of bins nothing else they are alto 300watt peak 600 watt.and as you know fbt verves 700 watt tops...
 
If you mixer has 1/4 inch outputs. They sell a 1/4 male to Two female 1/4. I used this many times to run two amps.
 
Sounds like your bins are somewhat under powered when run with 700W tops. If you drive them with a second XTi you may well fry the drivers.

Out of interest how mutch difference do you find they make when added to the tops?

The XTi 4000 can chuck out well over 1000 watts per channel so I would suggest that you stick with what you are doing now, unless of course you are prepaired to fork out for a more powerfull set of bins.

It would also be well worth your while to set the limmiter on the XTi's DSP. This will greatly reduce the chances of you clipping the amp (even by accident) You can set this via the front panel buttons so you dont need to hook up a computer.

Daz
 
All sounds good on paper Daz but actually 1200w per channel isn't a lot these days playing from mp3's and through soundcard, also how do you know that it's a true 1200w p/c and that Crown haven't exaggerated as all these digital amp manufactures do, reasoning being that I get the clip lights on in some venues and the subs aren't really kicking it.

Hence I don't use the limit feature
 
You make an interesting point there mate.
I have come across a fair number of amps (Digital and standard) that claim to output all manner of powers.
I was using the QSC plx2 series amps befor switching to the Crowns. I found that the Crowns needed a fair amount of pampering to get them to work at their full potential. They can however do what they say. To get the best out of them I ditch the stock power cords (They are pants) and use heavy gauge cable with a good quality plugtop and connector. On the output side I use 8 gauge speaker cables that are only 3mtrs long. The speaker cables make a huge difference as I found that even with standard heavy duty 10 mtr 13guage cables I was loosing alot of power just in the resistance of the cable. Several hundred watts in fact.

If our friend is using standard 16gauge 10 or 15 mtr cables he will be loosing some power in the transfer but my concern was that at only 300w each the drivers in his bins will be running fairly hard already so i didn't want to suggest he hit them up with the full output from an XTI 4000. However you do the numbers and even if Crown are a little generous with their figures 300 and 1000 plus would not be my first thought for a good relyable match.

Daz
 
Umm, well to get the power back I just went active again, lot less hastle.

Will report back in time.
 
mate i find a big difference when load bins to tops through xti....as ive said before i never over push any of my equipment...i use pioneer djm 5000 mixer soundcard and quality is brilliant..........
so what size bins do you guys use
 
Yes, that's because the ohm-age drops

Bins will be 4 and top 8, link them together and run from the same amp as you would use to run your 8ohm top alone and you will get more power from the amp.
 
Agree with you Charlie. Active units are getting so good now that for small to medium sized gigs they are just the job and less to set up means you get home sooner :-)

At the moment I am running the JBL JRX118S bins.
I use four of these driven by a pair of XTi4000's The JBLs are only rated at 350W RMS and 1000W music so like you I dont hammer them. I am using these with a set of four JBL JRX125 units driven by another pair of XTI 2000's, to do the full range part of the sound. As the 125's are twin 15s they produce a fair amount of bass on their own and the 118's just fill in and beef up the last little bit at the bottom.

All the speakers I am using are 4 ohm and each speaker has its own amp channel. The XTI's are (with very short cables) able to drive into 2 ohm systems but I find they work best at 4 and run fairly unstressed. Wish I could say the same for the venue manager when he gets his electricity bill tho LOL.

Daz
 
BTW Charlie if you are interested in getting rid of any Crowns, PM me a list of what you have.

Daz
 


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