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Mackie SRM-450 System - Page 7 Questions & Answers
Humming speakers
If you disconnect the signal leads and the hum is away, it's probably a groundloop problem, or your equipment is generating the hum.
If it does not go away, the amps are defective
Humming problem
This could be a grounding problem, it might change if you plug it in elsewhere or it might be where you live.
Blowing woofer
hi. manage to put celestion in but not the same.have to do till get right one .not sure where to get one all u.s.a made.thanks anyway.
I have Mackie srm 450 original the speaker
When it goes off, try pressing gently on the speaker membrane (you'll probably need to remove the protective mesh to do that).
If the speaker comes on for an instant or so when you press the membrane, then the cause is a broken braid wire at the back of the speaker (it goes from the connection terminal on the speaker itself to the speaker cone where it is connected to the speaker coil wire and glued to the cone to keep it firmly in place).
If this turns out to be the case, the braid can be resoldered at the point where it is damaged / broken (you need good soldering skills to do it, also the braid needs to be cleaned well which is a bit tricky because of its structure, and solder won't stick to it well if it's not clean).
The solder point should be firm, but as small and short as possible because the braid needs to remain flexible at all times since it moves when the speaker is operating.
An alternative to braid resoldering is to replace the speaker, but there may be speaker repair shops around where you can get it fixed.
The problem may as well be something else, the above is just one of the things that you can check and possibly fix by yourself.
Regards
3rq8 (Triarcuate)
Drivers burn
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There is crackling coming from the horn as soon as
The horn speaker is wearing out. Inside speakers, there is a magnet, the speaker part is attached to a cone that slides over the magnet, They tend to make crackling noises. Try very gently to apply pressure to the horn and then release. If you hear a scratching sound, the horn will need to be replaced
How to change the hf unit?
a new diaphragm can be fitted into the original driver and the speaker will be like brand new. first you must determine if you have the older RCF version (M44TI) or the newer Mackie versions (0008093). There is only one RCF diaphragm that will work for this repair and they are scarce. There are both authentic and aftermarket Mackie diaphragm options and both work very well.
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Mackie srm-450 constant annoying hum (buzzing) even with no input plugged in
Mix, try this...Get everything in your audio system together.get a coupla power strips. Power up both speakers on that strip with no inputs, just the speakers. gotta hum(60hz)? ground-lift the strip and see if it stops. add one peice of the puzzle at a time until you find your buzz generator, if you're a mobile DJ, doing gigs in 'God Knows Where' you would be well advised to buy a "Power Conditioner" that will level out spikes and dips in the voltage servicing your gear.
Loss of power & clarity
Do they sound good at low level? If so i would suspect the drivers may be a bit smoked.Some drivers will still work after being overheated but exhibit a lowered impedance to the driving amp and do all sorts of bad things including possibly burning up the driving amp.If they are still under warranty,bring them back and tell them they better check them out again cause your 12 year old cousin can tell they are in distress and if they still can't find anyhting wrong maybe you can get him a job.But seriously,give them the smell test.Put your schnozz near the center of the woofer cone, then tweeter center to see if you detect any burnt smell at all.even a little bit can be a clue that there is a big prob.Next step is to remove the suspect from the case and give it a feel.while you are doing this,give the amp circuitry a quick visual for anything burnt or obviously dammaged.The smell test is really good for the amps as they get REALLY smelly when they are in trouble.Try to gently move the cone inward and then outward.NOT hard enough to damage it but what you are looking for is any slight drag or uneven cone movement like a slight scraping.If you have another decent speaker that is similar in size(not really necessary) and quality(i consider this very necessary),try the substitute to see if you are on the right track.What we are trying to do is narrow the prob down to the actives(amp/crossover circuitry) or passive(actual speaker mechanisms).Actives need a tech.Passives need you to get a replacement speaker and install it yourself.may be just a woof or maybe a woof and a tweet or whatever.remember,you need to listen closely(this is a mental process) to decide if what you hear(physical process) is good audio.Take it from there Sparky!This process is good for any active speaker.
I own a pair of
You'll need to get a power adaptor, that's about all you can do.
SRM 450 Mackie
1)Clean the heat sinks on the amp on the back of the speaker,
2) carefully remove the amp from the rear of the cabinet and look for 'crispy critters' on the circuit board. If you see 'um, either take the amp to a service center, or go to your dealer and get him to order you a new one.
3) if you're goin' thermal, either get higher powered speakers, or tune it back a bit with these. I have a set that has run years in a dance room with no problems. If you are stretching the system to cover a bigger audience, think about another pair.
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