Professional 2.5 KW PA System and all extras for sale - aberdeen-music

Flash@TMB · 11-01-2004, 20:55

2 x vintage H&H 1200W power amps - £750 each.

Two speaker stacks, each consists of 2 cabs:

top cab
JBL horn
2 x 15" JBL mid drivers

base cab
1 x 18" JBL bass driver

The cabs are carpeted plywood with foam lined heavy steel mesh grills. They are to all intents and purposes indestructable. When errected each stack stands over 6 feet (1.8meters) tall.

The cabs and speaker drivers were recently serviced by Taylored Sound and the system was only used on 6 occasions since.

£1500 total for both stacks

3 way active crossover switch with peak limiter - £150

Behringer Virtualiser Pro effects unit - £50

Behringer Composer Pro compressor, limiter, expander, gate unit - £50

Behringer Ultragraph 2 x 32 band graphic equaliser including spectrum analyser with mic and pink noise generator - £250

Yamaha 2 x 24 band graphic equaliser - £100

Spirit 24 channel mixing desk (yes twenty four channels), all preamped with direct outputs and in-outs on all channels. 6 aux ports - £1000

1 x Peavey 100 watts per channel monitor amp
2 x Peavey 100 watt monitor wedges
£300 total for both the above

1 x flight case standard rack with wheels - £50

Also:

2 x Seinheiser vocal mics - £50 each
4 x spot mics - £20 each
4 x overhead condenser mics - £20 each
2 x kick drum mics - £20 each

various boom mic stands (very tatty) - £5 each

At 2.5KW this system is more than twice as powerful as that commonly employed by local touring bands. It is large enough to play virtually any bar type venue of up to 100 people.

This PA is ruggedised and of industrial strength. It is a professional system and at a level above anything you'll see in the shops.

If you want to buy the lot then £4000. All cables to wire the above together are included. The only thing not included is mic leads.

Anyone that attended The Moorings Bar in 2003 has probably heard this rig. You'll also see similar JBL stacks installed in several other venues in Aberdeen and elsewhere.

All components deinstalled and available for collection NOW.

Flash

12-01-2004, 02:05

fucking hardcore like

betamax · 16-01-2004, 12:12

i can vouch for the quality of said PA....it sounds fantastic

soundian · 17-01-2004, 14:23

25K in the Moorings! How will people hear the bands in Drakes?

Tav · 17-01-2004, 14:36

They prob. won't?

GraemeC · 17-01-2004, 15:16

25k????????????? you are kidding!

That would be fine for the Music Hall......

Can you imagine the insurance claim if the punters got an accidental millisecond of full power....

hearing aid anyone?

G...

Tav · 17-01-2004, 15:21

I suppose it just means they can have good sound with all the knobs at only 2?

Flash@TMB · 17-01-2004, 21:24

Power ratings don't indicate volume the same way as they used to. Back in the jurrasic period you got 1K, 2.5K, 5K, 15K rigs etc. Everything was pretty standard and the technology was geared towards dynamics as opposed to quality. Some people still tend to think along those lines.

Also take into account that a 5K rig is NOT 2x as loud as a 2.5K rig! Power requirements increase exponentially with volume. If you draw a graph with volume in dB as the x axis and power as the y axis then the curve will tighten upwards towards the vertical. It actually takes 10x the power to reach 2x the volume! If we just wanted to increase the volume then the easy solution is more speakers as opposed to more power, because more speakers move more air!

Power is simply there to increase the quality of the sound. An amp is rarely outputing anything like full power. So in some ways RMS is more relevevant than peak. Peak power is there to prevent distortion. Distortion will hurt peoples ears far sooner than volume. Distortion makes your ears ring. Distortion also blows speakers. A speaker will happily recieve slightly too much clean power without blowing. Problems occur when you use an amp that's too SMALL for the speakers.

The other consideration is impedance. You need an amp that can deliver clean peak power to speakers. If the amp is rated at 4KW, that probably means 4KW at 4ohms. If the speakers are 16 ohm impedance then (correct me if I'm wrong Ian) the same amp will only be able to deliver 1KW of power to those speakers. So if the speakers have a peak requirement of 4KW then the amp is far too small and will distort when it tries to cough up the speakers peak power requriement, probably damaging or blowing the speaker with 'dirty power'.

Some of the speakers we are using are rated at 16 ohms, considered to be high impedance therefore we need powerful amps.

So the huge power is really about quality rather than volume.

In order to address our volume requirements we are using more speakers than before. This system will have 6 horns, 8 mids, and 4 bass speakers. This breaks down as each main speaker stack has a horn, a high mid, a low mid, and a double bass bin. The double bass bins are located down on the floor underneath the front of the stage. Further down the room we have 2 delay speakers each of those has 2 horns and 2 mids. The bass happily makes it down the room on it's own, its only the high and mid that we have problems with due to the length of the room compared with height of the ceiling.

Another benefit of the high power is that we can run these huge speakers (each horn on the main stack is 50W at

hms, more than the total power on a cheap HiFi) at very low volumes. The bass bins are rated at 6KW each!!!This enables our jukebox to output through the PA system instead of installing another set of amps and speakers. 25KW in a bar as small as The Moorings = HiFi quality sound from the PA (obviously it's also high quality kit), and the ability to make very small controlled movements of very large speaker cones, thus undistorted sound at jukebox level volumes.

Another advantage of low distortion is that you can hear the person next to you speaking without them having to shout in your ear. You won't be able to hear someone a metre away though... This means that we can run the jukebox at a relatively high volume still allowing people to talk and order drinks, but keep everyone happy that they can hear the music properly.

Hope this explains.

Flash

Davey Boy · 18-01-2004, 00:40

thats it im getting ear plugs

with all these new "loud" PA systems my ears are gonna take a battering

GraemeC · 18-01-2004, 01:36

Quote:

Originally posted by Flash@TMB:
Power ratings don't indicate volume the same way as they used to. Back in the jurrasic period you got 1K, 2.5K, 5K, 15K rigs etc. Everything was pretty standard and the technology was geared towards dynamics as opposed to quality. Some people still tend to think along those lines.

Also take into account that a 5K rig is NOT 2x as loud as a 2.5K rig! Power requirements increase exponentially with volume. If you draw a graph with volume in dB as the x axis and power as the y axis then the curve will tighten upwards towards the vertical. It actually takes 10x the power to reach 2x the volume! If we just wanted to increase the volume then the easy solution is more speakers as opposed to more power, because more speakers move more air!

Power is simply there to increase the quality of the sound. An amp is rarely outputing anything like full power. So in some ways RMS is more relevevant than peak. Peak power is there to prevent distortion. Distortion will hurt peoples ears far sooner than volume. Distortion makes your ears ring. Distortion also blows speakers. A speaker will happily recieve slightly too much clean power without blowing. Problems occur when you use an amp that's too SMALL for the speakers.

The other consideration is impedance. You need an amp that can deliver clean peak power to speakers. If the amp is rated at 4KW, that probably means 4KW at 4ohms. If the speakers are 16 ohm impedance then (correct me if I'm wrong Ian) the same amp will only be able to deliver 1KW of power to those speakers. So if the speakers have a peak requirement of 4KW then the amp is far too small and will distort when it tries to cough up the speakers peak power requriement, probably damaging or blowing the speaker with 'dirty power'.

Some of the speakers we are using are rated at 16 ohms, considered to be high impedance therefore we need powerful amps.

So the huge power is really about quality rather than volume.

In order to address our volume requirements we are using more speakers than before. This system will have 6 horns, 8 mids, and 4 bass speakers. This breaks down as each main speaker stack has a horn, a high mid, a low mid, and a double bass bin. The double bass bins are located down on the floor underneath the front of the stage. Further down the room we have 2 delay speakers each of those has 2 horns and 2 mids. The bass happily makes it down the room on it's own, its only the high and mid that we have problems with due to the length of the room compared with height of the ceiling.

Another benefit of the high power is that we can run these huge speakers (each horn on the main stack is 50W at hms, more than the total power on a cheap HiFi) at very low volumes. The bass bins are rated at 6KW each!!!This enables our jukebox to output through the PA system instead of installing another set of amps and speakers. 25KW in a bar as small as The Moorings = HiFi quality sound from the PA (obviously it's also high quality kit), and the ability to make very small controlled movements of very large speaker cones, thus undistorted sound at jukebox level volumes.

Another advantage of low distortion is that you can hear the person next to you speaking without them having to shout in your ear. You won't be able to hear someone a metre away though... This means that we can run the jukebox at a relatively high volume still allowing people to talk and order drinks, but keep everyone happy that they can hear the music properly.

Hope this explains.

Flash

I'm cool with all that ...... but....... 25K....kinell!!