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[James Chong]

I am handling the live sound for our church in Malaysia.
Our church not big scale with regular around 120 people.
The hall we rent can consist 200+ people.

We are using 1 pair of full range speaker to power the hall.
But the problem I am facing is due to the hall shape which
is rectangular in size.
The depth of the hall is around 3 times the
length and with a low celling and fully carpet.

The sound is too loud for the front audience and soft
for the audience at the back.
I was thinking to get another pair of speaker to setup at
the middle of the hall but other than that is there any
technique to overcome the problem?

Your advice is highly appreciated.

James

[Tom Young]

That is often the most sensible and practical way to achieve better front-to-back coverage (consistant levels). Just make sure you delay the new ldspkrs to the primary ldspkrs so that they are not fighting one another.

[Greg Hertfelder]

Rooms with low ceilings are difficult. What it really calls for is a cluster + distributed system.

The cluster provides a wide bandwidth source that ears are drawn towards, and the distributed speakers disseminate equal sound pressure level throughout the room. Like Tom said, the distributed speakers (typically 8" co-axial in a sealed enclosure, like these, or a surface-mount enclosures like these) need to be electronically delayed from the cluster, about every 20' feet, so that the sound from each distributed speaker is synchronized with the acoustic signal coming from the cluster. (These speakers provide a great deal of intelligibility for speech, but limited bass response.)

So, if your space is 80' deep, then it would have 4 distributed speaker zones. The 1st zone would not have any delay. The 2nd zone would be delayed approximately 20ms (milliseconds). The 3rd zone would be delayed approximately 40ms, and the 4th zone would be delayed 60ms. Each zone requires its own power amplifier. While you could probably buy all the components and eventually install a system like this, most of these components are not available to the consumer, and I recommend working with a contractor.

[ProSoundWeb Community]