How to use REW with an usual shaped room

[Anthony Mark Long]

1. Hi
   
   Just purchased a UMIK-1 MiniDSP microphone and downloaded the latest REW v5.20 Beta 7 for my Mac.
   
   I'm a complete novice and would appreciate some guidance on what settings to use on the REW, to position my ATC speakers.
   
   I am not using a subwoofer, so just need to measure the front pair of speakers alone.
   
   These are ATC Scm40A (active) 3-way speakers;
   
   Drivers: HF ATC 25mm dual suspension Tweeter, Mid 75mm ATC Soft Dome, LF ATC 164mm SC
   Matched Response: ±0.5dB
   Frequency Response (-6dB): 48Hz-22kHz
   Dispersion: ±80° Coherent Horizontal, ±10° Coherent Vertical
   Max SPL: 112dB
   Crossover Frequencies: 380Hz & 3.5kHz
   Connectors: Male XLR
   Input sensitivity : 1V
   Filters : 4th Order critically damped with phase compensation.
   Overload Protection : Active FET momentary gain reduction.
   Fault Protection : DC fault protection and thermal trip. Fault indication on rear panel mounted LED.
   Amplifier Output: 150W LF, 60W MF, 32W HF
   Cabinet Dimensions (HxWxD): 980 x 370 x 344mm (inc. foot plinth & amp, spikes add 25mm to height, grill adds 34mm to depth)
   Weight: 36kg
   
   In New Zealand, house designs are somewhat unusual ...... it isn't a rectangle and is more akin to being a right angled triangle, with a high sloping roof ....... I said it's weird - but I guess there is no way to replicate this in the software.
   
   Apologies for the decor, we are undergoing some renovations
   
   Cheers
   
   Mark
   
   
   
   
   
   
   
   
   

 

[John Mulcahy]

Not seeing the images, but odd room shape just means using measurement rather than starting with the room simulator. If you want to see what different speaker and listening positions look like a quick way is to play the generator's Pink Periodic full range noise signal with a length of 64k and watch the frequency response on the RTA using these settings:

You can move the mic to different listening positions to see how the response changes and try moving the speakers to different positions. The main area of interest is the region below about 500 Hz. Make sure the signal is playing at a comfortable level, it doesn't need to be loud.

 

[Anthony Mark Long]

Hope these images give you an idea about the odd the shape

The room 'shape' in the REW software allows for standard square and rectangular rooms ("Room Sim") and the dimensions can be altered .... but I can't see a way to create an almost triangle shape, as per my room.

Also, under the Room Sim, there seems to be a way to enter speaker specifications ("Crossover frequency") and I wondered what details I should enter, based on the specs of my ATC's listed in my first post.

Hopefully, thee will be a way around my 'unusual' circumstances

 

[John Mulcahy]

The room 'shape' in the REW software allows for standard square and rectangular rooms ("Room Sim") and the dimensions can be altered .... but I can't see a way to create an almost triangle shape, as per my room.

You can't, just make measurements and follow the general guidance in the info that comes with the speakers.

 

[tesseract]

Wow, that is a cool room, @Anthony Mark Long .

Good luck with your REW journey, that'll help dial things in for you.

 

[Tonto]

Well, I like the room personally. All rooms are different, we use what we have. As such, measure from the listening position and see what you get. Let us know.