Room simulation - Page 5 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #41 of 70 Old 07-08-14, 05:55 PM
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Are the orientations of the sub's different? The distances are to the acoustic centre, which is near the front (where the arc is). The sub's can be rotated by right clicking on them.
Thanks for your reply John. I don't know wether my computer was having a bit of a strange moment the other night but I started the programme up again last night and all seemed to be displaying correctly now. Oh well....the joys of modern technology I guess.....!!

Thanks go your input anyway. It's a great piece of software in my opinion.

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Giovanni
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post #42 of 70 Old 12-21-14, 07:13 AM
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Re: Room simulation

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You can find a handy list of typical data. Absorption varies with frequency, but the simulation uses a single figure for its whole frequency range so you'll need to pick the figure for the range of interest.
I think it's more realistic and easier if you calculate the average alpha using T60 and the Sabine equation:
Avgalpha=0,16*V/(SS*T60)
where:
V: volume (m3)
SS: Sum of the surfaces (m2)
T60: RT averaged as in ISO 3382 (s)

Jose
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post #43 of 70 Old 12-22-14, 07:06 AM
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Re: Room simulation

By the way, I posted how to use the REW room simulator for dipoles in my blog but I can't include links. If anyone is interested I can send it in a private message.
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post #44 of 70 Old 01-04-15, 11:28 AM
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Re: Room simulation

Thanks for providing the room simulator as many members find it a useful tool

Is there anywhere that explains the "Time Align Speakers and Subs " feature?
i.e. do you add or subtract the time align ms to those already presented in speaker distances "from mains"?
Would be neat to have the distance required along with the time align ms.

Thanks in advance
Andy
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post #45 of 70 Old 01-04-15, 01:44 PM Thread Starter
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Re: Room simulation

Time alignment behaves the same as it does in a processor, all sources are delayed to have the same delay as the one that is furthest away.
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post #46 of 70 Old 01-04-15, 01:51 PM
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Re: Room simulation

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Time alignment behaves the same as it does in a processor, all sources are delayed to have the same delay as the one that is furthest away.
Hi John
At the risk of sounding dumb but wouldn't that mean in a Home cinema all speakers distances would be set at the same distance as the furthest speaker, even if the surrounds are much closer i.e. a sub in a front right corner being the furthest?
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post #47 of 70 Old 01-04-15, 01:53 PM Thread Starter
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Re: Room simulation

No, because the distance settings are used by the processor to work out how much it needs to delay the nearer speakers to arrive at the same time as the furthest. After it applies the delay the effect is as if all speakers were at the same distance though, which is what is required.
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post #48 of 70 Old 02-18-15, 12:11 AM
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Re: Room simulation

Could we apply a speaker frequency response measurement (nearfield) of a speaker to the computed room response (same goes for subwoofer) so that overall response can be predicted?
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post #49 of 70 Old 02-18-15, 12:37 PM Thread Starter
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Re: Room simulation

Can't apply a measurement, but can adjust the LF -3dB point and enclosure type settings for the subs and speakers to reflect their approximate low frequency performance.
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post #50 of 70 Old 02-20-15, 01:17 AM
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Thanks John. Love the simulation. Not for finding out the sub locations that will give the best frequency response but for getting a better understanding of how sub placement changes the response.

I do have one question though for REW. When it creates EQ, does it take into account regions that are at min phase and the regions that are not at min phase? In other words, does it ignore non-min phase regions before deciding on EQ curves?
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