Timing Reference - Why do I get two impulses?

Calypso

Moderator
Staff member
Thread Starter
Joined
Jan 15, 2024
Messages
49
While trying to run measurements using one speaker as a timing reference, it appears that there is a second impulse being generated. Is this a setting or incorrect setup?
TwoImpluses.jpg
 
Last edited:

John Mulcahy

REW Author
Joined
Apr 3, 2017
Messages
7,403
Either both speakers are playing the measurement sweep or there is a very strong reflection.
 

Calypso

Moderator
Staff member
Thread Starter
Joined
Jan 15, 2024
Messages
49
Either both speakers are playing the measurement sweep or there is a very strong reflection.
Tracked it down to a reflection. Thanks. Used pillows behind the mic, remeasured, and voila.
 
Last edited:

darklight

Member
Joined
Apr 20, 2021
Messages
25
More  
Preamp, Processor or Receiver
Denon X6500H
Main Amp
Sherbourn 5/1500A
Front Speakers
Definitive Technology BP2002TL
Center Channel Speaker
CLR 2002
Surround Speakers
BPX2
Video Display Device
BenQ MH530 FHD

FargateOne

Member
Joined
Jun 5, 2017
Messages
223
More  
Preamp, Processor or Receiver
Rotel RSX-1562
Additional Amp
Bryston 3B3 for fronts mains
Universal / Blu-ray / CD Player
Cambridge CXU
Front Speakers
B&W 804 D2
Center Channel Speaker
B&W HTM4D2
Surround Speakers
B&W 705
Subwoofers
SVS PC-2000 and SVS PC-2000 Pro
Other Speakers or Equipment
10 PEQ filters/channel in receiver with REW
Video Display Device
Samsung UN55ES8000
Other Equipment
miniDSP 2x4 HD
One way I used is to put a narrow panel of a certain dimension (a cushion a pillow a small board) to block the signal in one direction (front left right side of the speaker then measure. If reflexion desappeared you know where to search. The othe way is more complicated and implies to find in the impulse measurement the time by which the reflexions is delayed and use the "wrope technique" to find it. But my english is too poor to explain it to you here. One here will do better.
 
Top Bottom