My question relates to 200hz and below, in rew it is automatically checked to allow narrow band Q below 200hz. Am I right in saying that the lower in the frequency range you are the narrower the Q and the higher you are in the frequencies you desire a wider Q?
This information I have gathered from audio engineers/mixers would the same apply to the room?
This information I have gathered from audio engineers/mixers would the same apply to the room?
A narrow (high Q) or wide (low Q) filter may be used to equalize loudspeaker response at any frequency.
The Q of the filter should be chosen to match the Q of the response you want to correct.
High Q dips due to out-of phase response may not be correctable within the driver's linear range of operation.
Correcting a room's response with EQ is only possible at one point in the room, as the room's modal response can cause location related variations of 20dB or more. A boost "here" may result in a dip "there".
Optimum positioning of the subwoofers can minimize room variations.
If I understand the question, perhaps TruBassUK would consider that the spectrum is usually displayed on a logarithmic scale.
So steep EQ corrections with high q filters creates an abrupt phase reversal and should be avoided at all costs regardless of the frequency.
My suggestions are always the same before EQ where subwoofers are concerned…….location, location and location first. Multiple subs (3 or more) will take care of most peaks and nulls with a relatively benign response. Once accomplished, slight low Q adjustments or better yet, shelf filters will finalize the performance.
Thanks all for you comments there is a lot to play with there now, so I'm getting it right:
1. The Q should be the same as the dip or gain I'm trying to fix
2. Uncheck REWs narrow Q below 200hz and see if it can do it without them
3. Try and do it manually without rew doing an auto eq
4. Location is key, currently there is two um18-22 sealed in 4cuft boxes, one monolith sub, and one monolith plus sub.
I'll update with some new information regarding the setup tonight and some pics.
Finally is having different subwoofers a problem or is it purely room, as the monoliths will give the same graph as the um18-22 when placed in the spot as them.
1. The Q should be the same as the dip or gain I'm trying to fix
2. Uncheck REWs narrow Q below 200hz and see if it can do it without them
3. Try and do it manually without rew doing an auto eq
4. Location is key, currently there is two um18-22 sealed in 4cuft boxes, one monolith sub, and one monolith plus sub.
I'll update with some new information regarding the setup tonight and some pics.
Finally is having different subwoofers a problem or is it purely room, as the monoliths will give the same graph as the um18-22 when placed in the spot as them.
yeah......with 4 subs i doubt you'll need any equalization at all as the bass and room should be completely coupled so just hundreds of modes very low in amplitude instead of 2 or 4 massive modes............maybe a contour filter here or there. In some rooms. it can be extremely advantageous to flip the polarity on one of the subs............you lose some output but the response is incredibly smooth. For 2 channel high fidelity, i don't think there's a better system available than a 4 sub SWARM.