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8030A with 7050B - bass roll-off

davidc, modified 11 Years ago.

8030A with 7050B - bass roll-off

Youngling Posts: 4 Join Date: 3/18/12 Recent Posts
A stupid question coiming up but here goes -

I am using the 8030A with a 7050B - I have as advised in the manual switched on the bass roll-off filter on the 8030As. What I don't understand is why the high pass filtering is at 85Hz - as the 8030As go down to 55Hz why doesn't the 7050B just take over for frequencies below 55Hz?

ilkka-rissanen, modified 11 Years ago.

Re: 8030A with 7050B - bass roll-off

Yoda Posts: 2564 Join Date: 3/23/09 Recent Posts
Hey David,

Remember what they say about stupid questions. :)

Crossover filter is set to 85 Hz for various reasons.

1) We want our subwoofers to work with a range of different main speakers, in the case of 7050B: 8020B and 8030A. Since those speakers have different LF cut-off frequencies, the crossover point needs to be above the LF cut-off of the smaller speaker, i.e. 8020B.

2) Having the high pass filter at 85 Hz, the speaker works better and gives better sound quality because it doesn't need to produce low bass frequencies. Amplifier power of the woofer amp is reserved for the very important mid bass and midrange instead of the low bass which is now handled by the subwoofer which is designed to produce those frequencies with high sound quality.

3) THX standard recommends an 80 Hz crossover for a multichannel home theatre system.

4) Studies show that with an 85 Hz crossover the subwoofer is not yet (audibly) locatable as it would be with a higher crossover frequency.