Activity Stream

When the weather here clears l will post some driver and system measurements with and with out EQ for illuminative purposes. Another application...

An extension of classic analogue EQ in the studio recording process is the selective addition of tonal colour. This is done using various techniques...

Hi Rob, That is exactly right. That’s why l think offering some preset EQ options that have been thought through carefully is possibility. The...

Earl, Thanks you for following up and taking the time to scan and post these PRO-NOTE publications for all of us to enjoy here in the forum. Some...

Hello Ian Just adding a little clarity. For Constant Directivity systems, think 4430 where the on and off axis response are very similar you would...

Thanks Earl for posting these. Rob:)

Riley Casey commented in another thread that some in built Eq in an active crossover can be quite useful. Without doing a deep dive into what EQ...

And the last one in my possession; :)

Issue 8 ( I went back to 200 dpi a couple of issues ago ) . Interesting ( to me ) is that the scans from the glossy paper issues ( 1 - 7 )...

It seems the old service manuals website does not exist anymore. It's sad. I'm looking for the schematic of the 3152 network (or crossover). Can...

the DOT3 brake fluid trick worked, my caps and resistors showed up, went with clarity csa for low range and Jantzen superior-z for mids/highs....

Issue 5; :)

Issue 4 ( Dec. 1971 ); :)

Here's Issue 3; :)

Okay, let's try 240 dpi; Auto down-sampling performed by this sites hosting software seems to work well ( it reduces file size something like...

Sorry for the late reply have been busy! but Thank you so much, I will try to call them!

Here's issue 7 at 200 dpi . :)

Here's Issue 6 at 150 dpi. Thanks for the help guys :)

So why are discrete operational amplifiers not more widely used in professional and consumer electronics. The answer they are used in premium...

In the previous post l discussed some of the performance limitations of monolithic opamps in audio applications. But this is not really new news....

I have seen some people upgrade the legacy JBL 5234/5235 active crossover with new monolithic opamps in the past. This is a good idea where the...

I've found that 150 DPI is about right when scanning for web posting.

My analogue crossover l have mentioned will use discrete operational amplifiers and low impedance design. The estimated cost ex works will be around...

Another problem arises. The monolithic op amp only has a small fraction of output current in class A. It therefore has to drive this load in class B....

The story does not end there. If your crossover has a rated noise level of -110 db then it’s connected to your power amp with a rated noise of...

After starting this post I did end up buying an Xilica XP-4080. I ended up parting out these speakers and building a pair of 4345 clones. I used the...

As a rule the noise level should be at least 70 db below the lowest signal level in normal operation. Not the manufacturers rated noise performance...

Hello Earl If you can scan them as Jpegs they should be small enough to post. Rob :)

One of the bug bears with using an active crossover is the issue of ground loops that can intrude as a hum or buzz. In most but not all cases this is...