Pt-100 sub usage question?

[jlafrenz]

Mar 12, 2017 20:21:32 GMT -5 desmoface said:

Hello everyone,

After reading, researching, and reading some more, it sounds like the pt-100/a-300 is just what the doctor ordered.  I have a question regarding sub usage:  When using a sub, is there a way to set a high pass filter/cut the sub bass frequencies to the full range/left and right channels?  Thanks in advance for any advice.

Steve

What sub will you be using? You may be able to leverage the EQ in it to do what you want.

[beardedalbatross]

Figured I should add that SVS subs have high-passed filtered outputs at a fixed 80hz 12dB/octave. You can run RCA from your PT-100 into an SVS NSD-12 (for example) and then into your A300.

[KeithL]

Exactly.... they're quite nice little gadgets.

Each pair is pre-set to operate at one frequency - but they only cost about $29 a pair - and 12 dB/octave is plenty sharp enough.
Also, yes, they will have a slightly different response depending on the source and destination impedance - but it isn't that big a deal.

HOWEVER, if you want an equivalent with much more flexibility, that doesn't cost much more, then buy this one (you want the 2W-1 version):

www.hlabs.com/products/crossovers/index_files/Page384.htm

For $50 it has jumpers that let you select all sorts of different crossover and cutoff frequencies.
It's totally passive, so no noise and minimal distortion.

Mar 14, 2017 21:14:25 GMT -5 rvsixer said:

FMOD's are 12dB/octave. Mix and match to change target crossover frequency, slope, etc. Really like the concept if you KNOW exactly what target you are after, but I just can't bring myself to buy anything from an outfit that has you are going to hell links on their website.

You can make your own PLLXO crossovers pretty easily.

[leonski]

BINGO:

As far as the FMOD stuff? A 'traditional' 12db slope requires an inductor AND a capacitor. At least at the speaker level.
I wonder, now, exactly what is IN those little bullets?
I'll look to see if there is a way to do this all with capacitors and skip the coil.

A DIY PLLXO can be constructed in an Altoids Tin. Several Kits are also available for ACTIVE versions, one of which is from ESP. see link:

sound.whsites.net/project78.htm

Just a starting point.

The 'expensive' FMOD stuff doesn't do me any good.   They appear aimed at automotive users, and I need a crossover centerd at about 600hz.