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Post by desmoface on Mar 12, 2017 20:21:32 GMT -5
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
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Post by beardedalbatross on Mar 12, 2017 23:00:03 GMT -5
Nope, unfortunately not. This is a feature I would love too. It's actually the reason I have moved away from the PT-100 myself.
If you're a bit savvy then you can try a MiniDSP 2x4 and set that up with high and low pass filters. This adds an additional Analog to Digital and back to Analog conversion.
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Post by desmoface on Mar 13, 2017 7:33:57 GMT -5
Ahh..well that's too bad; Have you found a preamp that has this capability? Thanks for the reply. Steve Edit: It looks like this preamp would work albeit a bit pricey: Parasound 2100 |
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Post by kybourbon on Mar 13, 2017 10:29:11 GMT -5
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Post by Boomzilla on Mar 13, 2017 11:17:36 GMT -5
Need a preamp with (analog) bass-management? The Emotiva XSP-1 does that.
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Post by desmoface on Mar 13, 2017 11:57:46 GMT -5
Need a preamp with (analog) bass-management? The Emotiva XSP-1 does that. Ahh...$1200 places it out of my budget, unfortunately. Steve |
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Post by Boomzilla on Mar 13, 2017 11:59:41 GMT -5
Hi Steve - Used ones are available for a lot less...
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Post by cgramer on Mar 13, 2017 12:04:58 GMT -5
I'll be getting the PT-100/A-300 combo soon, too, and plan to use the Hsu Research High Pass Filter box between them: www.hsuresearch.com/products/high-pass-filter.htmlFront:  Back:  It's not pretty to look at, but it's small and it'll get the job done. (And yes, the box in the image says "Bass Optimizer." I guess they modify their Bass Optimizer box for HPF use. See the description on the site.) I also plan to pair the PT-100/A-300 with a Hsu HB-1 MK2/ULS-15 MK2 2.1 package. Can't wait.  Cheers! Chris |
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Post by desmoface on Mar 13, 2017 12:08:38 GMT -5
I'll be getting the PT-100/A-300 combo soon, too, and plan to use the Hsu Research High Pass Filter box between them: www.hsuresearch.com/products/high-pass-filter.htmlI also plan to pair the PT-100/A-300 with a Hsu HB-1 MK2/ULS-15 MK2 2.1 package. Can't wait. See, I knew I came to the right place. I never knew anybody made such a device. Thanks cgramer and definitely let us know how your like your new equipment. Steve |
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Post by cgramer on Mar 13, 2017 12:14:11 GMT -5
Will do! :-) Glad to help. I updated my post with photos, etc.
Chris
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Post by kybourbon on Mar 13, 2017 14:21:16 GMT -5
I'll be getting the PT-100/A-300 combo soon, too, and plan to use the Hsu Research High Pass Filter box between them: www.hsuresearch.com/products/high-pass-filter.htmlFront: Back: It's not pretty to look at, but it's small and it'll get the job done. (And yes, the box in the image says "Bass Optimizer." I guess they modify their Bass Optimizer box for HPF use. See the description on the site.) I also plan to pair the PT-100/A-300 with a Hsu HB-1 MK2/ULS-15 MK2 2.1 package. Can't wait. Cheers! Chris Very very interesting. I didn't know this existed. Very cool that they let you select your crossover points. What would you all recommend for cut off options for the Ascend Sierra-2? |
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Post by vcautokid on Mar 13, 2017 18:43:42 GMT -5
Kind of a left turn, but a good one I think. Maybe an MC-700. Darn good, and with bass management, and not a huge price either. Maybe a good way to go.
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Post by Axis on Mar 13, 2017 19:58:39 GMT -5
The Emersa preamps were supposed to have bass management. I believe a preset sub/satellite crossover. What 60, 80 and 120 ? Would that work ?
Both the Emotiva XSP-1 and USP-1 preamps have excellent bass management that allows you to adjust the crossover manually. I do not want to hear that the USP-1 did not work with your home theater system. Tough luck because it works beautiful for me in my two channel system and it is a two channel analog preamp. You pay the extra for the XSP-1 for better integration with your home theater system.
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Post by rvsixer on Mar 13, 2017 21:46:42 GMT -5
The HSU highpass/lowbass boxes (either bass optimizer+high pass combo, or high end crossover) can become expensive, and inflexible in that you have to buy extra modules if you want to change xover(and then you still can't effectively time align the subs either).
MiniDSP 2x4HD allows complete flexibility in this regard at same/reduced cost (I have the standard MiniDSP 2x4 and only use it for bass duties due to its gain structure issues, but the 2x4HD takes care of that and reports are that it is stellar, I am buying one if my new to me XSP-1's lack of time alignment is an issue).
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Post by leonski on Mar 14, 2017 1:56:56 GMT -5
For straight crossover function, the Parasound P5 is tops. High pass? Low Pass? Front panel sub level control? Single ended AND balanced outs? Crossover defeat switch position? ALL YES.
Time align? Sorry, for that you'll need one of the DSP solutions, perhaps the MiniDSP 2x4HD which is a very flexible device and can also implement FIR filters. FIR filters have NO phase shift thru the passband. This makes time align much easier, but complicates crossover setup.
rvsixer mentions 'gain structure issues' with the standard 2x4? Well, I think that's been fixed with the HD revision.
Even better, if want to go to true biamp, would be the 2x8 which has balanced I/O as well as single ended but is in 'kit' form which means you need to figure some things out for yourself.
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Post by Boomzilla on Mar 14, 2017 8:43:11 GMT -5
And an aside for anyone using jRiver Media Player software - There are crossovers built into the jRiver DSP studio. The user can specify both the crossover frequency and the slope. This removes the necessity for a physical crossover.
That same DSP studio also offers TWO parametric equalizers. The user can set the center frequency, the boost or cut, and the kurtosis of the curve (the Q). Curiously, more peaked curves are achieved with higher Q numbers. A Q of 1.4 provides approximately a one-octave bandwidth. I've boosted the natural roll-off of my ported speakers by 3 dB at 8 Hz. below the normal roll-off. At this frequency, the ports still load the woofers, and the effect is identical (to my ears) of having well-integrated subwoofers operating. Because my speakers are efficient, and my amplifier robust, I can get away with 2x the midband power demand in the bass. You can easily damage speakers or amps, however, if you get over-enthusiastic with the parametric equalizer, so be sure you understand power demand and the mechanics of port tuning before trying to go wild with the software equalizer.
Just a FYI for jRiver users...
Boom
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Post by leonski on Mar 14, 2017 15:19:27 GMT -5
Crossover frequency for this type of device is dependent on input and output impedance. |
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Post by monkumonku on Mar 14, 2017 15:26:08 GMT -5
Crossover frequency for this type of device is dependent on input and output impedance. If so, then why do they sell items with different colored bands that denote the crossover frequency? Is that because the stated frequencies are good within a certain range of impedances? Reason I ask is that I have the 70 hz high pass filters. I noticed that if I use them between my Schitt Saga preamp and Bob Latino ST-120 amp, when I switch between passive and active (tube) mode on the Saga, there is a noticeable difference in the volume, with tube mode being louder. If I take off the filters, there is no volume difference between passive and active mode. Is that because the filters interact with the two different preamp outputs in a different way for each one? |
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Post by leonski on Mar 14, 2017 19:16:20 GMT -5
First, if these are simple Series or Parallel Capacitors, they ae 6db per octave. So, if the knee is at 70hz, they are only 6db down at 140 hz. Not exactly a Brick Wall. there is a tolerance involved, too, of course. www.audioasylum.com/cgi/vt.mpl?f=amp&m=172870Look down the page linked to the answer by BWB. His calculation looks real straightforward. As one cynic put it, if you can't do the math, go find an 8th grader! That's probably what I'd end up doing, too. If you know the capacitance AND the input impedance, it should be easy to figure out the REAL crossover frequency. I suspect it is fairly close to the advertised frequency. I'd start by contacting the manufacturer of the widget. If they are 'stuck' on 70hz, they are not being 100% forthcoming. |
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Post by rvsixer on Mar 14, 2017 21:14:25 GMT -5
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.
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