Can you get these? I don't like the smooth dial or roll off on amps, I want no power going below the closest box tune freqency. Why don't they make them with clicker adjustments so you know which frequency it's actually at? Are there 2k amps with that?

Good Question.. I think this is just another *I want a clear YES OR NO answer to my very complicated question about all my gear that I know very little about*

Life is not simple and there are no simple answers.. You are looking at a cutoff frequency in the 20-50 hz range. I can give you several reasons why a precise cuttof frequency setting may make you feel good but in real life may make no difference:

1: a 5-10 % variation in passive components will throw it off.
2: Even a DSP based high pass may not be perfectly on frequency just because of the way that DSP math is done.
3: Your bass controll on your deck will boost by several dB anyway. How many db that is not controllable.
4: different songs will have different amounts of bass anyway
5: You may not know the port tuning frequency precisely anyway and it will vary depending on air temperature, humidity and elevation above sea level.

__________________
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Montreal

New Car Project:
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MB C240 Stealth instal
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DLS Nobelium 6.2 active front
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RF Punch 600.5
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2 x Pioneer CD635 Active Xover
Polk MMC525 rear door

not sure if it's what you are looking for,but harrison labs f-mods come to mind.

I would look at picking up a Phoenix Gold Bass Cube or an Audio Control Epicenter. They do different things but both have infrasonic filters in them. The PG is set by a knob and the Epi with a chip. Quite often people lose or break the control knob for the Epicenter which renders it useless except for the infrasonic filter. Good way to pick one up cheap

An Audio Control 2XS 2way crossover is a good option as well. Cheap to buy used and uses chips to set the freq.

What do you mean by "uses chips to set the freq" Most electronic crossovers use OPamps in traditional circuits to do low pass-high-pass and band-pass response. Nothing new here. The units above seem to do that. These do not see to be DSP based products. I am sure DSP based products do exist.

Can you blow a tinsel playing below box tune?

if you exceed it's mechanical, or thermal limit you can damage or destroy anything. Below the port frequency the sub becomes unloaded (no air pressure to restrict movement). Only the sub's suspension (surround, spiders, etc..) keep the sub in control. If you drive it with too much power, it will over excurt and damage itself mechanically. If you apply too much power over too long a period, the voice coil and tinsel could blow, melt, burn etc...at any frequency.

They do not use a stack of potentiometers to set frequency. Frequency is set using resistors on a chip. They offer a variety of premade frequencies or you can make your own. AC 2XS Owners Manual

these guys have click style dials:

http://www.exilecaraudio.com/products/