Not to rehash old topics about if they should be used, but where do I get my hands on something to do the job without breaking the bank, or going crazy with a calculator and soldering iron.

I'm looking at trying out a few different DIY vented cabinets for HT use and have concerns about low end tuning toasting a driver in the process. Looking at some of the possible setups, different vent configs in WinISD, I see a lot of room to do damage if my boxes get much below 15-17hz range...

What are my options for a highpass filter? Subs are passive, stand alone amps have regular lowpass x-overs but no highpass.

What's available off the shelf? Honestly, for someone who has zero experience at real electronics (busting out the capacitors, resistors, board and solder) what a DIY guy to do?

Any and all ideas are welcome..

Thanks,

Greg

What are my options for a highpass filter?


Passive or active line-level cross-overs.


What's available off the shelf?


FMODS are a commercial passive offering.


Honestly, for someone who has zero experience at real electronics (busting out the capacitors, resistors, board and solder) what a DIY guy to do?


If you can build a speaker or sub-woofer, you can figure out the electronics.

Passive:
http://sound.westhost.com/linkwitz-transform.htm#power
Active:
http://www.linkwitzlab.com/filters.htm

The active filters require a power supply but have no insertion loss, present a high purely resistive impedance so you don't get frequency response aberations, etc.

Not to rehash old topics about if they should be used

http://www.avsforum.com/avs-vb/showthread.php?t=746810

http://www.avsforum.com/avs-vb/showthread.php?t=754977

Here are the old topics i think you are talking about, read through both and you should find your answers.

Read post #34 in the second thread above. This is the only thing that will be out there that i am aware of.

BR

Early next year we will have the Reckhorn B-1 available:

Bob
Creative Sound Solutions

Thanks Drew... Guess I'm still not 100% sure what I want. Was originally thinking of passive, due to the $ I had seen for some off the shelf actives in my searching previously. I'll go through those links again, as I know I still have plenty to learn in this area... Admittedly I'm driven by cost and effort. I'll pay more for less effort, and put out more effort for less cost, but both are a factor for me.

Yes, those were the threads that I had gone through, and saw that they kinda came to an end without a resolution. What I gather is that we are all still waiting. Just seems odd that there would still be a bit of gap in this area after all these years, but as said, most people who are willing to build a speaker/sub are willing to do the electronics work as well. I just haven't gotten into that yet, and my time is still limited...

Bob, I look forward to hearing more about that as well.

I'll sit back and wait patiently and keep my eyes and ears open... And keep some money aside in case I get carried away with my own creations and need to rebuild some drivers... :eek:

Thanks for the replies...

Bob, just took a closer look at the manual on that... Nice... That would definitely address some my needs, as I'm sure it would for many other that are caught between the DIY setups, and the higher cost Velodyne type active bass management solutions...

Any hints on possible pricing? ;)

http://www.avsforum.com/avs-vb/showthread.php?t=746810

http://www.avsforum.com/avs-vb/showthread.php?t=754977

Here are the old topics i think you are talking about, read through both and you should find your answers.

Read post #34 in the second thread above. This is the only thing that will be out there that i am aware of.

BR

I am the guy who has been puttering around trying to build a low cost hi quality hi pass filter. I have found it very hard to do for my target price point of less than $50.00. My goals are to make it adjustable with modules for a range of 10 to 20 Hz, have a phase control, and offer balanced and unbalanced outputs. The parts cost is very small, EXCEPT for a decent bipolar power supply. For DIY in small quantities a decent transformer kills you. And I can't find an off the shelf bipolar supplier with + - 15 volt output, so at the moment I am still thinking. I have built some protoypes and they work well, but I am stuck on the power supply. So good luck, let me know what you find. For someone in the "business" I believe there is a niche market out there.

Chuck

I'll have a couple of samples for testing in the next 2 weeks.

Projected price is $69 plus shipping.

Bob

Early next year we will have the Reckhorn B-1 available:

Bob
Creative Sound Solutions

Any info on that one, Bob? Sorry if I missed it on the site...

It's not available yet other than samples so I haven't put it on my site yet. Since I'm new here I can't do an active link yet so you'll have to go to reckhorn(dot)com and download the manual for the details. I expect to have inventory in February.

Bob

That actually looks pretty good. :D

B-1
Highpass selectable from 10-150hz at 24db/octave.
0-12db boost selectable from 20-120hz
Optional lowpass from 50-150hz
RCA inputs and outputs.
Trim control

It could be a very nice little box indeed. ;)

That actually looks pretty good. :D

B-1
Highpass selectable from 10-150hz at 24db/octave.
0-12db boost selectable from 20-120hz
Optional lowpass from 50-150hz
RCA inputs and outputs.
Trim control

It could be a very nice little box indeed. ;)
Yup, looks like exactly what people are looking for and $69 sounds reasonable especially given its other functions.

http://reckhorn.com/graphics/b1/B1front.jpg

Wow. This is exactly what I've been looking for. Let me know if you need any volunteer testers ;).

Early next year we will have the Reckhorn B-1 available:

Bob
Creative Sound Solutions

Sir Bob, that price point does look good. Sign me up!

I'd be in for one at that plus the oversea's shipping, assuming it's coming out of Germany, right?

Keep us posted...

- Greg

Some pretty nifty features for only $69. I'll have to look into one of these whenever I build my next sub.

:)

Greg,

No, I will be stocking them here in Canada so it will be Fed Ex from here. There may also be a black version available. I will have the A-400s (both colours) as well as a couple of F-1 samples on Monday.

Bob

Hate to be a newbie here but can't the same things be done with BFD (http://www.hometheatershack.com/forums/bfdguide/) ?

Not the 24dB/oct high-pass adjustable down to 10hz...which is what people are mainly interested in.

One thing that looks like it could be quite a challenge would be nailing an exact HP frequency under 20Hz, where the vast majority here would set it. The range from 10-20hz takes up a very small part of the range of control. I'd much rather the control have a range from, say, 10-25Hz, in detented increments, although I realize this unit is not just for subs.

Think this will give the bassis a run for the money?

Hate to be a newbie here but can't the same things be done with BFD (http://www.hometheatershack.com/forums/bfdguide/) ?Sure if you want the roll-off to start at 20Hz. The BFD isn't a crossover, but one can sort of create quasi-shelving filters with it.
Think this will give the bassis a run for the money?Probably not since the bassis is a LT circuit and the Reckhorn is simple cut/boost combined with a crossver

Think this will give the bassis a run for the money?
For sealed boxes the BASSIS is the better unit because it has greater flexibility in adjustment to match the driver box combo.

Hey Bob- are these still set to be available in Feb? If so, will it be early Feb? Mark me down as interested.

Greg,

No, I will be stocking them here in Canada so it will be Fed Ex from here. There may also be a black version available. I will have the A-400s (both colours) as well as a couple of F-1 samples on Monday.

Bob

Not the 24dB/oct high-pass adjustable down to 10hz...which is what people are mainly interested in.

I am on the verge of having initial prototypes done and being tested.

Chuck

Well hurry up, we're getting tired of waiting ..... :D

I am looking foward to this. Not so much as i think i actually will need it but sounds like it will be a fun project. :cool:

These for sale yet??? lol

I can't read german :(

The device I am building is just waiting on circuit boards. Prototypes have been built and are actively being used. Should be less than a month, hopefully sooner. You will be able to build all 3 sections of the project, high pass, phase, balanced output or just the section that you need.

Chuck