HPF/LPF list- which do you use or know about?

[agedhorse]

Question: I have an Ampeg SVT3 Pro that has a parametric eq... Wouldn't cutting the lows at 33hz -12db (max cut) effectively be the same as a HPF? It seems that I've seen one or two of the hpf's mentioned here cutting to -12db anyway. Would that not work? (Or ANY parametric eq for that matter, pedal or amp based.)

It's not the same, the slope is typically shallower and unlike a true shelf, a bandpass filter (like what you are describing) affects the signal equally on both sides of the center point.

 

[Passinwind]

Question: I have an Ampeg SVT3 Pro that has a parametric eq... Wouldn't cutting the lows at 33hz -12db (max cut) effectively be the same as a HPF? It seems that I've seen one or two of the hpf's mentioned here cutting to -12db anyway.

The HPFs you seen referenced actually roll off at a slope of 12dB per octave, not 12dB max cut.

This graph set won't quite answer your question about using a PEQ, but it'll at least give you a general idea: High Pass Filter (HPF) and Low Pass Filter (LPF) Mega Thread

 

[dabis]

MESA/Boogie®

"Incorporating the most powerful design elements from the Subway D800+, the new Subway+ DI-Preamp gives you virtually all the gain and level control, tone shaping–including a 2-Band semi-parametric MID and interface potential of our most popular Subway D800+ Bass amplifier in a compact DI box that’s hand-built MESA tough.

Variable High-Pass Filter (30Hz – 125Hz)."

 

[Steve Dallman]

I've built a few...not hard, and I wanted higher headroom. I was going to build one into my PF-500, but found it offered little improvement. (Mine was 36db/octave @ 30Hz.) In our band, we use a trigger on the kick, triggering a nice kick model in an Alesis drum box. I run that through a Peavey Kosmos. I experimented with that HPF on the output of the Kosmos (which has an octave below which I use) and it worked wonders...without changing the sound...just the sub frequency excursion of the speaker. I then put it in the Kosmos hardwired to the sub output.

I use HPF's a lot. I have a few electric guitars with Fishman Power Bridges and the vibrato ones thump loudly. A HPF greatly diminishes the thump while retaining the acoustic low end. I Either use an Fdeck or one of my steeper DIY's.

 

[Zbysek]

In search for a perfect HPF for myself, I made a list of preamps/DIs which include the HPF function. Let me share it with you. I am leaving dedicated HPFs (FDeck, Broughton, Vong, Thumpinator) aside.

Variable HPF:

• Radial AC-Driver
• Radial PZ-DI
• Fishman Platinum Stage Pro
• Broughton Messenger
• Mesa Rosette
• Mesa Subway Plus preamp
• Grace Felix/Alix
• Acoustic Image Flex

Switchable HPF:

• Fishman Platinum Stage
• Tech 21 Q strip
• Radial Tonebone PZ-Deluxe
• Radial Tonebone PZ Pre
• Radial Bassbonbe V2
• Radial Bassbone OD

 

[agedhorse]

Fixed HPF: original Subway Pre-DI

 

[Zbysek]

Fixed HPF: original Subway Pre-DI

Can you, please let us know the frequency and slope? Thank you

 

[agedhorse]

24dB/octave, about 30Hz

 

[Zbysek]

24dB/octave, about 30Hz

Thank you.

 

[dabis]

Invalid Link Removed

"The HPF and LPF give added control over the frequency spectrum whether you’re going direct with your bass, guitar, fiddle...or even a vocal. The Q\Strip is limited only by how far you are willing to push your creativity and how much of that juicy vintage tone you crave."
"HPF High Pass Filter. Filters out rumble and low frequency artifacts of certain instruments or vocal mics that emit unintelligible rumble. Preset point at 45 Hz; attenuated at 12dB per octave. Engaged (in position), frequencies below the preset point are attenuated at 12dB per octave.
LPF Low Pass Filter. Preset point at 3 kHz; attenuated at 12dB per octave. Engaged (in position), frequencies above the preset point are attenuated at 12dB peroctave."

 

[Zbysek]

Below, I am sharing a reply re slope of filters on AC-Driver and PZ-DI from Radial Eng.:

"The Low-Cut control on the AC-Driver features a single order 6dB/octave high pass filter, with a variable range from 0Hz-300Hz. The Lo-Cut control on the PZ-DI features a 2nd order high pass filter with a slope of 12dB/octave, with a variable range from 5Hz-500Hz"

 

[Dynacord]

Another user of the Broughton Audio HPF/LPF, adjustable pedal. Love it - very useful.

Also the F-deck.

Previously used the Fishman Dual Parametric DI which was not a real HPF/LPF but was able to achieve similar function - really useful box for upright IMO. (Does require AC power.)

Also in the 'sort of' category, a Stellartone pedal which is a LPF in as much as tone pots are - but with greater variability. Kind of cool that it's passive and requires no power at all.

 

[Chris Y]

The only effect I have is a Zoom B3n, it has a filter update called Low EQ with variable HPF 20-640htz, it works ok but you need to add it to each patch or sound as required, bit of a PITA.
Might need to get a Broughton always on I think.
Can't get F-Deck in the lucky country

 

[Zbysek]

There is new HPF DI from Broughton...

Invalid Link Removed

 

[dabis]

You can like him or not, but you can't acuse Doug Pinnick to not have a brutal yet defined tone. Maybe this head has something involved:
Invalid Link Removed

Don't know how it works, but the buttons are marked like this:
HPF: 200Hz-2000Hz
LPF: 100Hz-1000Hz
From the owner's manual:
"HPF: dUg traditionally used graphic EQ to eliminate all frequencies under 700 Hz. ThisHigh Pass Filter, calibrated at a standard -3dB drop, yields dUg’s preferred setting ataround 1200 Hz.
LPF:Low Pass Filter, corner frequency drop -3dB. For dUg, the preferred LPF setting is between 200-400 Hz. Note: When solely in the Bottom channel, LPF is bypassed"

 

[dabis]

EDM-1 | Headway Music Audio | Mini preamp for Life on the road

• Tuneable “Range” control for extended range of attack on unwanted boom, body handling noise and feedback to amplify a clearer, more musical tone of instrument.
RANGE CONTROL – LOWEST TONES & ROLL OFF POINT
Bass Guitar/Double Bass (E) = 40 Hz
Baritone Guitar (B) = 60 Hz
Cello (C) = 65 Hz
D Guitar (D Tuning) = 70 Hz
Acoustic Guitar (E) = 80 Hz
Bouzouki (Celtic/G)
Octave Mandolin/Mandola = 100 Hz
Tenor Guitar (A) = 110 Hz
Viola/Tenor Mandola = 130 Hz
Violin/Mandolin (G) = 200 Hz
Uke (Soprano/A) = 210 Hz
Rock Acoustic = 300 Hz

ROCK ACOUSTIC If you need to amplify an acoustic guitar over a loud electric band especially where using stage monitor speakers, there may be little or no point trying to amplify the bass end of that acoustic instrument since it could be drowned out by Electric Bass Guitar and Bass Drum and may be trying to feedback at lower volume levels than where an acoustic guitar is likely to be audible. The Rock Acoustic setting allows the shimmer of Acoustic Guitar Chords with a limited lower frequency content to deliver a useful sound with a minimum possibility of feedback.Guitar: This setting is also the recommended starting point for the following Instruments with standard “E” tunings: 12 String, Electric and Nylon Strung Guitars, Resophonic Guitars and Lap Steel Guitars.
BASS: This setting applies to all instruments producing Bass such as Double Bass.

 

[Plutonium244]

F Deck.

 

[dabis]

Just surfing randomly today on usual sites from where I get info an found that Schalltechnik 04 is releasing a new DIY kit of an HPF, 12dB/octave slope, 30-140Hz.
You can ask the builder directly, as he's a talkbasser: @lazarus_04

MINI-HP-VONG – Schalltechnik_04

 

[lazarus_04]

Thanks @dabis the English version of the instructions is online now

In a few days there will also be a MINI-LP-VONG featuring a LPF (-12dB/octave slope, .250-22kHz).

 

[dabis]

Off topic: I absolutely recommend the lockdown diary Leland Sklar is doing on YT: Leland Sklar

I can't find anyone here who posted about HOME - Euphonic Audio
[Invalid or Expired Link Removed]: HPF switch at the front. Don't know the settings, can't find the manual online

[Invalid or Expired Link Removed] : It isn't very clear to me how are the settings, per the manual I think that are: 2 internal 3 positions slide switches, (one for each channel): 25Hz-50Hz-80Hz, 6db per octave slope.

I think @Mike Arnopol knows exactly how these two work and the exact specs. of the HPF's