• TalkBass has been independent since 1998. Add your voice.
    Create a free account to reply to discussions, view embedded media, and browse with fewer display ads.
    Join free Log in
    Want zero display ads or expanded classifieds tools? Compare plans.

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

#121
Italian brand Acus Sound Engineering, Sito web ufficiale,Official web site has in their catalogue an interesting 3-channel bass/DB/cello combo: One forBass
It folds a 10" High Excursion woofer
"Each channel also features of separate Volume and BSS Filter (High-Pass) to have the maximum control on sound. " but I can't find the freq. range and the slope.

oneforstringsrightbass-05-p-web2.jpg
 
  • Like
Reactions: Phaidrus and Passinwind
#126
Adding a couple of amps to the list. I've had this confirmed by tech support at both Orange and Ashdown, and have scoped the ABM to confirm it.

Ashdown's ABM series has a steep HPF as standard, it starts to work at around 30hz. I was only told that the ABM that has the HPF, but haven't had a MAG or RM series amp to test.

All of Orange's bass amps (and the new Bass Butler preamp) have a steep HPF which starts to cut at 30hz. Includes everything from the crush range to the big heads.

I don't know what order (db/octave) they are but they are described as steep and the purpose is to filter out subsonics without interfering with your sound /tone. It is hard to scope & measure accurately down below 30z, but it does look like a steep drop off on the ABM, so my guess (and that's all it is) would be that it is at least 18db/oct.
 
  • Like
Reactions: Stumbo and dabis
#127
agedhorse said:
HPF included:
Genz Benz
Series 1 (~12dB/oct)
Series 2 (~12dB/oct)
GBE-250
GBE-500
GBE-400
GBE-600
NEOX-400
GBE-750
GBE-1200
NeoPak-3.5
Shuttle 3.0
Shuttle 6.0/6.2
Shuttle 9.0/9.2
ShuttleMax 6.0/12.0
ShuttleMax 9.2/12.2
Streamliner 600
Streamliner 900
Contour 500

Mesa Boogie
Subway D-800
Subway D-800+ (adjustable)
Subway Pre-DI pedal
Rosette 300 (adjustable)
Rosette Pre-DI pedal (adjustable)

(As you can see, I've been a fan of HPFs for a very long time ;) )
Click to expand...

I was shopping for a similar HPF than what i use for my upright and came across this thread.. I did not know that! Since I pretty much gig with either a Shuttlemax 9.2 or Streamliner, I guess I can save my cash! Or.. reappropriate it to other "needs", at least ;)
 
  • Like
Reactions: agedhorse, S-Bigbottom, dabis and 1 other person
#134
scottfeldstein said: [URL="https://www.talkbass.com/threads/hpf-lpf-list-which-do-you-use-or-know-about.1360424/goto/post?id=21692671#post-21692671" said:
↑[/URL]
Really? Like right after my tuner? I would have thought otherwise. Like what if my effects add back in a boatload of low frequencies that I don't want? Or what if the HPF signal doesn't trigger my effects in the same way it used to? Maybe I'm worried for nothing?

"agedhorse, post: 21692763, member: 68399"]Generally it's beneficial, assuming the input impedance is high enough (~1M)
Click to expand...

Resurrecting this discussion, I have a question I haven't seen asked, but I can't imagine it has already been asked somewhere (and maybe it's a dumb question):

Would it be possible to add a passive variable HPF to the bass guitar circuitry that would be just as effective as these active pedals?
 
#135
I use a simple EQ based cab sim in my "amp-less" setup, which, in lack of a dedicated LPF/HPF pedal, consists of one of the bass specific 2 band fully parametric equalizer models in my Zoom MS-70CDR multi stomp box, set to [12kHz Q=1 Cut=-18dB ; 20kHz Q=0.5 Cut=-20dB], which effectively functions as a LPF set to a cut off point of approximately 3.5kHz with an approximately -12dB/Oct slope, and then the build in fixed @ 40Hz -12dB/Oct HPF of my ART Tube MP Project Series tube preamp.
 
#136
danyosound said:
Resurrecting this discussion, I have a question I haven't seen asked, but I can't imagine it has already been asked somewhere (and maybe it's a dumb question):

Would it be possible to add a passive variable HPF to the bass guitar circuitry that would be just as effective as these active pedals?
Click to expand...
No, not even close IMO.
 
  • Like
Reactions: GrapeBass and Passinwind
#137
Preamps such as this BAE 1084 have a HPF. It’s a Neve clone with wider tonal control over the classic Neve 1073. The HPF is passive using capacitors inductors and resistors.

3 Band Equaliser
HF:+/-16dB fixed frequency shelving at 10kHz, 12kHz and 16kHz
LF: +/-16dB shelving with selectable frequencies of 35Hz, 60Hz, 110Hz & 220Hz
MF: +/-18dB peaking, fixed 'Q' with, selectable centre frequencies of 0.36kHz, 0.7kHz, 1.6kHz, 3.2kHz, 4.8kHz & 7.2kHz

High Pass Filter
45Hz, 70Hz, 160Hz & 360Hz

Low Pass Filter
6kHz, 8kHz, 10kHz, 14kHz, & 18kHz

A4E67E03-4E1A-4CA7-B49C-1C2E8D70D614.jpeg


BAE 1084

AMS-Neve produces similar products. A number of other companies make similar Neve clones that sound good, one is AML.

Invalid Link Removed

AML kits are available here:

AML Kits

Another excellent kit company. Well engineered.

[Invalid or Expired Link Removed]
 
Last edited:
  • Like
Reactions: MarkA
#138
Note that while the HPF appears passive, it’s very dependent on the low impedance active stage before it and the high impedance active stage following it.

Also, that’s a very expensive way to do a filter if you want to do it well, the inductor is not a cheap part and for many applications it needs to be a shielded part too.
 
  • Like
Reactions: MarkA
#139
Yes, pre and post conditioning circuits are sometimes needed. Cost is very high. There are engineering challenges in these old designs. There are certainly easier ways to implement a -18dB/octave filter. But there’s something about the sound quality of these type of Neve based products that I like.

[Invalid or Expired Link Removed]

Technical documents: [Invalid or Expired Link Removed]
EQ schematics here: [Invalid or Expired Link Removed]

https://carnhill.co.uk/products/classic-audio-transformers-and-inductors/
 
Last edited:
  • Like
Reactions: MarkA

Latest posts

Top Bottom
Back