New ways to save

0% up to 48 Months on over 110 Brands!

New & Current Vintage King Card Holders

$ 999 .00
No interest if paid in full within 12 months Learn more
Ships directly from Demeter Amplification
Note: This item may not be returnable or could require a restocking fee. Contact one of our Audio Consultants for more details. This item ships directly to you from the manufacturer. To ensure that the manufacturer currently has stock, please chat, call or email for the latest availability status.



Demeter Amplification HBP-1 Bass Preamp/EQ

800 watt amplifier, driven by Jensen transformers into the HBP-1 preamplifier circuit

Product Description

The Demeter Amplification HBP-1 Bass Preamp/EQ uses the same all tube front end found in his classic VTBP-201 Bass pre-amplifier and combines it with the revolutionary H Series circuitry found in his professional audio H Series line. This preamplifier provides the best of both the tube and solid state world. It features high voltage (250 V) tube front end (providing all of the preamplifier gain and passive tone controls), a two band solid state fully parametric equalizer that is tuned for bass, a fully adjustable active effects loop with controls up front, a tuner output, a full balanced output with switchable mic or line level, both a balanced TRS line level output and an unbalanced line level output for amplifier connections and a mute switch. As with all Demeter equipment, it is meticulously hand-wired using the finest components and assembled in the U.S.A.


  • Input impedance: >1 megohm
  • Minimum load impedance: 600o hms
  • Maximum output: + 24 dBV @ 600 ohms + 28 dB
  • Gain: Adjustable to + 10 dB Mid 440 Hz to 4 kHz
  • EQ gain : + or -15 dB
  • Signal to noise ratio: - 80 dB
  • THD : 0.5%
  • Frequency response : 10 Hz to 40 kHz
  • Tube: 1-12AX7a selected
  • Parametric EQ: Q or width continuously variable Low 40 Hz to 440 Hz Mid 440 Hz to 4.4 kHz
  • Inputs: 1/4" (passive and active)
  • Outputs: 3-pin balanced mic/line, TT, XLR & 1/4"
  • Chassis: Single space rack
  • Operating voltage: 115/230 V AC switchable
  • Power supply: 250 V fully regulated
  • Filament: 12.6 V fully regulated

Product Specifications

Condition New
Input Connectors 1/4-inch TS
Output Connectors 1/4-inch TRS, Analog XLR

Product Reviews

5 out of 5 stars.
Review Count (2)

write a review

Fantastic sound! I have played bass for over 55 years and have never heard such a rich, deep, full-bodied sound that this unit has. Thanks to Brett for great service too! Demeter accidently shipped me their Real Reverb unit; I plugged it in and it's also staying with me! The separate delay on the left/right had me a bit sceptical at first, but it lends itself to a fantastic stereo spread. The folks at Demeter really have figured out what musicians think they need!! Now if they would drop a tube into that reverb unit...

By Greg Z on January 24, 2023

I’ve never been so happy with my ability to find a tone and a volume to match the way my 6 String Bass feels!
My Audio Engineers are extremely happy with the Jenson output transformers!

By Vincent H on November 14, 2021

* Required Fields

Share Your Opinion

The best gear advice always comes from those who use it the most. That's where you come in! Let the pro audio world hear your voice with a review of the Demeter Amplification HBP-1 Bass Preamp/EQ . Once you submit your review, please check your email and verify your address to have it posted.

How do you rate this product?
I would like to thank VK for the wonderful sales assistance, service and prices. This was my first purchase with you and it won't be my last. I only wish I'd discovered you years ago!
Matthew R.
I had two Grammy wins this year - Ray LaMontagne & Carolina Chocolate Drops. Both made with help from Vintage King!
Ryan F.
In almost 20 years in Pro audio buying, never did I receive a unit so well packed and exactly as described. Works flawlessly. The whole process has been so smooth. I will never hesitate to do business with you guys in the future and will recommend you to everyone I know.
Martin C.
This was my first experience buying something from Vintage King (although I surf the "used" categories on the website frequently!), and, despite being on the other side of the world, I had absolutely no trouble and everything went very smoothly.
Phil T.
The speed of delivery exceeded my expectations! I was VERY pleased that my shipment arrived in time for a scheduled vocal tracking session. The packing insured that my order arrived safely. And the sales staff responded quickly to questions regarding the product.
James P.
Thank you so much! Vintage King has been so fair and easy to work with. I can't thank you enough. It feels good to trust such a hefty purchase to folks who are so helpful and knowledgeable. Vintage King is a sound designers dream store.
Noa L.
You guys have excellent customer service and I am excited about the next upgrade I complete on my fifth recording facility. I've been in the studio business for forty plus years. The salesman I worked with at Vintage King was the best of the best. You all rock!
Robby T.
I would recommend Vintage King to any one looking for top-class gear, unbeatable customer service and the best prices on the map!
Jake D.
My experience with Vintage King was excellent. The order was here fast considering it was out of stock. The sales person had SKB send it to me directly and I couldn't have been more pleased.
Michael D.
From the minute I placed my order I was kept well-informed through each step in your process. Even though I was buying a comparatively modest piece of gear, your attention to detail made me feel like I was purchasing a six-figure mixing desk.
Thomas W.
I am a new customer of yours. You guys provided me the absolute best deals in ordering all the equipment to power my brand new recording studio. Your customer service is amazing and i will always deal with you from here on out.
Rob M.
Thanks for your great service and getting this out today. You guys really are the Kings!
Alan B.
Better than expected! Truly impeccable service. Your team was professional, knowledgeable, provided speedy delivery above and beyond standard. Vintage King Audio is definitely my go to for all of my audio and information needs.
James O.