HDE-250A

BASE VERSION

Base version

incl. mid/side matrix

Black front panel

Black body knobs, grey caps

Blue push button switches

Green shelving indicators

Potentiometers (center click @0dB)

12dB cut/boost range

External power supply unit included

Options

Transformer Option

Input: LUNDAHL LL1540 – they have a nice softening effect on the bass/lowmid frequency range. Signal looses some transient energy, but in a very pleasent way. If you aim for warm, smooth and „pillowish“ this helps a lot.

Output: CARNHILL VTB2281 – provides a very gentle rolloff towards bass and subs due to the interaction with the circuits output impedance. (see graph below). The good thing is that it´s perceived as more sparcle on top rather than less bass. Works great on mixes which seem a little too bass heavy.

Input and output Xformers are individualy switchable (hard relay bypass) from the frontpanel and insertion loss is compensated so there is no level change happening when switching the transformers in.

The transformers are placed inside the bypass loop but outside the mid/side matrix.



Stepped Potentiometers

Custom ALPHASTAT potentiometers, 41 clicks.

10 or 5dB cut/boost range to better play along with the steps (0.5dB or 0.25dB stepsize).

6dB range

From +/-12dB to +/-6dB reduced cut/boost range provides more control around the 0dB position. Custom front panel with 6dB lettering.

12/6dB range switches

Replaces the band on/off pushbutton switch in every band with a 3 position metall switch.

  • 12dB – off – 6dB Base version
  • 10dB – off – 5dB Stepped version

Output level controls

+/-10dB output gain knobs. 1/2dB steps. Placed directly after the EQ circuit but before the mid/side decoder so they control either left and right or mid & side level depending on if M/S is engaged.

It´s possible to combine the output level control with the transformer option or mid/side cue but not all 3 together due to limited space in the middlesection.

Mid/Side monitoring

Allows solo monitoring the mid or side portion of a stereo signal. The „Cue“ switch activates the monitoring, „M/S“ toggles between mid & side.

Front panel color

It’s possible to manufacture the face plate with a colored finish. Almost any RAL color is possible.

List of RAL colors

Knob & cap colors

Body

Caps

LED Colors

Push buttons

Status LEDs

Metal handles

8mm stainless steel

ELMA switches

ELMA A4 series rotary switches instead of potentiometers, stuffed with precision metal film resistors (920 resistors for 30 switches) to squeeze out the last bit of precision. This is a custom build with a turn around time of 7-9 weeks.

There are 2 advantages compared to stepped potentiometers:

  • Even higher precision and matching: Not only channel to channel, also even unit to unit.  Recall the same setting on another HDE-250 and be sure it sounds 100% the same.
  • Having control over stepsize: Stepped potentiometer come with a defined change in restance per step. Using switches, those resistance values per step can be determined by the actual resistors the rotary switch is stuffed with, so it is possible to precisely define every single step. This, for instance, allows for smaller gain steps around 0dB and become larger in the higher gain ranges or define custom frequency points.

Due to the different mechanical structure (frontpanel, circuitboard etc.) of the ELMA version it is not possible to upgrade/convert a potentiometer version to ELMA switches.

12/6 dB RANGE • ULTRAMARINE BLUE • X-FORMERS

ELMA SWITCHES • X-FORMERS

12/6 dB RANGE • MID/SIDE MONITORING (CUE)

OUTPUT LEVEL • STEPPED POTS - 5dB RANGE

STEPPED POTS - 10dB RANGE • X-FORMERS

6dB RANGE • STAINLESS STEEL HANDLES

12/6dB RANGE • X-FORMERS

Specs

Connectors

  • Input: 3pin Neutrik XLR, balanced, 20k Ohms
  • Output: 3pin Neutrik XLR, impedance balanced, 100 Ohms
  • Power: 5 pin Neutrik XLR

Power supply

  • 25 Watts external PSU
  • Primary voltage 230 or 115V/AC
  • Secondary voltage 24V/AC

Dimensions & weight

Weight

  • Base version 4,85 kg
  • w/ Xformer option installed 5,9 kg
  • Power supply 1,14 kg

Signal path

DC coupled, no coupling capacitors – servo regulated

Frequency Response

  • 1.8Hz – 414kHz (-3dB)
  • 3.0Hz – 188kHz (-0.5dB)

Mid/Side matrix engaged

  • 1.8Hz – 189kHz (-3dB)
  • 3.0Hz – 81kHz (-0.5dB)

X-fomer option engaged (Input and output xformers)

  • 7.0Hz – 106kHz (-3dB)

Bypass

The HDE-250 features a global hard relay bypass. It takes the entire EQ out of the signal path when switched „off“

The band on/off switches act (electrically) like the cut/boost knob is set to 0dB when switched „off“

Filters

  • Band 1: 15 – 820 Hz, shelf and bell
  • Band 2: 15 – 820 Hz
  • Band 3: 140 Hz – 8.2 kHz
  • Band 4: 440 Hz – 25kHz
  • Band 5: 440 Hz – 25kHz, shelf and bell

widest to tightest Q

widest Q, max boost

Low shelf@85Hz - Hi shelf@2.5kHz tilting

tightest Q, max cut/boost

widest to tightest Q @ 6dB cut

Buy

How & where?

If you´d like to purchase a HDE-250 please send me an email

Turnaound time

  • Base version: usually in stock
  • Custom units: 2-3 weeks
  • ELMA version: 8-9 weeks

Ordering a custom unit requires 50% deposit of estimated total and balance when the unit is finished.

Bankwire or Paypal accepted

Pricing

HDE-250 (Base version) 2190€
Transformer Option +450€
Stepped potentiometers (41 clicks) +215€
6dB cut/boost range (incl. custom front panel) 0 €
12/6dB range switches (12dB-off-6dB or 10dB-off-5dB) +195€
Mid/side cue +175€
Custom front panel color +95€
Custom knob/cap colors 0€
Custom push button colors 0€
Stainless steel handles +25€
Output level controls +185€
ELMA A4 series rotary switches instead of potentiometers +2600€

 

Prices excluding VAT and shipping. Effective 01/2020.

Orders from Germany or non business orders from inside the EU are subject to 19% German VAT

Shipping

Germany: DHL 15 – 23€

European Union: DHL 49 – 65€

For shipping outside the EU we strongly recommend UPS or Fedex since the running time is more predictable. 

North America: UPS around 165€ depending on exact location, running time usually 2-3days

South America: UPS or FedEx around 185€

Asia: please ask

Shipping costs vari a bit depending on total value and weight (xformer & ELMA option add extra weight)

Goods over 1000€ value and shipped outside the EU require ATLAS customs declaration so there will be a 1-2 days delay until we get the freight papers from customs and can ship the package.

© 2020 CUSTOM AUDIO GERMANY I IMPRESSUM