Iron Age Audioworks LH95 Manuel utilisateur
User’s Manual
LH95 Inductor Equalizer
Thank you for your purchase of an Iron Age LH95 Equalizer. Iron Age Audioworks is a small
team of engineers and designers and we truly appreciate your business. We hope you enjoy
using this as much as we enjoyed making it.
Safety
Safety with audio equipment is normally a matter of common sense, but we want to make sure
you get the best use out of your equipment. So please, use common sense including...
●Use typical practices for using electrical and audio equipment.
●Don’t clean this with water or use it around water.
●Any ventilation openings in the case need to remain open.
●Don’t use this around anything that’s hot (such as a radiator or space heater).
●Don’t defeat the ground pin on the plug or use a ground-lift device that does.
●Don’t use a cut or damaged power cord, and keep the cord from getting pinched or
stepped on.
●Don’t service the box unless you’re a qualified technician.
Power
The unit is compatible with any VPR compliant 500 series rack.
© 2020 by IronAgeAudioworks 1
Overview
The Iron Age LH95 is a highly flexible, discrete class A active equalizer in the 500 series format.
It features a discrete audio path, three vintage class A gain blocks, transformer balanced inputs
and outputs, and an inductor mid band.
Block Diagram
The equalizer is set up for broad, musical adjustments on the high and low end of the audio
band with an active Baxandall stage. The high and low bands allow for up to 15 dB of shelving
boost or cut in 3 dB increments, at 40 Hz for bass and 15 kHz for treble.
The mid band stage is a variable frequency presence filter using a custom-wound multitap
inductor from Cinemag. It provides up to 8 dB of boost or cut in 2 dB increments. Boost and
cut frequencies are approximately mirror-inverted.
Additionally, the EQ features switchable high pass and low pass filters with -3 dB points at 75
Hz and 13.5 kHz.
Controls
The IN/OUT button switches the EQ in when depressed. When the unit is not in, a true bypass
circuit is engaged, connecting the channel input directly to the output with no other
components in the signal path. When the EQ is engaged, the LED over the switch is
illuminated.
© 2020 by IronAgeAudioworks 2
The treble and bass EQ bands have identical controls. The amount
of boost or cut is selected by the 11 position gain switch.
The presence band has a frequency selection switch and a gain
switch. The amount of boost or cut is selected by the 9 position
gain switch, and the center frequency is selected by the 6 position
gain switch.
The HPF and LPF switches are each two position toggles which
engage the filters.
Technical Specifications
Gain Range+/-15 dB, bass and treble in 3 dB increments
+/-8 dB, presence in 2 dB increments
Maximum Input Level +18 dBu
Maximum Output Level +21 dBu
Input Impedance approx. 5.6kOhms, transformer balanced
Output Impedance <45 Ohms, transformer balanced
Frequency Response, set flat +/-0.5 dB 40 Hz - 16 kHz
Noise <-85 dBA
THD @ +15 dBu output <1% typical
Power Consumption approx. 90 mA
© 2020 by IronAgeAudioworks 3
Frequency Response
Frequency response plots generated from actual data measured from LH95 production unit.
High Band
Mid Band
© 2020 by IronAgeAudioworks 4
Low Band
Low Cut Filter
© 2020 by IronAgeAudioworks 5
High Cut Filter
© 2020 by IronAgeAudioworks 6
Warranty
We warrant this product to be free from defects of materials and workmanship for a period of
one (1) year from the date of purchase. We will remedy any defect identified within this period
by repairing or replacing the product at our option. It will be your responsibility to pay for
shipping the product to us, and if the product is determined to be defective, our responsibility
to pay for shipping the product back to you.
LIMITATIONS AND EXCLUSIONS. This warranty, and any other express or implied warranty,
does not apply to any product which has been improperly installed, subjected to usage for
which the product was not designed, misused or abused, damaged during shipping, or which
has been altered or modified in any way. This warranty is extended to the original purchaser
only. THIS EXPRESS, LIMITED WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES,
EXPRESS OR IMPLIED, TO THE EXTENT ALLOWED UNDER APPLICABLE STATE LAW. IN NO
EVENT SHALL IRON AGE AUDIOWORKS BE LIABLE FOR ANY SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES RESULTING FROM THE USE OF THIS PRODUCT.
If you suspect a defect in this product, please contact us to discuss the problem (it is possible
that a suspected defect could be quickly remedied or due to improper usage).
Call or email us with any issues, to say hi, or share the music you’ve made. We love this gear
and want you to love it too.
© 2020 by IronAgeAudioworks 7
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