The 73EQ JR is a fully featured Line Input module for the 500 Series.

It not only shares the 3-band Equalizer with his big brother, the Heritage Audio 73 80 Series, but also shares the same transformer coupled line preamp  and Class A transformer balanced output stage.

These facts make the 73EQ JR unique on its class, being able to capture a full transformer based, Class A sound without relying on external preamps.

The Equalizer features the same Baxandall type High and Low shelf found in the HA73 80 Series, with the addition of a high frequency selector switch. 4 different frequencies are possible instead of the fixed 12Khz one.

The mid band is the same exact dual inductor one, thick low and sweet high midrange boosts without becoming muddy or brittle.

The line preamp has a range of +6 to -20dB, allowing heavy eq boosts without overloading A/D converters.

Finally, special care has been taken with power handling, implementing internal +24v slow turn on regulation (about 20 seconds to reach full voltage). This makes your 73EQ JR independent of the rest of the slots and makes your lunchbox´s PSU happier.

• Input Impedance: 10 Kohms bridging, transformer balanced and floating.
• Output impedance: Less than 75 Ohms, transformer balanced and floating, to drive a 600 ohms load.
• Maximum output: Greater than +26dBu into 600 Ohms.
• THD: Less than 0.025% at 1Khz, less than 0.05% at 100Hz
• Maximum gain: 6 dB
• Power consumption: Less than 85 mA per rail at +-16VDC.

Sounds great on bass

Got it for my bass rig. I decided on it because I’ve tried HA 1073/500 earlier and was really impressed, but had only 1 space. It probably sounds as good as 1073/500 (I haven’t exactly A/B it, but as far as I remember) but has no pre-amp. Fat, polished, classy sound without vulgar or amateur character. It colors the bass just right for my taste. My rig is Neve 511 as pre (very clean) to HA 73EQ JR (coloring) in Empirical Labs EL500. I have to patch these 2 with cable, EL500’s link doesn’t work, I think because of 73EQ. EL500 goes to Empirical Labs EL8-X and it’s scary how good bass sounds! I had to exchange the first unit because it was defective, but Mark at Sweetwater helped with exchange and I’m very happy. Highly recommend.

Anonymous from Boston, ma on August 30, 2015

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