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Dahlquist DQ-LP1 Crossover Variable Low Pass Filter

SKU 770054
In stock
Product Details
Item Description
Comes with a custom made power source. The Dahlquist DQ-LP1 is a unique line-level crossover which combines an electronic lowpass filter with a completely passive high filter. The LP1 is intended primarily for integrating 1 or 2 subwoofers into an otherwise full range loudspeaker system. It may also be used in the bi-amplification of a single loudspeaker system where the crossover point is from 40 to 400Hz. As with other electronic crossovers, the LP1 is connected between the preamplifier and the two power amplifiers; one amplifier feeds the main speaker, the other drives the subwoofer(s). (Please note: The LP1 requires the use of a second power amplifier.) The active low-pass section, which feeds the subwoofer amplifier, is continuously variable from 40 to 400Hz and provides a cut-off rate of 18dB per octave. This steep slope is achieved through a non-ringing, staggered arrangement of 6-12-18 dB/octave slopes, preserving bass transients. Distortion is exceptionally low, measuring 0.005% THD. Of particular importance in a device of this type is the performance of the high pass section which feeds the main power amplifier. Any distortion introduced in this stage will noticeably degrade the important middle and upper frequencies. In order to avoid such degradation, the high pass section of the LP1 is purely passive. Distortion is unmeasureable by normal techniques. If it were possible to measure the THD of the LP1’s high-pass section, we would expect a figure like 0.000001% Since the high-pass section is passive, it may be necessary, depending on the desired crossover frequency and the main amplifier’s input impedance, to insert a capacitor or resistor into the terminals provided on the LP1’s printed circuit board. Dahlquist designed this to be simple enough for the average consumer to do himself. The high-pass section can be set for any frequency from 40 to 400Hz; its slope is 6dB/octave. This combination of active and passive circuitry insures the sharp cut-off and ‘’tuneability’’ required to best integrate a subwoofer into a loudspeaker system, while not degrading main speaker performance.

The popularity of the LP1 was not only great among DQ-10 owner’s but audiophiles and professional audio engineers wishing to bi-amplify any speaker system. In the 80’s the Absolute Sound published an article about a modification that further improved the LP1’s sonic performance.

Untested shows scratches and wear.

Dimensions (HxWxD)

Pick-Up Dates/Time:
Friday 4/9 & Saturday 4/10 9am to 2pm

Pick-Up Location:
Surprise, Greenway Rd & the 303 (exact address will be given after purchase is complete)

Local Delivery Charge
(Maricopa County Only)


Flat Shipping Rate
(Within Continental U.S.)

Shipping will be invoiced separately

Item number:


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Can I pick-up my purchased item?
Yes, you will be prompted to schedule a pick-up time at check out. It is important to pick a time within the time frame specified above. We usually only have a 2 day window 9am to 1:30pm.

Do you offer delivery?
Yes, we deliver items locally (within Maricopa County) for a fee. The fee is clearly stated on each listing page. If you purchased more than 1 item, we will discount shipping and send you a refund for the overage.

 I paid for local delivery, when should I expect to receive my items?
Typically, we deliver local items within the 2 day window of the sale dates. You should expect to receive your purchased item/s on either of those days from 11am to 7pm. We will update you with a narrower time frame on the day of delivery.

 Do you ship items to other states/countries?
We can ship many items to anywhere in the world. Each listing will contain a flat shipping price for shipment within the continental US. If the listing states N/A for shipping it is usually because it is too costly to ship in comparison to its price.

Do you offer refunds on purchased items?
No, Please read description & view pictures, no refunds will be given for any reason.

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