Description
4 independent filters in one seamless module
The WMD Quad Anti Aliasing Filter (QAAF) was conceptualized as the first expansion for the Phase Displacement Oscillator.
It is designed to eliminate aliasing and stair-step distortion from the Digital to Analog converters. We opted to make this a seperate module because it is useful by itself as well as coupled with the PDO.
- Our 4-pole filters
- Channel to Channel Freq +-0.5%
- Switched Capacitor Design
- Butterworth Response Curve
- CV Input
- Frequency Offset Knob
- Clock Input/Output
- Mix Output
- Low-Frequency Limit Jumper
- 4 HP
- Completely Analog
- Great for Pre & Post Filtering
PDO EXPANSION CONNECTION GUIDE
CV Input - This input is roughly calibrated to 1v/octave. It drives a vactrol that will cause the QAAF to open quickly and close slowly.
Freq Knob - This knob controls the cutoff directly or acts as a bias/level shift control for the CV input.
CLK - This jack serves as a clock input or output, directly controlling the filter's frequencies at a ratio of 100:1. A jumper on the back (lower jumper) selects it's mode. Jump for clock output, leave open for clock input.
Inputs 1-4 - Audio Inputs, these are normaled from the expansion header going to the PDO. This normal is broken by plugging into these jacks.
Outputs 1-4 - These jacks are for each channel's outut.
Mix - This output is a sum of each channel's filtered input.
Frequency Limit Jumper - This rear jumper (upper set of pins) will limit the low frequency cutoff to about 300Hz. This will stop the QAAF from producing aliasing noise itself as it's clock frequency will be limited to 30kHz. Jump for limiting, leave open to disable.
Specs:
- Power: +12V = 35mA; -12V = 35mA
- Size: 4HP
- Depth: 40mm.
- Every WMD product is warrantied for 12 months after purchase, but please contact us if you ever have problems. We will take care of you.
Refund Policy
Returns
Our policy lasts 30 days. If 30 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange.
To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.
Several types of goods are exempt from being returned. Perishable goods such as food, flowers, newspapers or magazines cannot be returned. We also do not accept products that are intimate or sanitary goods, hazardous materials, or flammable liquids or gases.
Additional non-returnable items:
Gift cards
Downloadable software products
Some health and personal care items
To complete your return, we require a receipt or proof of purchase.
Please do not send your purchase back to the manufacturer.
There are certain situations where only partial refunds are granted (if applicable)
Book with obvious signs of use
CD, DVD, VHS tape, software, video game, cassette tape, or vinyl record that has been opened
Any item not in its original condition, is damaged or missing parts for reasons not due to our error
Any item that is returned more than 30 days after delivery
Refunds (if applicable)
Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.
If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.
Late or missing refunds (if applicable)
If you haven’t received a refund yet, first check your bank account again.
Then contact your credit card company, it may take some time before your refund is officially posted.
Next contact your bank. There is often some processing time before a refund is posted.
If you’ve done all of this and you still have not received your refund yet, please contact us at alex@wmdevices.com.
Sale items (if applicable)
Only regular priced items may be refunded, unfortunately sale items cannot be refunded.
Exchanges (if applicable)
We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at alex@wmdevices.com and send your item to: 1145 W. Custer Pl., Unit A, Denver CO 80223
Gifts
If the item was marked as a gift when purchased and shipped directly to you, you’ll receive a gift credit for the value of your return. Once the returned item is received, a gift certificate will be mailed to you.
If the item wasn’t marked as a gift when purchased, or the gift giver had the order shipped to themselves to give to you later, we will send a refund to the gift giver and he will find out about your return.
Shipping
To return your product, you should mail your product to: 1145 W. Custer Pl., Unit A, Denver CO 80223
You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.
Depending on where you live, the time it may take for your exchanged product to reach you, may vary.
If you are shipping an item over $75, you should consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.