I decided that I've made enough progress to start a speaker thread. I'm nearly done with my two diy four channel amplifiers, and I recently purchased a DCX 2496. I have two sealed 2 cubic foot bass bins with 2x RS265HF each. I have two sealed PE 0.5 cubic feet enclosures with a ScanSpeak 18W4531G and Peerless HDS tweeter. By the way, I love 4 pole speak on connectors, they really clean up my system.
The boxes are not damped yet, but I have some polyfill and acoustic foam for the bass bins and bookshelves. The rationale here is that I think I don't need to resort to fiberglass in a sealed enclosure. The subwoofers are divided internally into one cubic foot sections, I have not installed additional bracing but I think I will be putting in bracing like Zaph did in his RS315 sub build.
My current crossover points are 140 and 1700 Hz LR4, I tried to make it LR4 acoustic with combinations of shelving and butterworths based upon The Edge, Zaph, and MarkK but I need to spend some time measuring. Sub is LT'ed to -3dB at 30Hz, -6dB at 24Hz.
I have not done any far field measurements yet, and have only done limited distortion measurements. One thing I learned is that distortion measurements in box and with the driver free on the carpet can differ a bit.
I will be posting some pictures later today. Hopefully I will get some linear and non-linear distortion measurements in the coming weeks and I will be posting them.
Currently I am considering that the duel ten inch woofers may allow me to get away with a 5.25" mid for either improved polar response or less tweeter loading. I don't know if anyone has any suggestions for a mid, I'd prefer that it is paper and 4 ohm nominal (or high sensitivity 8 ohm). Some replacements I have in mind are Peerless Exclusive, or SS 15M4531K, I really can't afford to spend more than 200 a piece.
Here's a near field graph of the RS265HF.
The boxes are not damped yet, but I have some polyfill and acoustic foam for the bass bins and bookshelves. The rationale here is that I think I don't need to resort to fiberglass in a sealed enclosure. The subwoofers are divided internally into one cubic foot sections, I have not installed additional bracing but I think I will be putting in bracing like Zaph did in his RS315 sub build.
My current crossover points are 140 and 1700 Hz LR4, I tried to make it LR4 acoustic with combinations of shelving and butterworths based upon The Edge, Zaph, and MarkK but I need to spend some time measuring. Sub is LT'ed to -3dB at 30Hz, -6dB at 24Hz.
I have not done any far field measurements yet, and have only done limited distortion measurements. One thing I learned is that distortion measurements in box and with the driver free on the carpet can differ a bit.
I will be posting some pictures later today. Hopefully I will get some linear and non-linear distortion measurements in the coming weeks and I will be posting them.
Currently I am considering that the duel ten inch woofers may allow me to get away with a 5.25" mid for either improved polar response or less tweeter loading. I don't know if anyone has any suggestions for a mid, I'd prefer that it is paper and 4 ohm nominal (or high sensitivity 8 ohm). Some replacements I have in mind are Peerless Exclusive, or SS 15M4531K, I really can't afford to spend more than 200 a piece.
Here's a near field graph of the RS265HF.
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