A couple of questions on my plan to use a true midrange driver in a design.
I picked up some PHL 1660 midrange drivers off of eBay to build a high efficiency design. My intent was a MTM arrangement with a high sensitivity tweeter. These will be crossed on the low end somewhere from 300-400 Hz. If I run the mids in parallel, their sensitivity will be 100 dB @ 1W.
Looking at the spec sheet for this driver, it indicates using an enclosure volume of 3L/driver. That is a pretty small volume, and I was wondering if making the internal volume larger than that would create any performance issues for the driver. My thoughts were going larger and using a fair amount of stuffing material behind the drivers in the hope that it will absorb the back wave and give me clearer mids. I do not intend to play this speaker at high SPLs. For me 95 dB is about as loud as I ever play my systems, and the average is likely closer to 85 dB. I’m building this speaker simply to see if the dynamics are better than what you get with a lower sensitivity speaker. It’s basically an experiment to see for myself what the high sensitivity crowd likes so much. It also gives me an Avenue to try some low powered tube amps down the road.
The other question is in regard to Zmin. I didn’t consider this initially when I bought the drivers, but a later review of the spec sheet revealed that Zmin is 5.8 ohms at 650 Hz. With two drivers wired in parallel, is this potentially a problem for my Adcom amp considering that it will be delivering like 1W at my typical listening levels?
Other details are that the crossover will initially be a miniDSP, and the tweeter has a sensitivity of 96 dB. I want to adjust driver output levels with either the DSP or with the amp gain potentiometers.
Thanks in advance.
I picked up some PHL 1660 midrange drivers off of eBay to build a high efficiency design. My intent was a MTM arrangement with a high sensitivity tweeter. These will be crossed on the low end somewhere from 300-400 Hz. If I run the mids in parallel, their sensitivity will be 100 dB @ 1W.
Looking at the spec sheet for this driver, it indicates using an enclosure volume of 3L/driver. That is a pretty small volume, and I was wondering if making the internal volume larger than that would create any performance issues for the driver. My thoughts were going larger and using a fair amount of stuffing material behind the drivers in the hope that it will absorb the back wave and give me clearer mids. I do not intend to play this speaker at high SPLs. For me 95 dB is about as loud as I ever play my systems, and the average is likely closer to 85 dB. I’m building this speaker simply to see if the dynamics are better than what you get with a lower sensitivity speaker. It’s basically an experiment to see for myself what the high sensitivity crowd likes so much. It also gives me an Avenue to try some low powered tube amps down the road.
The other question is in regard to Zmin. I didn’t consider this initially when I bought the drivers, but a later review of the spec sheet revealed that Zmin is 5.8 ohms at 650 Hz. With two drivers wired in parallel, is this potentially a problem for my Adcom amp considering that it will be delivering like 1W at my typical listening levels?
Other details are that the crossover will initially be a miniDSP, and the tweeter has a sensitivity of 96 dB. I want to adjust driver output levels with either the DSP or with the amp gain potentiometers.
Thanks in advance.
