For example, if your driver is 28" above the floor you could place the speakers 28" from the side wall, 28" from the front wall and increase the boundary effect. JA used to include speaker measurements with and without grills and you might be surprised at how much difference some grills made.Ī brief starting point on speaker placement that could lead to boundary interactions is placing them at equal distances from as many boundaries as possible. You might also want to play around with measurements with and without the grills on. This can also be exagerated by utilizing the room boundaries to reenforce those frequencies. I have no way of knowing, but it is not uncommon for monitors to have a built-in rise in the upper bass to compensate for the lack of genuine low bass response. The hump in the bass may be a result of the room and speaker placement. I think these are the only loudspeakers Sansui put any effort into that came out with positive results. I got a pair in mint condition on Ebay for a steal. BTW, these Sansui SP2500 are really cool loudspeakers. Of course, I can't pick up any measurement below 25Hz and above 16kHz as described above, which is sort of pointless since it is a mid-fi system at best. Correct the coloration at the low frequency range with the Realistic custom cabinets and I should be good to go. Playing all four speaker results with the same spiking at 80 to 90 Hz. The Sansui SP2500 manages to get through the entire track without going below 60dB or spiking above 80dB. For the rest of the track the entire thing is between 60 and 80dB with 70dB as the midrange. I verified this by going through the individual frequency test tones to pinpoint what frequencies were the problem. Doing this I notice that I have a coloration problem between 80 and 90 Hz with the Realistic custom cabinets which spike up to 87dB. I just realized that calibrating a RS SPL meter or one of its knockoffs to 70dB on the meter using a pink noise track and then running a log sweep tone track (20 to 20k) and manage to keep the entire track within the setting of the meter should be good enough for this meter. The Sansui speakers are on endtables with the bottom of the cabinet approx.
The custom cabinets are on the floor approx. Listening position is a chaise longue with the back approx. The speakers are located along the short wall before entering the dining room area. I'll post on room specifications later but basically it is an average size livingroom that breaks at a 90 degree angle into the dining room and kitchen area.
I doubt the digital is programmed to compensate. I guess I will do that with the orginal and new measurements.
I will run again with new settings.Īlso, I didn't use any of the of adjustments per frequencies that are out there for the radio shack analog meter. I did use the C weighting but I used the fast response instead of slow. Would you comment on the size of your room and your speaker positioning? I think 24db swings in the mid band can be improved upon with speaker positioning. Also, consider using the "C" weighting and "slow" settings. I would suggest setting the meter at 80db 1k and placing it in your listening position. Given the SPL levels you are using for the measurements, I think you have way too much room interaction with your speakers. This is quite a spread in frequency response.